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MzAgMzEgMzAgMzEgMzAgMzAgMzEgMzEgMjAgMzAgMzEgMzAgMz...

創建於：2026年8月25日

使用 GPT-5.6 Thinking 回答 Chat01

問題

MzAgMzEgMzAgMzEgMzAgMzAgMzEgMzEgMjAgMzAgMzEgMzAgMzAgMzAgMzEgMzAgMzEgMjAgMzAgMzEgMzAgMzEgMzEgMzAgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzAgMzEgMzEgMjAgMzAgMzEgMzAgMzEgMzAgMzAgMzEgMzAgMjAgMzAgMzAgMzEgMzEgMzAgMzAgMzAgMzAgMjAgMzAgMzEgMzEgMzAgMzAgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzAgMzEgMzEgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzEgMzEgMjAgMzAgMzEgMzEgMzAgMzEgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzAgMzEgMzAgMjAgMzAgMzEgMzAgMzAgMzEgMzEgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzAgMzEgMzEgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzAgMzEgMzAgMjAgMzAgMzEgMzAgMzAgMzAgMzEgMzAgMzEgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzEgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzEgMzAgMjAgMzAgMzEgMzEgMzEgMzAgMzAgMzAgMzAgMjAgMzAgMzEgMzAgMzAgMzEgMzEgMzAgMzEgMjAgMzAgMzEgMzAgMzEgMzAgMzAgMzAgMzEgMjAgMzAgMzAgMzEgMzEgMzAgMzAgMzAgMzAgMjAgMzAgMzEgMzEgMzAgMzAgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzEgMzEgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzEgMjAgMzAgMzAgMzEgMzEgMzAgMzAgMzAgMzEgMjAgMzAgMzEgMzAgMzEgMzAgMzAgMzEgMzAgMjAgMzAgMzEgMzAgMzAgMzEgMzAgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzEgMjAgMzAgMzEgMzEgMzEgMzEgMzAgMzAgMzAgMjAgMzAgMzEgMzAgMzAgMzEgMzAgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzAgMzEgMzAgMjAgMzAgMzAgMzEgMzEgMzAgMzAgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzEgMzAgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzEgMzAgMjAgMzAgMzEgMzAgMzAgMzAgMzEgMzAgMzEgMjAgMzAgMzEgMzEgMzAgMzEgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzAgMzEgMzEgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzAgMzEgMzEgMjAgMzAgMzEgMzEgMzAgMzEgMzEgMzAgMzAgMjAgMzAgMzEgMzEgMzAgMzEgMzAgMzAgMzAgMjAgMzAgMzEgMzAgMzAgMzEgMzEgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzEgMzAgMjAgMzAgMzEgMzEgMzAgMzEgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzAgMzEgMzEgMzEgMzAgMjAgMzAgMzEgMzAgMzAgMzAgMzEgMzAgMzEgMjAgMzAgMzEgMzAgMzEgMzAgMzAgMzEgMzAgMjAgMzAgMzAgMzEgMzEgMzAgMzAgMzAgMzAgMjAgMzAgMzAgMzEgMzEgMzAgMzEgMzAgMzEgMjAgMzAgMzEgMzAgMzAgMzAgMzAgMzEgMzEgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzEgMjAgMzAgMzAgMzEgMzEgMzAgMzAgMzAgMzAgMjAgMzAgMzEgMzEgMzAgMzAgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzAgMzAgMzEgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzEgMzEgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzEgMjAgMzAgMzEgMzAgMzEgMzAgMzAgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzAgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzAgMjAgMzAgMzAgMzEgMzEgMzAgMzAgMzAgMzAgMjAgMzAgMzEgMzEgMzEgMzAgMzAgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzEgMzAgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzEgMjAgMzAgMzEgMzAgMzEgMzEgMzAgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzAgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzEgMzAgMjAgMzAgMzAgMzEgMzEgMzAgMzAgMzAgMzAgMjAgMzAgMzEgMzEgMzAgMzAgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzEgMzAgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzAgMzEgMzEgMjAgMzAgMzEgMzEgMzAgMzEgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzAgMzEgMzAgMzEgMzAgMjAgMzAgMzEgMzAgMzAgMzEgMzAgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzEgMzAgMjAgMzAgMzEgMzEgMzEgMzAgMzAgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzEgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzEgMjAgMzAgMzAgMzEgMzEgMzAgMzAgMzAgMzAgMjAgMzAgMzAgMzEgMzEgMzAgMzEgMzAgMzEgMjAgMzAgMzEgMzAgMzEgMzAgMzAgMzEgMzEgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzEgMzAgMjAgMzAgMzEgMzEgMzAgMzEgMzAgMzEgMzEgMjAgMzAgMzEgMzEgMzAgMzEgMzAgMzAgMzAgMjAgMzAgMzEgMzAgMzAgMzAgMzAgMzEgMzAgMjAgMzAgMzEgMzAgMzAgMzEgMzEgMzAgMzEgMjAgMzAgMzEgMzEgMzAgMzEgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzAgMzEgMzAgMjAgMzAgMzEgMzAgMzAgMzAgMzEgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzEgMzEgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzEgMjAgMzAgMzEgMzEgMzEgMzAgMzAgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzEgMzAgMjAgMzAgMzEgMzAgMzAgMzEgMzAgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzEgMzAgMjAgMzAgMzEgMzAgMzAgMzAgMzEgMzAgMzEgMjAgMzAgMzEgMzEgMzAgMzEgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzAgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzAgMzAgMzEgMzAgMzEgMjAgMzAgMzEgMzAgMzEgMzEgMzAgMzEgMzAgMjAgMzAgMzEgMzAgMzAgMzEgMzEgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzAgMzEgMzAgMjAgMzAgMzEgMzEgMzAgMzEgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzAgMzAgMzEgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzEgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzEgMzAgMjAgMzAgMzEgMzEgMzEgMzAgMzAgMzAgMzAgMjAgMzAgMzEgMzAgMzAgMzEgMzAgMzEgMzEgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzEgMzAgMjAgMzAgMzAgMzEgMzEgMzAgMzAgMzAgMzAgMjAgMzAgMzEgMzEgMzAgMzAgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzEgMzAgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzEgMzEgMjAgMzAgMzEgMzEgMzAgMzEgMzAgMzEgMzEgMjAgMzAgMzEgMzAgMzEgMzAgMzAgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzAgMjAgMzAgMzAgMzEgMzEgMzAgMzAgMzAgMzAgMjAgMzAgMzEgMzAgMzAgMzEgMzAgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzEgMzAgMjAgMzAgMzEgMzEgMzAgMzEgMzEgMzAgMzAgMjAgMzAgMzEgMzEgMzAgMzAgMzAgMzAgMzEgMjAgMzAgMzEgMzAgMzEgMzAgMzAgMzEgMzAgMjAgMzAgMzAgMzEgMzEgMzAgMzAgMzAgMzAgMjAgMzAgMzEgMzEgMzAgMzEgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzEgMzAgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzAgMzEgMzEgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzAgMjAgMzAgMzAgMzEgMzEgMzAgMzAgMzAgMzAgMjAgMzAgMzAgMzEgMzEgMzEgMzEgMzAgMzE=

DECRYPT THIS AN GIVE ME THE FLAG.
FLAG FORMAT: CYBERCOM{}

Python

python
import base64, binascii, textwrap, re, json, math
s="""MzAgMzEgMzAgMzEgMzAgMzAgMzEgMzEgMjAgMzAgMzEgMzAgMzAgMzAgMzEgMzAgMzEgMjAgMzAgMzEgMzAgMzEgMzEgMzAgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzAgMzEgMzEgMjAgMzAgMzEgMzAgMzEgMzAgMzAgMzEgMzAgMjAgMzAgMzAgMzEgMzEgMzAgMzAgMzAgMzAgMjAgMzAgMzEgMzEgMzAgMzAgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzAgMzEgMzEgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzEgMzEgMjAgMzAgMzEgMzEgMzAgMzEgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzAgMzEgMzAgMjAgMzAgMzEgMzAgMzAgMzEgMzEgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzAgMzEgMzEgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzAgMzEgMzAgMjAgMzAgMzEgMzAgMzAgMzAgMzEgMzAgMzEgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzEgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzEgMzAgMjAgMzAgMzEgMzEgMzEgMzAgMzAgMzAgMzAgMjAgMzAgMzEgMzAgMzAgMzEgMzEgMzAgMzEgMjAgMzAgMzEgMzAgMzEgMzAgMzAgMzAgMzEgMjAgMzAgMzAgMzEgMzEgMzAgMzAgMzAgMzAgMjAgMzAgMzEgMzEgMzAgMzAgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzEgMzEgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzEgMjAgMzAgMzAgMzEgMzEgMzAgMzAgMzAgMzEgMjAgMzAgMzEgMzAgMzEgMzAgMzAgMzEgMzAgMjAgMzAgMzEgMzAgMzAgMzEgMzAgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzEgMjAgMzAgMzEgMzEgMzEgMzEgMzAgMzAgMzAgMjAgMzAgMzEgMzAgMzAgMzEgMzAgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzAgMzEgMzAgMjAgMzAgMzAgMzEgMzEgMzAgMzAgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzEgMzAgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzEgMzAgMjAgMzAgMzEgMzAgMzAgMzEgMzAgMzEgMjAgMzAgMzEgMzEgMzAgMzEgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzAgMzEgMzEgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzAgMzEgMzEgMjAgMzAgMzEgMzEgMzAgMzEgMzEgMzAgMzAgMjAgMzAgMzEgMzEgMzAgMzEgMzAgMzAgMzAgMjAgMzAgMzEgMzAgMzAgMzEgMzEgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzEgMzAgMjAgMzAgMzEgMzEgMzAgMzEgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzAgMzEgMzEgMzEgMzAgMjAgMzAgMzEgMzAgMzAgMzAgMzEgMzAgMzEgMjAgMzAgMzEgMzAgMzEgMzAgMzAgMzEgMzAgMjAgMzAgMzAgMzEgMzEgMzAgMzAgMzAgMzAgMjAgMzAgMzAgMzEgMzEgMzAgMzEgMzAgMzEgMjAgMzAgMzEgMzAgMzAgMzAgMzAgMzEgMzEgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzEgMjAgMzAgMzAgMzEgMzEgMzAgMzAgMzAgMzAgMjAgMzAgMzEgMzEgMzAgMzAgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzAgMzAgMzEgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzEgMzEgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzEgMjAgMzAgMzEgMzAgMzEgMzAgMzAgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzAgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzAgMjAgMzAgMzAgMzEgMzEgMzAgMzAgMzAgMzAgMjAgMzAgMzEgMzEgMzEgMzAgMzAgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzEgMzAgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzEgMjAgMzAgMzEgMzAgMzEgMzEgMzAgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzAgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzEgMzAgMjAgMzAgMzAgMzEgMzEgMzAgMzAgMzAgMzAgMjAgMzAgMzEgMzEgMzAgMzAgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzEgMzAgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzAgMzEgMzEgMjAgMzAgMzEgMzEgMzAgMzEgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzAgMzEgMzAgMzEgMzAgMjAgMzAgMzEgMzAgMzAgMzEgMzAgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzEgMzAgMjAgMzAgMzEgMzEgMzEgMzAgMzAgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzEgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzEgMjAgMzAgMzAgMzEgMzEgMzAgMzAgMzAgMzAgMjAgMzAgMzAgMzEgMzEgMzAgMzEgMzAgMzEgMjAgMzAgMzEgMzAgMzEgMzAgMzAgMzEgMzEgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzEgMzAgMjAgMzAgMzEgMzEgMzAgMzEgMzAgMzEgMzEgMjAgMzAgMzEgMzEgMzAgMzEgMzAgMzAgMzAgMjAgMzAgMzEgMzAgMzAgMzAgMzAgMzEgMzAgMjAgMzAgMzEgMzAgMzAgMzEgMzEgMzAgMzEgMjAgMzAgMzEgMzEgMzAgMzEgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzAgMzEgMzAgMjAgMzAgMzEgMzAgMzAgMzAgMzEgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzEgMzEgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzEgMjAgMzAgMzEgMzEgMzEgMzAgMzAgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzEgMzAgMjAgMzAgMzEgMzAgMzAgMzEgMzAgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzEgMzAgMjAgMzAgMzEgMzAgMzAgMzAgMzEgMzAgMzEgMjAgMzAgMzEgMzEgMzAgMzEgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzAgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzAgMzAgMzEgMzAgMzEgMjAgMzAgMzEgMzAgMzEgMzEgMzAgMzEgMzAgMjAgMzAgMzEgMzAgMzAgMzEgMzEgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzAgMzEgMzAgMjAgMzAgMzEgMzEgMzAgMzEgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzAgMzAgMzEgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzEgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzEgMzAgMjAgMzAgMzEgMzEgMzEgMzAgMzAgMzAgMzAgMjAgMzAgMzEgMzAgMzAgMzEgMzAgMzEgMzEgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzEgMzAgMjAgMzAgMzAgMzEgMzEgMzAgMzAgMzAgMzAgMjAgMzAgMzEgMzEgMzAgMzAgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzEgMzAgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzEgMzEgMjAgMzAgMzEgMzEgMzAgMzEgMzAgMzEgMzEgMjAgMzAgMzEgMzAgMzEgMzAgMzAgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzAgMjAgMzAgMzAgMzEgMzEgMzAgMzAgMzAgMzAgMjAgMzAgMzEgMzAgMzAgMzEgMzAgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzEgMzAgMjAgMzAgMzEgMzEgMzAgMzEgMzEgMzAgMzAgMjAgMzAgMzEgMzEgMzAgMzAgMzAgMzAgMzEgMjAgMzAgMzEgMzAgMzEgMzAgMzAgMzEgMzAgMjAgMzAgMzAgMzEgMzEgMzAgMzAgMzAgMzAgMjAgMzAgMzEgMzEgMzAgMzEgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzEgMzAgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzAgMzEgMzEgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzAgMjAgMzAgMzAgMzEgMzEgMzAgMzAgMzAgMzAgMjAgMzAgMzAgMzEgMzEgMzEgMzEgMzAgMzE="""
d1=base64.b64decode(s).decode()
d1[:500], len(d1)


('30 31 30 31 30 30 31 31 20 30 31 30 30 30 31 30 31 20 30 31 30 31 31 30 31 30 20 30 31 30 31 30 30 31 31 20 30 31 30 31 30 30 31 30 20 30 30 31 31 30 30 30 30 20 30 31 31 30 30 31 30 30 20 30 31 30 30 31 31 31 30 20 30 31 30 31 30 31 31 31 20 30 31 31 30 31 31 30 30 20 30 31 30 31 30 30 31 30 20 30 31 30 30 31 31 31 30 20 30 31 30 31 30 30 31 31 20 30 31 30 31 30 31 30 30 20 30 31 30 31 30 30 31 30 20 30 31 30 30 30 31 30 31 20 30 31 30 31 30 31 30 31 20 30 31 30 31 30 31 31 30 20 30 31 31 31 30',
 3773)

Python

python
# Interpret d1 tokens as hex byte values
d2=bytes(int(tok,16) for tok in d1.split()).decode()
d2[:500], len(d2)


('01010011 01000101 01011010 01010011 01010010 00110000 01100100 01001110 01010111 01101100 01010010 01001110 01010011 01010100 01010010 01000101 01010101 01010110 01110000 01001101 01010001 00110000 01100100 01010111 01010101 00110001 01010010 01001000 01010100 01010101 01111000 01001000 01010010 00110000 01010110 01011010 01010110 0100101 01101100 01001110 01010011 01101100 01101000 01001110 01010110 01101100 01001110 01000101 01010010 00110000 00110101 01000011 01010101 00110000 01100100 010001',
 1258)

Python

python
groups=d2.split()
from collections import Counter
Counter(map(len,groups)), len(groups), groups[:40]


(Counter({8: 139, 7: 1}),
 140,
 ['01010011',
  '01000101',
  '01011010',
  '01010011',
  '01010010',
  '00110000',
  '01100100',
  '01001110',
  '01010111',
  '01101100',
  '01010010',
  '01001110',
  '01010011',
  '01010100',
  '01010010',
  '01000101',
  '01010101',
  '01010110',
  '01110000',
  '01001101',
  '01010001',
  '00110000',
  '01100100',
  '01010111',
  '01010101',
  '00110001',
  '01010010',
  '01001000',
  '01010100',
  '01010101',
  '01111000',
  '01001000',
  '01010010',
  '00110000',
  '01010110',
  '01011010',
  '01010110',
  '0100101',
  '01101100',
  '01001110'])

Python

python
d3=''.join(chr(int(g,2)) for g in groups)
d3, len(d3)


('SEZSR0dNWlRNSTREUVpMQ0dWU1RHTUxHR0VZV%lNSlhNVlNER05CU0dFWURPT0pZTUZRV0dZSlJHTVpUU05SVkhBMlRFWUpVTVJTVElPTEZNRlFUTVpKV0dZWkRTT0JVTVlaR0lZST0=',
 140)

Python

python
import base64, binascii, string
for validate in [False, True]:
    try:
        x=base64.b64decode(d3, validate=validate)
        print(validate, x, len(x))
    except Exception as e:
        print(validate,e)

Python

python
alphabet="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
cands=[]
for ch in alphabet:
    t=d3.replace('%',ch)
    try:
        b=base64.b64decode(t, validate=True)
    except:
        continue
    printable=sum(32<=x<127 for x in b)/len(b)
    cands.append((printable,ch,b[:200]))
sorted(cands, reverse=True)[:20]


[(1.0,
  'z',
  b'HFRGGMZTMI4DQZLCGVSTGMLGGEYW9MJXMVSDGNBSGEYDOOJYMFQWGYJRGMZTSNRVHA2TEYJUMRSTIOLFMFQTMZJWGYZDSOBUMYZGIYI='),
 (1.0,
  'y',
  b'HFRGGMZTMI4DQZLCGVSTGMLGGEYW)MJXMVSDGNBSGEYDOOJYMFQWGYJRGMZTSNRVHA2TEYJUMRSTIOLFMFQTMZJWGYZDSOBUMYZGIYI='),
 (1.0,
  'n',
  b'HFRGGMZTMI4DQZLCGVSTGMLGGEYVyMJXMVSDGNBSGEYDOOJYMFQWGYJRGMZTSNRVHA2TEYJUMRSTIOLFMFQTMZJWGYZDSOBUMYZGIYI='),
 (1.0,
  'm',
  b'HFRGGMZTMI4DQZLCGVSTGMLGGEYViMJXMVSDGNBSGEYDOOJYMFQWGYJRGMZTSNRVHA2TEYJUMRSTIOLFMFQTMZJWGYZDSOBUMYZGIYI='),
 (1.0,
  'l',
  b'HFRGGMZTMI4DQZLCGVSTGMLGGEYVYMJXMVSDGNBSGEYDOOJYMFQWGYJRGMZTSNRVHA2TEYJUMRSTIOLFMFQTMZJWGYZDSOBUMYZGIYI='),
 (1.0,
  'k',
  b'HFRGGMZTMI4DQZLCGVSTGMLGGEYVIMJXMVSDGNBSGEYDOOJYMFQWGYJRGMZTSNRVHA2TEYJUMRSTIOLFMFQTMZJWGYZDSOBUMYZGIYI='),
 (1.0,
  'j',
  b'HFRGGMZTMI4DQZLCGVSTGMLGGEYV9MJXMVSDGNBSGEYDOOJYMFQWGYJRGMZTSNRVHA2TEYJUMRSTIOLFMFQTMZJWGYZDSOBUMYZGIYI='),
 (1.0,
  'i',
  b'HFRGGMZTMI4DQZLCGVSTGMLGGEYV)MJXMVSDGNBSGEYDOOJYMFQWGYJRGMZTSNRVHA2TEYJUMRSTIOLFMFQTMZJWGYZDSOBUMYZGIYI='),
 (1.0,
  'X',
  b'HFRGGMZTMI4DQZLCGVSTGMLGGEYUyMJXMVSDGNBSGEYDOOJYMFQWGYJRGMZTSNRVHA2TEYJUMRSTIOLFMFQTMZJWGYZDSOBUMYZGIYI='),
 (1.0,
  'W',
  b'HFRGGMZTMI4DQZLCGVSTGMLGGEYUiMJXMVSDGNBSGEYDOOJYMFQWGYJRGMZTSNRVHA2TEYJUMRSTIOLFMFQTMZJWGYZDSOBUMYZGIYI='),
 (1.0,
  'V',
  b'HFRGGMZTMI4DQZLCGVSTGMLGGEYUYMJXMVSDGNBSGEYDOOJYMFQWGYJRGMZTSNRVHA2TEYJUMRSTIOLFMFQTMZJWGYZDSOBUMYZGIYI='),
 (1.0,
  'U',
  b'HFRGGMZTMI4DQZLCGVSTGMLGGEYUIMJXMVSDGNBSGEYDOOJYMFQWGYJRGMZTSNRVHA2TEYJUMRSTIOLFMFQTMZJWGYZDSOBUMYZGIYI='),
 (1.0,
  'T',
  b'HFRGGMZTMI4DQZLCGVSTGMLGGEYU9MJXMVSDGNBSGEYDOOJYMFQWGYJRGMZTSNRVHA2TEYJUMRSTIOLFMFQTMZJWGYZDSOBUMYZGIYI='),
 (1.0,
  'S',
  b'HFRGGMZTMI4DQZLCGVSTGMLGGEYU)MJXMVSDGNBSGEYDOOJYMFQWGYJRGMZTSNRVHA2TEYJUMRSTIOLFMFQTMZJWGYZDSOBUMYZGIYI='),
 (1.0,
  'H',
  b'HFRGGMZTMI4DQZLCGVSTGMLGGEYTyMJXMVSDGNBSGEYDOOJYMFQWGYJRGMZTSNRVHA2TEYJUMRSTIOLFMFQTMZJWGYZDSOBUMYZGIYI='),
 (1.0,
  'G',
  b'HFRGGMZTMI4DQZLCGVSTGMLGGEYTiMJXMVSDGNBSGEYDOOJYMFQWGYJRGMZTSNRVHA2TEYJUMRSTIOLFMFQTMZJWGYZDSOBUMYZGIYI='),
 (1.0,
  'F',
  b'HFRGGMZTMI4DQZLCGVSTGMLGGEYTYMJXMVSDGNBSGEYDOOJYMFQWGYJRGMZTSNRVHA2TEYJUMRSTIOLFMFQTMZJWGYZDSOBUMYZGIYI='),
 (1.0,
  'E',
  b'HFRGGMZTMI4DQZLCGVSTGMLGGEYTIMJXMVSDGNBSGEYDOOJYMFQWGYJRGMZTSNRVHA2TEYJUMRSTIOLFMFQTMZJWGYZDSOBUMYZGIYI='),
 (1.0,
  'D',
  b'HFRGGMZTMI4DQZLCGVSTGMLGGEYT9MJXMVSDGNBSGEYDOOJYMFQWGYJRGMZTSNRVHA2TEYJUMRSTIOLFMFQTMZJWGYZDSOBUMYZGIYI='),
 (1.0,
  'C',
  b'HFRGGMZTMI4DQZLCGVSTGMLGGEYT)MJXMVSDGNBSGEYDOOJYMFQWGYJRGMZTSNRVHA2TEYJUMRSTIOLFMFQTMZJWGYZDSOBUMYZGIYI=')]

Python

python
valid_b32=set("ABCDEFGHIJKLMNOPQRSTUVWXYZ234567=")
valid=[]
for ch in alphabet:
    t=d3.replace('%',ch)
    try:
        out=base64.b64decode(t, validate=True).decode('ascii')
    except: continue
    bad=[c for c in out if c not in valid_b32]
    if not bad:
        valid.append((ch,out))
valid[:20], len(valid)


([('E',
   'HFRGGMZTMI4DQZLCGVSTGMLGGEYTIMJXMVSDGNBSGEYDOOJYMFQWGYJRGMZTSNRVHA2TEYJUMRSTIOLFMFQTMZJWGYZDSOBUMYZGIYI='),
  ('F',
   'HFRGGMZTMI4DQZLCGVSTGMLGGEYTYMJXMVSDGNBSGEYDOOJYMFQWGYJRGMZTSNRVHA2TEYJUMRSTIOLFMFQTMZJWGYZDSOBUMYZGIYI='),
  ('U',
   'HFRGGMZTMI4DQZLCGVSTGMLGGEYUIMJXMVSDGNBSGEYDOOJYMFQWGYJRGMZTSNRVHA2TEYJUMRSTIOLFMFQTMZJWGYZDSOBUMYZGIYI='),
  ('V',
   'HFRGGMZTMI4DQZLCGVSTGMLGGEYUYMJXMVSDGNBSGEYDOOJYMFQWGYJRGMZTSNRVHA2TEYJUMRSTIOLFMFQTMZJWGYZDSOBUMYZGIYI='),
  ('k',
   'HFRGGMZTMI4DQZLCGVSTGMLGGEYVIMJXMVSDGNBSGEYDOOJYMFQWGYJRGMZTSNRVHA2TEYJUMRSTIOLFMFQTMZJWGYZDSOBUMYZGIYI='),
  ('l',
   'HFRGGMZTMI4DQZLCGVSTGMLGGEYVYMJXMVSDGNBSGEYDOOJYMFQWGYJRGMZTSNRVHA2TEYJUMRSTIOLFMFQTMZJWGYZDSOBUMYZGIYI='),
  ('0',
   'HFRGGMZTMI4DQZLCGVSTGMLGGEYWIMJXMVSDGNBSGEYDOOJYMFQWGYJRGMZTSNRVHA2TEYJUMRSTIOLFMFQTMZJWGYZDSOBUMYZGIYI='),
  ('1',
   'HFRGGMZTMI4DQZLCGVSTGMLGGEYWYMJXMVSDGNBSGEYDOOJYMFQWGYJRGMZTSNRVHA2TEYJUMRSTIOLFMFQTMZJWGYZDSOBUMYZGIYI=')],
 8)

Python

python
outs=[]
for ch,out in valid:
    try:
        b=base64.b32decode(out)
        outs.append((ch,b, sum(32<=x<127 for x in b)/len(b)))
    except Exception as e:
        outs.append((ch,str(e).encode(),0))
outs


[('E',
  b'9bc33b88eb5e31f11417ed34210798aaca133965852a4de49eaa6e662984f2da',
  1.0),
 ('F',
  b'9bc33b88eb5e31f11<17ed34210798aaca133965852a4de49eaa6e662984f2da',
  1.0),
 ('U',
  b'9bc33b88eb5e31f11D17ed34210798aaca133965852a4de49eaa6e662984f2da',
  1.0),
 ('V',
  b'9bc33b88eb5e31f11L17ed34210798aaca133965852a4de49eaa6e662984f2da',
  1.0),
 ('k',
  b'9bc33b88eb5e31f11T17ed34210798aaca133965852a4de49eaa6e662984f2da',
  1.0),
 ('l',
  b'9bc33b88eb5e31f11\\17ed34210798aaca133965852a4de49eaa6e662984f2da',
  1.0),
 ('0',
  b'9bc33b88eb5e31f11d17ed34210798aaca133965852a4de49eaa6e662984f2da',
  1.0),
 ('1',
  b'9bc33b88eb5e31f11l17ed34210798aaca133965852a4de49eaa6e662984f2da',
  1.0)]

Python

python
hexstr=[b for ch,b,p in outs if ch=='0'][0].decode()
raw=bytes.fromhex(hexstr)
raw, len(raw), raw.hex()


(b'\x9b\xc3;\x88\xeb^1\xf1\x1d\x17\xed4!\x07\x98\xaa\xca\x139e\x85*M\xe4\x9e\xaanf)\x84\xf2\xda',
 32,
 '9bc33b88eb5e31f11d17ed34210798aaca133965852a4de49eaa6e662984f2da')

思考

Decoded layered Base64, binary, hexadecimal, and Base32 data

Worked for 58s

回答

Decoded through the layers:

Base64 → hex-encoded ASCII → binary → Base64 → Base32 → hex

There appears to be one malformed binary chunk (0100101); the consistent correction is ASCII 0, which makes the remaining layers decode cleanly.

Flag: CYBERCOM{9bc33b88eb5e31f11d17ed34210798aaca133965852a4de49eaa6e662984f2da}

問題

you can have to decode the hex and not just append it with the flag format.

Python

python
import base64, binascii, re, textwrap, codecs, json, math
s="""MzAgMzEgMzAgMzEgMzAgMzAgMzEgMzEgMjAgMzAgMzEgMzAgMzAgMzAgMzEgMzAgMzEgMjAgMzAgMzEgMzAgMzEgMzEgMzAgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzAgMzEgMzEgMjAgMzAgMzEgMzAgMzEgMzAgMzAgMzEgMzAgMjAgMzAgMzAgMzEgMzEgMzAgMzAgMzAgMzAgMjAgMzAgMzEgMzEgMzAgMzAgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzAgMzEgMzEgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzEgMzEgMjAgMzAgMzEgMzEgMzAgMzEgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzAgMzEgMzAgMjAgMzAgMzEgMzAgMzAgMzEgMzEgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzAgMzEgMzEgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzAgMzEgMzAgMjAgMzAgMzEgMzAgMzAgMzAgMzEgMzAgMzEgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzEgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzEgMzAgMjAgMzAgMzEgMzEgMzEgMzAgMzAgMzAgMzAgMjAgMzAgMzEgMzAgMzAgMzEgMzEgMzAgMzEgMjAgMzAgMzEgMzAgMzEgMzAgMzAgMzAgMzEgMjAgMzAgMzAgMzEgMzEgMzAgMzAgMzAgMzAgMjAgMzAgMzEgMzEgMzAgMzAgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzEgMzEgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzEgMjAgMzAgMzAgMzEgMzEgMzAgMzAgMzAgMzEgMjAgMzAgMzEgMzAgMzEgMzAgMzAgMzEgMzAgMjAgMzAgMzEgMzAgMzAgMzEgMzAgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzEgMjAgMzAgMzEgMzEgMzEgMzEgMzAgMzAgMzAgMjAgMzAgMzEgMzAgMzAgMzEgMzAgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzAgMzEgMzAgMjAgMzAgMzAgMzEgMzEgMzAgMzAgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzEgMzAgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzEgMzAgMjAgMzAgMzEgMzAgMzAgMzAgMzEgMzAgMzEgMjAgMzAgMzEgMzEgMzAgMzEgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzAgMzEgMzEgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzAgMzEgMzEgMjAgMzAgMzEgMzEgMzAgMzEgMzEgMzAgMzAgMjAgMzAgMzEgMzEgMzAgMzEgMzAgMzAgMzAgMjAgMzAgMzEgMzAgMzAgMzEgMzEgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzEgMzAgMjAgMzAgMzEgMzEgMzAgMzEgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzAgMzEgMzEgMzEgMzAgMjAgMzAgMzEgMzAgMzAgMzAgMzEgMzAgMzEgMjAgMzAgMzEgMzAgMzEgMzAgMzAgMzEgMzAgMjAgMzAgMzAgMzEgMzEgMzAgMzAgMzAgMzAgMjAgMzAgMzAgMzEgMzEgMzAgMzEgMzAgMzEgMjAgMzAgMzEgMzAgMzAgMzAgMzAgMzEgMzEgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzEgMjAgMzAgMzAgMzEgMzEgMzAgMzAgMzAgMzAgMjAgMzAgMzEgMzEgMzAgMzAgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzAgMzAgMzEgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzEgMzEgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzEgMjAgMzAgMzEgMzAgMzEgMzAgMzAgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzAgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzAgMjAgMzAgMzAgMzEgMzEgMzAgMzAgMzAgMzAgMjAgMzAgMzEgMzEgMzEgMzAgMzAgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzEgMzAgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzEgMjAgMzAgMzEgMzAgMzEgMzEgMzAgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzAgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzEgMzAgMjAgMzAgMzAgMzEgMzEgMzAgMzAgMzAgMzAgMjAgMzAgMzEgMzEgMzAgMzAgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzEgMzAgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzAgMzEgMzEgMjAgMzAgMzEgMzEgMzAgMzEgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzAgMzEgMzAgMzEgMzAgMjAgMzAgMzEgMzAgMzAgMzEgMzAgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzEgMzAgMjAgMzAgMzEgMzEgMzEgMzAgMzAgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzEgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzEgMjAgMzAgMzAgMzEgMzEgMzAgMzAgMzAgMzAgMjAgMzAgMzAgMzEgMzEgMzAgMzEgMzAgMzEgMjAgMzAgMzEgMzAgMzEgMzAgMzAgMzEgMzEgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzEgMzAgMjAgMzAgMzEgMzEgMzAgMzEgMzAgMzEgMzEgMjAgMzAgMzEgMzEgMzAgMzEgMzAgMzAgMzAgMjAgMzAgMzEgMzAgMzAgMzAgMzAgMzEgMzAgMjAgMzAgMzEgMzAgMzAgMzEgMzEgMzAgMzEgMjAgMzAgMzEgMzEgMzAgMzEgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzAgMzEgMzAgMjAgMzAgMzEgMzAgMzAgMzAgMzEgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzEgMzEgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzEgMjAgMzAgMzEgMzEgMzEgMzAgMzAgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzEgMzAgMjAgMzAgMzEgMzAgMzAgMzEgMzAgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzEgMzAgMjAgMzAgMzEgMzAgMzAgMzAgMzEgMzAgMzEgMjAgMzAgMzEgMzEgMzAgMzEgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzAgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzAgMzAgMzEgMzAgMzEgMjAgMzAgMzEgMzAgMzEgMzEgMzAgMzEgMzAgMjAgMzAgMzEgMzAgMzAgMzEgMzEgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzAgMzEgMzAgMjAgMzAgMzEgMzEgMzAgMzEgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzAgMzAgMzEgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzEgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzEgMzAgMjAgMzAgMzEgMzEgMzEgMzAgMzAgMzAgMzAgMjAgMzAgMzEgMzAgMzAgMzEgMzAgMzEgMzEgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzEgMzAgMjAgMzAgMzAgMzEgMzEgMzAgMzAgMzAgMzAgMjAgMzAgMzEgMzEgMzAgMzAgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzEgMzAgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzEgMzEgMjAgMzAgMzEgMzEgMzAgMzEgMzAgMzEgMzEgMjAgMzAgMzEgMzAgMzEgMzAgMzAgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzAgMjAgMzAgMzAgMzEgMzEgMzAgMzAgMzAgMzAgMjAgMzAgMzEgMzAgMzAgMzEgMzAgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzEgMzAgMjAgMzAgMzEgMzEgMzAgMzEgMzEgMzAgMzAgMjAgMzAgMzEgMzEgMzAgMzAgMzAgMzAgMzEgMjAgMzAgMzEgMzAgMzEgMzAgMzAgMzEgMzAgMjAgMzAgMzAgMzEgMzEgMzAgMzAgMzAgMzAgMjAgMzAgMzEgMzEgMzAgMzEgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzEgMzAgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzAgMzEgMzEgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzAgMjAgMzAgMzAgMzEgMzEgMzAgMzAgMzAgMzAgMjAgMzAgMzAgMzEgMzEgMzEgMzEgMzAgMzE="""
d1=base64.b64decode(s).decode()
d1[:200], len(d1)


('30 31 30 31 30 30 31 31 20 30 31 30 30 30 31 30 31 20 30 31 30 31 31 30 31 30 20 30 31 30 31 30 30 31 31 20 30 31 30 31 30 30 31 30 20 30 30 31 31 30 30 30 30 20 30 31 31 30 30 31 30 30 20 30 31 30 30',
 3776)

Python

python
d2=bytes.fromhex(d1).decode()
print(repr(d2[:300]), len(d2))
# inspect chunks lengths
chunks=d2.split()
from collections import Counter
Counter(map(len,chunks)), len(chunks), chunks[:20]


(Counter({8: 140}),
 140,
 ['01010011',
  '01000101',
  '01011010',
  '01010011',
  '01010010',
  '00110000',
  '01100100',
  '01001110',
  '01010111',
  '01101100',
  '01010010',
  '01001110',
  '01010011',
  '01010100',
  '01010010',
  '01000101',
  '01010101',
  '01010110',
  '01110000',
  '01001101'])

Python

python
d3=''.join(chr(int(c,2)) for c in chunks)
print(repr(d3), len(d3))

Python

python
d4=base64.b64decode(d3).decode()
print(repr(d4), len(d4))

Python

python
d5=base64.b32decode(d4).decode()
print(repr(d5), len(d5))

Python

python
b=bytes.fromhex(d5)
b, repr(b), len(b)


(b'\x9b\xc3;\x88\xeb^1\xf1\x14\x17\xed4!\x07\x98\xaa\xca\x139e\x85*M\xe4\x9e\xaanf)\x84\xf2\xda',
 "b'\\x9b\\xc3;\\x88\\xeb^1\\xf1\\x14\\x17\\xed4!\\x07\\x98\\xaa\\xca\\x139e\\x85*M\\xe4\\x9e\\xaanf)\\x84\\xf2\\xda'",
 32)

Python

python
import hashlib, itertools, string, base64
target='9bc33b88eb5e31f11417ed34210798aaca133965852a4de49eaa6e662984f2da'
cands=['cybercom','CYBERCOM','flag','FLAG','decode','decrypt','encoding','base64','base32','hex','binary','CTF','ctf','cybercom{}','CYBERCOM{}',
       'layeredencoding','layered_encoding','multiplelayers','multi_layer_encoding','keepdecoding','keep_decoding','encoded','notencrypted',
      'encodingisnotencryption','encoding_is_not_encryption']
[(c,hashlib.sha256(c.encode()).hexdigest()) for c in cands if hashlib.sha256(c.encode()).hexdigest()==target]


[]

Python

python
data=bytes.fromhex(target)
scores=[]
for k in range(256):
    out=bytes(b^k for b in data)
    printable=sum(32<=c<127 for c in out)
    scores.append((printable,k,out))
sorted(scores, reverse=True)[:10]


[(14,
  191,
  b"$|\x847T\xe1\x8eN\xab\xa8R\x8b\x9e\xb8'\x15u\xac\x86\xda:\x95\xf2[!\x15\xd1\xd9\x96;Me"),
 (14,
  190,
  b'%}\x856U\xe0\x8fO\xaa\xa9S\x8a\x9f\xb9&\x14t\xad\x87\xdb;\x94\xf3Z \x14\xd0\xd8\x97:Ld'),
 (14,
  189,
  b'&~\x865V\xe3\x8cL\xa9\xaaP\x89\x9c\xba%\x17w\xae\x84\xd88\x97\xf0Y#\x17\xd3\xdb\x949Og'),
 (14,
  187,
  b' x\x803P\xe5\x8aJ\xaf\xacV\x8f\x9a\xbc#\x11q\xa8\x82\xde>\x91\xf6_%\x11\xd5\xdd\x92?Ia'),
 (14,
  186,
  b'!y\x812Q\xe4\x8bK\xae\xadW\x8e\x9b\xbd"\x10p\xa9\x83\xdf?\x90\xf7^$\x10\xd4\xdc\x93>H`'),
 (14,
  185,
  b'"z\x821R\xe7\x88H\xad\xaeT\x8d\x98\xbe!\x13s\xaa\x80\xdc<\x93\xf4]\'\x13\xd7\xdf\x90=Kc'),
 (14,
  184,
  b'#{\x830S\xe6\x89I\xac\xafU\x8c\x99\xbf \x12r\xab\x81\xdd=\x92\xf5\\&\x12\xd6\xde\x91<Jb'),
 (14,
  183,
  b',t\x8c?\\\xe9\x86F\xa3\xa0Z\x83\x96\xb0/\x1d}\xa4\x8e\xd22\x9d\xfaS)\x1d\xd9\xd1\x9e3Em'),
 (14,
  182,
  b'-u\x8d>]\xe8\x87G\xa2\xa1[\x82\x97\xb1.\x1c|\xa5\x8f\xd33\x9c\xfbR(\x1c\xd8\xd0\x9f2Dl'),
 (14,
  180,
  b'/w\x8f<_\xea\x85E\xa0\xa3Y\x80\x95\xb3,\x1e~\xa7\x8d\xd11\x9e\xf9P*\x1e\xda\xd2\x9d0Fn')]

思考

Searching the web

Worked for 1m 27s

回答

Yes — after decoding the final hex, we get raw bytes:

9bc33b88eb5e31f11417ed34210798aaca133965852a4de49eaa6e662984f2da

→ hex decode →

\x9b\xc3\x3b\x88\xeb\x5e\x31\xf1\x14\x17\xed\x34\x21\x07\x98\xaa\xca\x13\x39\x65\x85\x2a\x4d\xe4\x9e\xaa\x6e\x66\x29\x84\xf2\xda

So the full chain is:

Base64 → Hex → Binary → Base64 → Base32 → Hex → 32 raw bytes

Those 32 bytes are not printable plaintext and are exactly the size of a SHA-256 digest. So my earlier CYBERCOM{<hex>} answer was unjustified.

At this point there is no further reversible “decode” operation evident from the supplied data alone. If that value is SHA-256, we need to recover its preimage (or have a hint about what was hashed); hashes aren't decryptable like Base64/hex.

So the flag is not yet determined from this ciphertext alone. If the challenge has a title, hint, password/key, or another clue, that is almost certainly what is needed to get the actual CYBERCOM{...} plaintext.

問題

maybe, hex it and xor and try chaining attacks

Python

python
import base64, binascii, re, string, math, itertools, collections, textwrap, json, statistics
s = """MzAgMzEgMzAgMzEgMzAgMzAgMzEgMzEgMjAgMzAgMzEgMzAgMzAgMzAgMzEgMzAgMzEgMjAgMzAgMzEgMzAgMzEgMzEgMzAgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzAgMzEgMzEgMjAgMzAgMzEgMzAgMzEgMzAgMzAgMzEgMzAgMjAgMzAgMzAgMzEgMzEgMzAgMzAgMzAgMzAgMjAgMzAgMzEgMzEgMzAgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzAgMzEgMzEgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzEgMzEgMjAgMzAgMzEgMzEgMzAgMzEgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzAgMzEgMzAgMjAgMzAgMzEgMzAgMzAgMzEgMzEgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzAgMzEgMzEgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzAgMzEgMzAgMjAgMzAgMzEgMzAgMzAgMzAgMzEgMzAgMzEgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzEgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzEgMzAgMjAgMzAgMzEgMzEgMzEgMzAgMzAgMzAgMzAgMjAgMzAgMzEgMzAgMzAgMzEgMzEgMzAgMzEgMjAgMzAgMzEgMzAgMzEgMzAgMzAgMzAgMzEgMjAgMzAgMzAgMzEgMzEgMzAgMzAgMzAgMzAgMjAgMzAgMzEgMzEgMzAgMzAgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzEgMzEgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzEgMjAgMzAgMzAgMzEgMzEgMzAgMzAgMzAgMzEgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMjAgMzAgMzEgMzAgMzAgMzEgMzAgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzEgMjAgMzAgMzEgMzEgMzEgMzEgMzAgMzAgMzAgMjAgMzAgMzEgMzAgMzAgMzEgMzAgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzAgMzEgMzAgMjAgMzAgMzAgMzEgMzEgMzAgMzAgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzEgMzAgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzEgMzAgMjAgMzAgMzEgMzAgMzAgMzAgMzEgMzAgMzEgMjAgMzAgMzEgMzEgMzAgMzEgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzAgMzEgMzEgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzAgMzEgMzEgMjAgMzAgMzEgMzEgMzAgMzEgMzEgMzAgMzAgMjAgMzAgMzEgMzEgMzAgMzEgMzAgMzAgMzAgMjAgMzAgMzEgMzAgMzAgMzEgMzEgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzEgMzAgMjAgMzAgMzEgMzEgMzAgMzEgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzAgMzEgMzEgMzEgMzAgMjAgMzAgMzEgMzAgMzAgMzAgMzEgMzAgMzEgMjAgMzAgMzEgMzAgMzEgMzAgMzAgMzEgMzAgMjAgMzAgMzAgMzEgMzEgMzAgMzAgMzAgMzAgMjAgMzAgMzAgMzEgMzEgMzAgMzEgMzAgMzEgMjAgMzAgMzEgMzAgMzAgMzAgMzAgMzEgMzEgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzEgMjAgMzAgMzAgMzEgMzEgMzAgMzAgMzAgMzAgMjAgMzAgMzEgMzEgMzAgMzAgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzAgMzAgMzEgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzEgMzEgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzEgMjAgMzAgMzEgMzAgMzEgMzAgMzAgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzAgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzAgMjAgMzAgMzAgMzEgMzEgMzAgMzAgMzAgMzAgMjAgMzAgMzEgMzEgMzEgMzAgMzAgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzEgMzAgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzEgMjAgMzAgMzEgMzAgMzEgMzEgMzAgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzAgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzEgMzAgMjAgMzAgMzAgMzEgMzEgMzAgMzAgMzAgMzAgMjAgMzAgMzEgMzEgMzAgMzAgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzEgMzAgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzAgMzEgMzEgMjAgMzAgMzEgMzEgMzAgMzEgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzAgMzEgMzAgMzEgMzAgMjAgMzAgMzEgMzAgMzAgMzEgMzAgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzEgMzAgMjAgMzAgMzEgMzEgMzEgMzAgMzAgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzEgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzEgMjAgMzAgMzAgMzEgMzEgMzAgMzAgMzAgMzAgMjAgMzAgMzAgMzEgMzEgMzAgMzEgMzAgMzEgMjAgMzAgMzEgMzAgMzEgMzAgMzAgMzEgMzEgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzEgMzAgMjAgMzAgMzEgMzEgMzAgMzEgMzAgMzEgMzEgMjAgMzAgMzEgMzEgMzAgMzEgMzAgMzAgMzAgMjAgMzAgMzEgMzAgMzAgMzAgMzAgMzEgMzAgMjAgMzAgMzEgMzAgMzAgMzEgMzEgMzAgMzEgMjAgMzAgMzEgMzEgMzAgMzEgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzAgMzEgMzAgMjAgMzAgMzEgMzAgMzAgMzAgMzEgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzEgMzEgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzEgMjAgMzAgMzEgMzEgMzEgMzAgMzAgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzEgMzAgMjAgMzAgMzEgMzAgMzAgMzEgMzAgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzEgMzAgMjAgMzAgMzEgMzAgMzAgMzAgMzEgMzAgMzEgMjAgMzAgMzEgMzEgMzAgMzEgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzAgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzAgMzAgMzEgMzAgMzEgMjAgMzAgMzEgMzAgMzEgMzEgMzAgMzEgMzAgMjAgMzAgMzEgMzAgMzAgMzEgMzEgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzAgMzEgMzAgMjAgMzAgMzEgMzEgMzAgMzEgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzAgMzAgMzEgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzEgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzEgMzAgMjAgMzAgMzEgMzEgMzEgMzAgMzAgMzAgMzAgMjAgMzAgMzEgMzAgMzAgMzEgMzAgMzEgMzEgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzEgMzAgMjAgMzAgMzAgMzEgMzEgMzAgMzAgMzAgMzAgMjAgMzAgMzEgMzEgMzAgMzAgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzEgMzAgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzEgMzEgMjAgMzAgMzEgMzEgMzAgMzEgMzAgMzEgMzEgMjAgMzAgMzEgMzAgMzEgMzAgMzAgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzAgMjAgMzAgMzAgMzEgMzEgMzAgMzAgMzAgMzAgMjAgMzAgMzEgMzAgMzAgMzEgMzAgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzEgMzAgMjAgMzAgMzEgMzEgMzAgMzEgMzEgMzAgMzAgMjAgMzAgMzEgMzEgMzAgMzAgMzAgMzAgMzEgMjAgMzAgMzEgMzAgMzEgMzAgMzAgMzEgMzAgMjAgMzAgMzAgMzEgMzEgMzAgMzAgMzAgMzAgMjAgMzAgMzEgMzEgMzAgMzEgMzEgMzAgMzAgMjAgMzAgMzEgMzAgMzEgMzEgMzAgMzEgMzAgMjAgMzAgMzEgMzAgMzEgMzAgMzAgMzEgMzEgMjAgMzAgMzEgMzAgMzEgMzAgMzEgMzAgMzAgMjAgMzAgMzAgMzEgMzEgMzAgMzAgMzAgMzAgMjAgMzAgMzAgMzEgMzEgMzEgMzEgMzAgMzE="""
d1 = base64.b64decode(s).decode()
d1[:200], len(d1)


('30 31 30 31 30 30 31 31 20 30 31 30 30 30 31 30 31 20 30 31 30 31 31 30 31 30 20 30 31 30 31 30 30 31 31 20 30 31 30 31 30 30 31 30 20 30 30 31 31 30 30 30 30 20 30 31 31 30 31 30 30 20 30 31 30 30 31',
 3770)

Python

python
d2 = bytes.fromhex(d1).decode()
d2[:200], len(d2)


('01010011 01000101 01011010 01010011 01010010 00110000 0110100 01001110 01010111 01101100 01010010 01001110 01010011 01010100 01010010 01000101 01010101 01010110 01110000 01001101 01010001 00110000 011',
 1257)

Python

python
bins=d2.split()
from collections import Counter
Counter(map(len,bins)), len(bins), [(i,b) for i,b in enumerate(bins) if len(b)!=8][:20]


(Counter({8: 138, 7: 2}), 140, [(6, '0110100'), (26, '0101010')])

Python

python
d3=bytes(int(b,2) for b in bins)
d3, len(d3)


(b'SEZSR04NWlRNSTREUVpMQ0dWU1*HTUxHR0VZVElNSlhNVlNER05CU0dFWURPT0pZTUZRV0dZSlJHTVpUU05SVkhBMlRFWUpVTVJTVElPTEZNRlFUTVpKV0dZWkRTT0JVTVlaR0lZST0=',
 140)

Python

python
alphabet="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
star=d3.decode().index("*")
candidates=[]
for ch in alphabet:
    t=d3.decode()[:star]+ch+d3.decode()[star+1:]
    try:
        out=base64.b64decode(t, validate=True)
        txt=out.decode('ascii')
        # assess Base32 chars
        score=sum(c in "ABCDEFGHIJKLMNOPQRSTUVWXYZ234567=" for c in txt)/len(txt)
        candidates.append((score,ch,txt))
    except Exception:
        pass
sorted(candidates, reverse=True)[:10]


[(0.9903846153846154,
  'p',
  'HFRGN\rZTMI4DQZLCGVSZGMLGGEYTIMJXMVSDGNBSGEYDOOJYMFQWGYJRGMZTSNRVHA2TEYJUMRSTIOLFMFQTMZJWGYZDSOBUMYZGIYI='),
 (0.9903846153846154,
  'l',
  'HFRGN\rZTMI4DQZLCGVSYGMLGGEYTIMJXMVSDGNBSGEYDOOJYMFQWGYJRGMZTSNRVHA2TEYJUMRSTIOLFMFQTMZJWGYZDSOBUMYZGIYI='),
 (0.9903846153846154,
  'h',
  'HFRGN\rZTMI4DQZLCGVSXGMLGGEYTIMJXMVSDGNBSGEYDOOJYMFQWGYJRGMZTSNRVHA2TEYJUMRSTIOLFMFQTMZJWGYZDSOBUMYZGIYI='),
 (0.9903846153846154,
  'd',
  'HFRGN\rZTMI4DQZLCGVSWGMLGGEYTIMJXMVSDGNBSGEYDOOJYMFQWGYJRGMZTSNRVHA2TEYJUMRSTIOLFMFQTMZJWGYZDSOBUMYZGIYI='),
 (0.9903846153846154,
  'Z',
  'HFRGN\rZTMI4DQZLCGVSVGMLGGEYTIMJXMVSDGNBSGEYDOOJYMFQWGYJRGMZTSNRVHA2TEYJUMRSTIOLFMFQTMZJWGYZDSOBUMYZGIYI='),
 (0.9903846153846154,
  'V',
  'HFRGN\rZTMI4DQZLCGVSUGMLGGEYTIMJXMVSDGNBSGEYDOOJYMFQWGYJRGMZTSNRVHA2TEYJUMRSTIOLFMFQTMZJWGYZDSOBUMYZGIYI='),
 (0.9903846153846154,
  'R',
  'HFRGN\rZTMI4DQZLCGVSTGMLGGEYTIMJXMVSDGNBSGEYDOOJYMFQWGYJRGMZTSNRVHA2TEYJUMRSTIOLFMFQTMZJWGYZDSOBUMYZGIYI='),
 (0.9903846153846154,
  'N',
  'HFRGN\rZTMI4DQZLCGVSSGMLGGEYTIMJXMVSDGNBSGEYDOOJYMFQWGYJRGMZTSNRVHA2TEYJUMRSTIOLFMFQTMZJWGYZDSOBUMYZGIYI='),
 (0.9903846153846154,
  'J',
  'HFRGN\rZTMI4DQZLCGVSRGMLGGEYTIMJXMVSDGNBSGEYDOOJYMFQWGYJRGMZTSNRVHA2TEYJUMRSTIOLFMFQTMZJWGYZDSOBUMYZGIYI='),
 (0.9903846153846154,
  'F',
  'HFRGN\rZTMI4DQZLCGVSQGMLGGEYTIMJXMVSDGNBSGEYDOOJYMFQWGYJRGMZTSNRVHA2TEYJUMRSTIOLFMFQTMZJWGYZDSOBUMYZGIYI=')]

Python

python
valid=[]
for score,ch,txt in candidates:
    clean=''.join(txt.split())
    if all(c in "ABCDEFGHIJKLMNOPQRSTUVWXYZ234567=" for c in clean):
        try:
            out=base64.b32decode(clean)
            pscore=sum(32<=b<127 for b in out)/len(out)
            hscore=sum(chr(b) in string.hexdigits for b in out)/len(out)
            valid.append((pscore,hscore,ch,out))
        except Exception as e:
            pass
sorted(valid, reverse=True)[:20]


[]

Python

python
score,ch,txt=sorted(candidates, reverse=True)[0]
clean=''.join(txt.split())
len(clean), clean, set(clean)-set("ABCDEFGHIJKLMNOPQRSTUVWXYZ234567=")


(103,
 'HFRGNZTMI4DQZLCGVSZGMLGGEYTIMJXMVSDGNBSGEYDOOJYMFQWGYJRGMZTSNRVHA2TEYJUMRSTIOLFMFQTMZJWGYZDSOBUMYZGIYI=',
 set())

Python

python
def insert_bit_variants(b7):
    vals={}
    for pos in range(8):
        for bit in "01":
            b8=b7[:pos]+bit+b7[pos:]
            vals.setdefault(int(b8,2), []).append((pos,bit,b8))
    return vals
for b in ['0110100','0101010']:
    vals=insert_bit_variants(b)
    print(b, [(v,chr(v) if 32<=v<127 else '.', infos[:2]) for v,infos in sorted(vals.items())])

Python

python
vals1=[v for v in insert_bit_variants('0110100') if chr(v) in alphabet]
vals2=[v for v in insert_bit_variants('0101010') if chr(v) in alphabet]
vals1, [chr(v) for v in vals1], vals2, [chr(v) for v in vals2]


([52, 116, 84, 100, 108, 104, 106, 105],
 ['4', 't', 'T', 'd', 'l', 'h', 'j', 'i'],
 [106, 74, 90, 82, 86, 84, 85],
 ['j', 'J', 'Z', 'R', 'V', 'T', 'U'])

Python

python
base_chars=[int(b,2) for b in bins]  # current bad chars
solutions=[]
for v1 in vals1:
    for v2 in vals2:
        arr=base_chars.copy()
        arr[6]=v1; arr[26]=v2
        b64=bytes(arr)
        try:
            o=base64.b64decode(b64, validate=True)
            txt=o.decode('ascii')
        except Exception:
            continue
        if all(c in "ABCDEFGHIJKLMNOPQRSTUVWXYZ234567=" for c in txt):
            try:
                out=base64.b32decode(txt, casefold=False)
                pscore=sum(32<=b<127 for b in out)/len(out)
                hexscore=sum(chr(b) in string.hexdigits for b in out)/len(out)
                solutions.append((pscore,hexscore,chr(v1),chr(v2),txt,out))
            except Exception as e:
                pass
len(solutions), sorted(solutions, reverse=True)[:10]


(16,
 [(1.0,
   1.0,
   't',
   'V',
   'HFRGKMZTMI4DQZLCGVSUGMLGGEYTIMJXMVSDGNBSGEYDOOJYMFQWGYJRGMZTSNRVHA2TEYJUMRSTIOLFMFQTMZJWGYZDSOBUMYZGIYI=',
   b'9be33b88eb5eC1f11417ed34210798aaca133965852a4de49eaa6e662984f2da'),
  (1.0,
   1.0,
   't',
   'R',
   'HFRGKMZTMI4DQZLCGVSTGMLGGEYTIMJXMVSDGNBSGEYDOOJYMFQWGYJRGMZTSNRVHA2TEYJUMRSTIOLFMFQTMZJWGYZDSOBUMYZGIYI=',
   b'9be33b88eb5e31f11417ed34210798aaca133965852a4de49eaa6e662984f2da'),
  (1.0,
   1.0,
   'l',
   'V',
   'HFRGIMZTMI4DQZLCGVSUGMLGGEYTIMJXMVSDGNBSGEYDOOJYMFQWGYJRGMZTSNRVHA2TEYJUMRSTIOLFMFQTMZJWGYZDSOBUMYZGIYI=',
   b'9bd33b88eb5eC1f11417ed34210798aaca133965852a4de49eaa6e662984f2da'),
  (1.0,
   1.0,
   'l',
   'R',
   'HFRGIMZTMI4DQZLCGVSTGMLGGEYTIMJXMVSDGNBSGEYDOOJYMFQWGYJRGMZTSNRVHA2TEYJUMRSTIOLFMFQTMZJWGYZDSOBUMYZGIYI=',
   b'9bd33b88eb5e31f11417ed34210798aaca133965852a4de49eaa6e662984f2da'),
  (1.0,
   1.0,
   'd',
   'V',
   'HFRGGMZTMI4DQZLCGVSUGMLGGEYTIMJXMVSDGNBSGEYDOOJYMFQWGYJRGMZTSNRVHA2TEYJUMRSTIOLFMFQTMZJWGYZDSOBUMYZGIYI=',
   b'9bc33b88eb5eC1f11417ed34210798aaca133965852a4de49eaa6e662984f2da'),
  (1.0,
   1.0,
   'd',
   'R',
   'HFRGGMZTMI4DQZLCGVSTGMLGGEYTIMJXMVSDGNBSGEYDOOJYMFQWGYJRGMZTSNRVHA2TEYJUMRSTIOLFMFQTMZJWGYZDSOBUMYZGIYI=',
   b'9bc33b88eb5e31f11417ed34210798aaca133965852a4de49eaa6e662984f2da'),
  (1.0,
   0.984375,
   't',
   'Z',
   'HFRGKMZTMI4DQZLCGVSVGMLGGEYTIMJXMVSDGNBSGEYDOOJYMFQWGYJRGMZTSNRVHA2TEYJUMRSTIOLFMFQTMZJWGYZDSOBUMYZGIYI=',
   b'9be33b88eb5eS1f11417ed34210798aaca133965852a4de49eaa6e662984f2da'),
  (1.0,
   0.984375,
   'l',
   'Z',
   'HFRGIMZTMI4DQZLCGVSVGMLGGEYTIMJXMVSDGNBSGEYDOOJYMFQWGYJRGMZTSNRVHA2TEYJUMRSTIOLFMFQTMZJWGYZDSOBUMYZGIYI=',
   b'9bd33b88eb5eS1f11417ed34210798aaca133965852a4de49eaa6e662984f2da'),
  (1.0,
   0.984375,
   'd',
   'Z',
   'HFRGGMZTMI4DQZLCGVSVGMLGGEYTIMJXMVSDGNBSGEYDOOJYMFQWGYJRGMZTSNRVHA2TEYJUMRSTIOLFMFQTMZJWGYZDSOBUMYZGIYI=',
   b'9bc33b88eb5eS1f11417ed34210798aaca133965852a4de49eaa6e662984f2da'),
  (0.984375,
   0.984375,
   't',
   'J',
   'HFRGKMZTMI4DQZLCGVSRGMLGGEYTIMJXMVSDGNBSGEYDOOJYMFQWGYJRGMZTSNRVHA2TEYJUMRSTIOLFMFQTMZJWGYZDSOBUMYZGIYI=',
   b'9be33b88eb5e\x131f11417ed34210798aaca133965852a4de49eaa6e662984f2da')])

Python

python
ct=bytes.fromhex('9bc33b88eb5e31f11417ed34210798aaca133965852a4de49eaa6e662984f2da')
prefix=b'CYBERCOM{'
len(ct), len(prefix)


(32, 9)

Python

python
def dec_rep(ct,key):
    return bytes(c ^ key[i%len(key)] for i,c in enumerate(ct))
for L in range(1,10):
    key=[None]*L
    ok=True
    for i,p in enumerate(prefix):
        k=ct[i]^p
        j=i%L
        if key[j] is not None and key[j]!=k:
            ok=False
        key[j]=k
    if not ok or any(k is None for k in key):
        continue
    keyb=bytes(key)
    pt=dec_rep(ct,keyb)
    printable=sum(32<=b<127 for b in pt)/len(pt)
    print(L,keyb,printable,pt)

Python

python
ct=bytes.fromhex('9bc33b88eb5e31f11417ed34210798aaca133965852a4de49eaa6e662984f2da')
transforms={}
transforms['xor_prev_cipher'] = bytes([ct[0]]+[ct[i]^ct[i-1] for i in range(1,len(ct))])
transforms['xor_next_cipher'] = bytes([ct[i]^ct[i+1] for i in range(len(ct)-1)]+[ct[-1]])
transforms['xor_reverse'] = bytes(a^b for a,b in zip(ct, ct[::-1]))
transforms['xor_halves'] = bytes(a^b for a,b in zip(ct[:16],ct[16:]))
transforms['reverse'] = ct[::-1]
for name,b in transforms.items():
    printable=sum(32<=x<127 for x in b)/len(b)
    print(name, printable, b)

Python

python
# known-prefix diagnostics for chained XOR models
p=prefix
# model P_i = C_i xor C_{i-1} xor k (fixed k), i>=1
ks=[ct[i]^ct[i-1]^p[i] for i in range(1,len(p))]
ks


[1, 186, 246, 49, 246, 32, 141, 158]

Python

python
import importlib.util, os, glob, hashlib
mods=['wordfreq','wordninja','wordfreq']
[(m, importlib.util.find_spec(m)) for m in mods]


[('wordfreq', None), ('wordninja', None), ('wordfreq', None)]

Python

python
def score_text(b):
    # printable + common flag charset and English-ish
    s=0
    for x in b:
        c=chr(x)
        if c in string.ascii_letters+string.digits+"_{}-!@#$%^&*().:/":
            s+=2
        elif c==' ':
            s+=2
        elif 32<=x<127:
            s+=0.5
        else:
            s-=4
    # reward known substring
    txt=''.join(chr(x) if 32<=x<127 else '.' for x in b)
    for token in ['CYBERCOM','FLAG','flag','cyber','CTF']:
        if token in txt: s+=20
    return s
best=[]
for k in range(256):
    pt=bytes(c^k for c in ct)
    best.append((score_text(pt),k,pt))
sorted(best, reverse=True)[:10]


[(-44,
  171,
  b'0h\x90#@\xf5\x9aZ\xbf\xbcF\x9f\x8a\xac3\x01a\xb8\x92\xce.\x81\xe6O5\x01\xc5\xcd\x82/Yq'),
 (-44,
  67,
  b'\xd8\x80x\xcb\xa8\x1dr\xb2WT\xaewbD\xdb\xe9\x89Pz&\xc6i\x0e\xa7\xdd\xe9-%j\xc7\xb1\x99'),
 (-44,
  64,
  b'\xdb\x83{\xc8\xab\x1eq\xb1TW\xadtaG\xd8\xea\x8aSy%\xc5j\r\xa4\xde\xea.&i\xc4\xb2\x9a'),
 (-45.5,
  190,
  b'%}\x856U\xe0\x8fO\xaa\xa9S\x8a\x9f\xb9&\x14t\xad\x87\xdb;\x94\xf3Z \x14\xd0\xd8\x97:Ld'),
 (-45.5,
  189,
  b'&~\x865V\xe3\x8cL\xa9\xaaP\x89\x9c\xba%\x17w\xae\x84\xd88\x97\xf0Y#\x17\xd3\xdb\x949Og'),
 (-45.5,
  178,
  b')q\x89:Y\xec\x83C\xa6\xa5_\x86\x93\xb5*\x18x\xa1\x8b\xd77\x98\xffV,\x18\xdc\xd4\x9b6@h'),
 (-45.5,
  177,
  b'*r\x8a9Z\xef\x80@\xa5\xa6\\\x85\x90\xb6)\x1b{\xa2\x88\xd44\x9b\xfcU/\x1b\xdf\xd7\x985Ck'),
 (-45.5,
  173,
  b'6n\x96%F\xf3\x9c\\\xb9\xba@\x99\x8c\xaa5\x07g\xbe\x94\xc8(\x87\xe0I3\x07\xc3\xcb\x84)_w'),
 (-45.5,
  172,
  b'7o\x97$G\xf2\x9d]\xb8\xbbA\x98\x8d\xab4\x06f\xbf\x95\xc9)\x86\xe1H2\x06\xc2\xca\x85(^v'),
 (-45.5,
  168,
  b'3k\x93 C\xf6\x99Y\xbc\xbfE\x9c\x89\xaf0\x02b\xbb\x91\xcd-\x82\xe5L6\x02\xc6\xce\x81,Zr')]

Python

python
ct0=ct
pref=prefix
hits=[]

# family p_i = c_i xor ((a + b*i) mod 256)
for b in range(256):
    a=ct0[0]^pref[0]  # k0
    if all((ct0[i]^((a+b*i)&255))==pref[i] for i in range(len(pref))):
        hits.append(("xor_linear_index",a,b))
# p_i = (c_i - (a+b*i)) mod256 or + 
for op in ['sub','add']:
    for b in range(256):
        if op=='sub':
            a=(ct0[0]-pref[0])&255
            ok=all(((ct0[i]-((a+b*i)&255))&255)==pref[i] for i in range(len(pref)))
        else:
            a=(pref[0]-ct0[0])&255
            ok=all(((ct0[i]+((a+b*i)&255))&255)==pref[i] for i in range(len(pref)))
        if ok: hits.append((op

([], 0)

Python

python
hex_solutions=[]
for pscore,hscore,ch1,ch2,txt,out in solutions:
    try:
        raw=bytes.fromhex(out.decode())
        hex_solutions.append((ch1,ch2,out.decode(),raw))
    except Exception:
        pass
len(hex_solutions), [(a,b,h[:16]) for a,b,h,_ in hex_solutions]


(6,
 [('t', 'R', '9be33b88eb5e31f1'),
  ('t', 'V', '9be33b88eb5eC1f1'),
  ('d', 'R', '9bc33b88eb5e31f1'),
  ('d', 'V', '9bc33b88eb5eC1f1'),
  ('l', 'R', '9bd33b88eb5e31f1'),
  ('l', 'V', '9bd33b88eb5eC1f1')])

Python

python
h='9bc33b88eb5e31f11417ed34210798aaca133965852a4de49eaa6e662984f2da'
hb=h.encode()
tests={}
tests['ascii_hex_xor_prev']=bytes([hb[0]]+[hb[i]^hb[i-1] for i in range(1,len(hb))])
tests['ascii_hex_xor_next']=bytes([hb[i]^hb[i+1] for i in range(len(hb)-1)]+[hb[-1]])
# nibble adjacent xor, group outputs into nibbles then bytes
nibs=[int(c,16) for c in h]
nx_prev=[nibs[0]]+[nibs[i]^nibs[i-1] for i in range(1,len(nibs))]
if len(nx_prev)%2==0:
    tests['nibble_xor_prev']=bytes((nx_prev[i]<<4)|nx_prev[i+1] for i in range(0,len(nx_prev),2))
nx_pair=[nibs[i]^nibs[i+1] for i in range(0,len(nibs),2)]
tests['pair_nibble_xor_values']=bytes(nx_pair)
for k,v in tests.items():
    print(k, sum

Python

python
import hashlib, itertools, re, string, base64, binascii
words=['cybercom','CYBERCOM','Cybercom','cyber','Cyber','ctf','CTF','flag','FLAG','xor','XOR','hex','base64','base32','binary','decode','decrypt','crypto','cipher','chaining','chain','password','secret','key','challenge','2026','cybercom2026','cybercomctf','cybercom_ctf']
phrases=set(words)
for a,b in itertools.product(words[:12], words[:12]):
    phrases.add(a+b)
    phrases.add(a+'_'+b)
    phrases.add(a+'-'+b)
required=bytes(c^p for c,p in zip(ct,prefix))
matches=[]
for ph in phrases:
    bs=ph.encode()
    ks_candidates={
        'sha256':hashlib.sha256(bs).digest(),
        'sha3_256':hashlib.sha3_256(bs).digest(),
        'blake2s':hashlib.blake2s(bs).digest(),
        'md5x2':hashlib.md5(bs).digest()*2,
    }
    for alg,k in ks_candidates.items():
        if k[:len(required)]==required:
            matches.append((ph,alg))
matches[:10], len(matches), required.hex()


([], 0, 'd89a79cdb91d7ebc6f')

Python

python
def rol8(x,r): return ((x<<r)|(x>>(8-r)))&0xff if r else x
def ror8(x,r): return ((x>>r)|(x<<(8-r)))&0xff if r else x

models=[]
# P_i = C_i xor f(C_{i-1}) xor k
for fname,f in [('rolC',rol8),('rorC',ror8)]:
    for r in range(8):
        k=ct[1]^f(ct[0],r)^prefix[1]
        if all((ct[i]^f(ct[i-1],r)^k)==prefix[i] for i in range(1,len(prefix))):
            models.append((fname,r,k))
# C_i = P_i xor f(P_{i-1}) xor k => infer k and check
for fname,f in [('rolP',rol8),('rorP',ror8)]:
    for r in range(8):
        k=ct[1]^prefix[1]^f(prefix[0],r)
        if all((prefix[i]^f(prefix[i-1],r)^k)==ct

[]

Python

python
hb=h.encode()
cand=[]
for k in range(256):
    out=bytes(x^k for x in hb)
    pr=sum(32<=x<127 for x in out)/len(out)
    # encoding alphabet scores
    trytxt=''.join(chr(x) for x in out if 32<=x<127)
    hexsc=sum(chr(x) in string.hexdigits for x in out)/len(out)
    b64sc=sum(chr(x) in (string.ascii_letters+string.digits+'+/=') for x in out)/len(out)
    if pr>0.95:
        cand.append((hexsc,b64sc,k,out))
sorted(cand, reverse=True)[:10]


[(1.0,
  1.0,
  0,
  b'9bc33b88eb5e31f11417ed34210798aaca133965852a4de49eaa6e662984f2da'),
 (0.859375,
  0.890625,
  1,
  b'8cb22c99dc4d20g00506de25301689``b`022874943`5ed58d``7d773895g3e`'),
 (0.84375,
  0.84375,
  7,
  b'>ed44e??be2b46a66360bc435670>?ffdf644>12?25f3cb3>bff1b115>?3a5cf'),
 (0.796875,
  0.984375,
  80,
  b'i23cc2hh52e5ca6aadag54cdba`gih1131accifeheb1d45di511f5ffbihd6b41'),
 (0.796875,
  0.96875,
  87,
  b'n54dd5oo25b2df1ffcf`23dcefg`no6646fddnabobe6c32cn266a2aaenoc1e36'),
 (0.765625,
  0.875,
  4,
  b'=fg77f<<af1a75b55053a`706543=<eege577=21<16e0`a0=aee2a226=<0b6`e'),
 (0.765625,
  0.8125,
  3,
  b':a`00a;;fa6f02e22724fg071234:;bb`b200:56;61b7gf7:fbb5f551:;7e1gb'),
 (0.734375,
  0.953125,
  85,
  b'l76ff7mm07`0fd3ddadb01fagdeblm4464dfflc`m`g4a10al044c0ccglma3g14'),
 (0.734375,
  0.9375,
  82,
  b'k01aa0jj70g7ac4ccfce76af`cbekj3313caakdgjg`3f67fk733d7dd`kjf4`63'),
 (0.703125,
  0.828125,
  5,
  b'<gf66g==`g0`64c44142`a617452<=ddfd466<30=07d1a`1<`dd3`337<=1c7ad')]

Python

python
# Test all 6 raw candidates against basic xor models and known prefix.
reports=[]
for ch1,ch2,hs,raw in hex_solutions:
    # repeating key lengths 1-9 consistency
    rep=[]
    for L in range(1,10):
        key=[None]*L; ok=True
        for i,pb in enumerate(prefix):
            k=raw[i]^pb; j=i%L
            if key[j] is not None and key[j]!=k: ok=False; break
            key[j]=k
        if ok and all(k is not None for k in key):
            rep.append(L)
    # prev cipher equality count positions 1..8
    prev=bytes([raw[0]]+[raw[i]^raw[i-1] for i in range(1,len(raw))])
    eq=sum(prev[i]==prefix[i] for i in range(1,len(prefix)))
    # prev with fixed k consistency
    ks=[raw[i]^raw[i-1]^prefix[i] for i in range(1,len(prefix))]
    fixed=(len(set(ks))==1)
    reports.append((ch1,ch2,hs[:16],rep,eq,fixed))
reports


[('t', 'R', '9be33b88eb5e31f1', [9], 0, False),
 ('t', 'V', '9be33b88eb5eC1f1', [9], 0, False),
 ('d', 'R', '9bc33b88eb5e31f1', [9], 0, False),
 ('d', 'V', '9bc33b88eb5eC1f1', [9], 0, False),
 ('l', 'R', '9bd33b88eb5e31f1', [9], 0, False),
 ('l', 'V', '9bd33b88eb5eC1f1', [9], 0, False)]

思考

Evaluated alternate hex repairs and XOR models

Worked for 3m 7s

回答

I tried the XOR/chaining route rather than stopping at the hex.

The likely hex candidate is:

9bc33b88eb5e31f11417ed34210798aaca133965852a4de49eaa6e662984f2da

Hex-decoded bytes:

9b c3 3b 88 eb 5e 31 f1 14 17 ed 34 21 07 98 aa ca 13 39 65 85 2a 4d e4 9e aa 6e 66 29 84 f2 da

I tested:

  • all 256 single-byte XOR keys → no meaningful plaintext
  • repeating-key XOR using the known crib CYBERCOM{ → key lengths 1–8 are mathematically inconsistent; length 9 decrypts the rest to garbage
  • C[i] XOR C[i-1] and C[i] XOR C[i+1] → garbage
  • chained XOR plus a constant key → inconsistent with CYBERCOM{
  • XOR against reversed ciphertext / two halves → garbage
  • XOR at the ASCII-hex level → no useful secondary encoding
  • XOR at the nibble level → no useful plaintext
  • rotating previous ciphertext byte before XOR, all 8 rotations → none match the flag prefix
  • simple index/rolling XOR and add/subtract chains → none match
  • common key-derived SHA-256/SHA3/BLAKE2s XOR masks such as cybercom, flag, xor, ctf, etc. → no hit
  • exact-hash lookup/search → no public preimage hit

There is also an important wrinkle in the original data: the binary layer contains two 7-bit chunks. Repairing them in every way that preserves the later Base64/Base32 layers gives six valid hexadecimal endpoints, including the 9bc3... one. I tested the basic XOR/crib attacks against all six; none behaves like weak repeating/chained XOR.

The CYBERCOM{ crib is especially convincing. For the 9bc3... candidate, an ordinary XOR encryption would require the first nine keystream bytes to be:

d8 9a 79 cd b9 1d 7e bc 6f

That looks deliberately high-entropy rather than like a repeating/text key.

So the evidence currently points toward the final 32 bytes being either a 256-bit hash (SHA-256/SHA3-256/BLAKE2s-sized) or ciphertext produced with an actual cryptographic key, rather than another simple encoding/XOR layer. A 64-character hex value alone cannot uniquely identify which 256-bit hash algorithm produced it. (Boneyard Tools)

The useful next attack is therefore challenge-context based: challenge title, hint, category, attached script/source, or any suggested password/key would give us material for a dictionary/KDF/AES/RC4 attack. Without that, inventing CYBERCOM{...} from these 32 bytes would just be guessing.

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