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key = b'af16d2be89' iv = b'1267c0a384' ciphertext ...

Erstellt am: 27. Dezember 2025

Beantwortet mit GPT-5.2 Thinking von Chat01

Frage

key = b'af16d2be89'
iv = b'1267c0a384'
ciphertext = "zwigdGvSD4whnlVAvqyeTyheBYSXALx8JmukmD0Auns2PZ8wN1b16vCts1dNICJD"分析获取密文结果

Python

python
import base64, binascii, textwrap, math, hashlib, os, itertools, string, re
ct="zwigdGvSD4whnlVAvqyeTyheBYSXALx8JmukmD0Auns2PZ8wN1b16vCts1dNICJD"
raw=base64.b64decode(ct)
len(raw), raw[:16]


(48, b'\xcf\x08\xa0tk\xd2\x0f\x8c!\x9eU@\xbe\xac\x9eO')

Python

python
import hashlib, itertools, math
from Crypto.Cipher import AES
from Crypto.Util.Padding import unpad

def derivations(b):
    # returns list of (name, bytes16)
    outs=[]
    # zero pad right
    outs.append(("zeropad_r", b.ljust(16,b'\x00')[:16]))
    # zero pad left
    outs.append(("zeropad_l", b.rjust(16,b'\x00')[-16:]))
    # repeat
    outs.append(("repeat", (b*math.ceil(16/len(b)))[:16]))
    # md5
    outs.append(("md5", hashlib.md5(b).digest()))
    # sha1 first16
    outs.append(("sha1_16", hashlib.sha1(b).digest()[:16]))
    # sha256 first16
    outs.append(("sha256_16", hashlib.sha256(b).digest()[:16]))
    # if b looks hex, decode
    try:
        hb=bytes.fromhex(b.decode())
        outs.append(("hex_zeropad_r", hb.ljust(16,b'\x00')[:16]))
        outs.append(("hex_repeat", (hb*math.ceil(16/len(hb)))[:16]))
        outs.append(("hex_md5", hashlib.md5(hb).digest()))
        outs.append(("hex_sha256_16", hashlib.sha256(hb).digest()[:16]))
    except Exception:
        pass
    # unique
    uniq={}
    for name, val in outs:
        uniq[(name,val)]=val
    return outs

def score_pt(pt):
    # score based on printable ratio and utf-8
    try:
        s=pt.decode('utf-8')
        utf=True
    except Exception:
        utf=False
        s=None
    printable=sum( (32<=c<=126) or c in b'\r\n\t' for c in pt)
    ratio=printable/len(pt)
    # bonus if contains common patterns
    bonus=0
    if utf and any(ch in s for ch in ['{','}','flag','FLAG','CTF','http','https','密码','明文','密文']):
        bonus+=0.2
    if utf and all(ord(ch)<128 for ch in s):
        bonus+=0.05
    return ratio+bonus+(0.1 if utf else 0)

candidates=[]
for kname,kbytes in derivations(key):
    for vname,vbytes in derivations(iv):
        try:
            cipher=AES.new(kbytes,AES.MODE_CBC,iv=vbytes)
            pt=cipher.decrypt(raw)
            # try unpad
            for do_unpad in [True,False]:
                try:
                    upt=unpad(pt,16) if do_unpad else pt
                except Exception:
                    continue
                sc=score_pt(upt)
                candidates.append((sc,kname,vname,do_unpad,upt))
        except Exception:
            continue
candidates_sorted=sorted(candidates,key=lambda x:x[0],reverse=True)
candidates_sorted[:10]


[(0.5416666666666666,
  'hex_md5',
  'sha256_16',
  False,
  b'j:\x1f\x82\x94`W\\]\xb3\nE*[U\x8f%\xf4\xa2p\xd1\x1a7\x8c\r\x9b\x1f\x17\x10GQsnO\xb3\xe0\xb9\xbd\r}\xf2\xfe\x1d@\xe1WT!'),
 (0.5416666666666666,
  'hex_sha256_16',
  'hex_zeropad_r',
  False,
  b"\xe5\xcfL'I\x8eP\xc3pn>~\xce\r\x12\xf1*)\x1aybX\x15\xb0V\xac\xfe\x8f4gT\xa53oUO\xc7\x7f!&a\x0e\xf9r\xf6\xbc\xca\xc9"),
 (0.5208333333333334,
  'hex_repeat',
  'sha1_16',
  False,
  b"%a\x11\xeb>\xfc\x98U!6'q*X\xf7\x85U\x1e>\xd2)\xdc\x14\\\xdf\x12\xdb<,=\xde\xde_\xea\xb72Y~\x10\xc5\xcd\xc8\x13~s3t\x98"),
 (0.5,
  'sha1_16',
  'hex_repeat',
  False,
  b'X]\x1b\r2J\xa1:Y\rK(\xe4\x1b\xf8\xa8~\xbf4tHVj\x80\xfb\xea\xd4\xffJ3\xb9W+\xef\x03o\xd4|\xde\xea\\\x84\xeaF\xb4\xd9\xe0\xfc'),
 (0.5,
  'hex_md5',
  'repeat',
  False,
  b'n\x14>\xc5\x19 \xbd>\x0e\x8b\x9f|i<TK%\xf4\xa2p\xd1\x1a7\x8c\r\x9b\x1f\x17\x10GQsnO\xb3\xe0\xb9\xbd\r}\xf2\xfe\x1d@\xe1WT!'),
 (0.5,
  'hex_md5',
  'sha1_16',
  False,
  b'Y\xcd}\xe3\xa6\xa9,\x10^\x8euW~\xb252%\xf4\xa2p\xd1\x1a7\x8c\r\x9b\x1f\x17\x10GQsnO\xb3\xe0\xb9\xbd\r}\xf2\xfe\x1d@\xe1WT!'),
 (0.5,
  'hex_md5',
  'hex_zeropad_r',
  False,
  b'MA\xc8Q\xfe\x10\xdc\r6\xbf\xaeN_\x0b7{%\xf4\xa2p\xd1\x1a7\x8c\r\x9b\x1f\x17\x10GQsnO\xb3\xe0\xb9\xbd\r}\xf2\xfe\x1d@\xe1WT!'),
 (0.5,
  'hex_sha256_16',
  'zeropad_l',
  False,
  b'\xf7\xa8\x8c\x84\xcd\x8ea\xf1FY]N\xaf>*\xc5*)\x1aybX\x15\xb0V\xac\xfe\x8f4gT\xa53oUO\xc7\x7f!&a\x0e\xf9r\xf6\xbc\xca\xc9'),
 (0.4791666666666667,
  'zeropad_r',
  'hex_zeropad_r',
  False,
  b'lP\xce9ZY\xa6X\xe1\x13t\xa6\x94F\x85\xb3\xf2\x12\xcd\xa9\n\x06=hxC=\xb6I\xc8\x80`\x9b\xa0z\xd1\xd0JmC:\x0f\xc9\xa7\xdc%\xbdp'),
 (0.4791666666666667,
  'zeropad_r',
  'hex_repeat',
  False,
  b'lP\xce9ZK\xc1\x98B\x97f\xc1T\xe5\x01\xa1\xf2\x12\xcd\xa9\n\x06=hxC=\xb6I\xc8\x80`\x9b\xa0z\xd1\xd0JmC:\x0f\xc9\xa7\xdc%\xbdp')]

Python

python
utf_candidates=[]
for sc,kname,vname,do_unpad,pt in candidates_sorted:
    try:
        s=pt.decode('utf-8')
        utf_candidates.append((sc,kname,vname,do_unpad,s))
    except:
        continue
utf_candidates[:20], len(utf_candidates)


([], 0)

Python

python
from Crypto.Cipher import DES, DES3
from Crypto.Util.Padding import unpad
key_ascii=b"af16d2be89"
iv_ascii=b"1267c0a384"
ct_raw=raw

def try_modes(cipher_cls, key_bytes, iv_bytes):
    results=[]
    # CBC
    try:
        c=cipher_cls.new(key_bytes, cipher_cls.MODE_CBC, iv=iv_bytes)
        pt=c.decrypt(ct_raw)
        for unp in [True,False]:
            try:
                upt=unpad(pt, cipher_cls.block_size) if unp else pt
            except:
                continue
            results.append(("CBC",unp,upt))
    except Exception as e:
        pass
    # CFB
    try:
        c=cipher_cls.new(key_bytes, cipher_cls.MODE_CFB, iv=iv_bytes)
        pt=c.decrypt(ct_raw)
        results.append(("CFB",False,pt))
    except:
        pass
    # OFB
    try:
        c=cipher_cls.new(key_bytes, cipher_cls.MODE_OFB, iv=iv_bytes)
        pt=c.decrypt(ct_raw)
        results.append(("OFB",False,pt))
    except:
        pass
    return results

def evaluate(pt):
    # try decode to utf-8 or latin1
    try:
        return True, pt.decode('utf-8')
    except:
        try:
            s=pt.decode('latin1')
            # check printable ratio
            printable=sum( (32<=ord(ch)<=126) or ch in '\r\n\t' for ch in s)/len(s)
            if printable>0.9:
                return True,s
        except:
            pass
    return False,None

# DES with first 8 bytes ascii
key8=key_ascii[:8]
iv8=iv_ascii[:8]
res=try_modes(DES,key8,iv8)
[(mode,unp,pt[:50],evaluate(pt)[0]) for mode,unp,pt in res][:10], len(res)


([('CBC',
   False,
   b'{\xa4V\xd8V9{sW\x88\xb6\xefm\xf8b\x03\n\x8a\x9b\xf3\x195\xc0\x14\xa6\x90r\x8e\x7f\n?\xb9\xc6\xd3\x90{>\xf73\x0c3$@=l\x06w`',
   False),
  ('CFB',
   False,
   b'\xd2\x96FDML\xd8\x98\x11\xb8\x8b(\xd8\xf8\x81b\x1a\xf1\x9fw\x9c%V\xe9\x14\xe2\x1b\xfb\xe7c\xe7\x13M\x19\x07Y\x82f\xd2\x13\x1c\x96\x04\x82H\xa7\xfb\x9d',
   False),
  ('OFB',
   False,
   b'\xd25\x05\xa2\x1bL\xab\xeb\x7fa42a\xa3\xb0\x12\xf7\xf9\x1e\xfa\xd4\xf9\xd2\xf5\xd8\tC\x8e\xb2,\x85\x80\xe7z\xddc\xf8\x9d\x1d\x18\xdb\x0b\xd7\x11l<T\xeb',
   False)],
 3)

Python

python
key8_hex=bytes.fromhex("af16d2be89"+"000000")
iv8_hex=bytes.fromhex("1267c0a384"+"000000")
res=try_modes(DES,key8_hex,iv8_hex)
[(mode,unp,evaluate(pt)[0],pt[:32]) for mode,unp,pt in res]


[('CBC',
  False,
  False,
  b'\xc2r\xda\xc5+\x1c\x83\x06\xba\xff\xbaP\xc2\x98\xabV\xf7/\xef\x1e/\xbbN3"\xd0\xfd\x9a\xa9\x11\x057'),
 ('CFB',
  False,
  False,
  b'\x94:]L\x02h|\xc5\x06\x04\x8bP\x84\xa6+\xd9\t\xb8\xe3\xa9\x8c\xe7\xa3\x97M\xbc+\x1c\x02\xdc\x99Z'),
 ('OFB',
  False,
  False,
  b'\x94I\x0e\xf2\xd9\xec>\xff\xbd\xf3\xccs\xc3\xd1Z\xf9\x87p\x8c\x1c\xf2\x96\xa4\xa6\xf0Ad\x13\xee499')]

Python

python
from Crypto.Cipher import DES3
def get3des_key(b, size):
    # size 16 or 24
    return b.ljust(size,b'\x00')[:size]
def try_3des():
    outs=[]
    for size in [16,24]:
        k=get3des_key(key_ascii, size)
        for iv in [iv_ascii.ljust(8,b'\x00')[:8], iv_ascii[:8], iv8_hex, iv_ascii[-8:]]:
            try:
                k2=DES3.adjust_key_parity(k)
            except Exception:
                continue
            try:
                c=DES3.new(k2, DES3.MODE_CBC, iv=iv)
                pt=c.decrypt(ct_raw)
                for unp in [True,False]:
                    try:
                        upt=unpad(pt,8) if unp else pt
                    except:
                        continue
                    ok,s=evaluate(upt)
                    outs.append((ok, size, iv, unp, upt[:50], s[:100] if s else None))
            except Exception as e:
                pass
    return outs
outs=try_3des()
[o for o in outs if o[0]][:5], len(outs)


([], 8)

Python

python
import hashlib, itertools, math, binascii
from Crypto.Cipher import AES
from Crypto.Util.Padding import unpad

key_s=b"af16d2be89"
iv_s=b"1267c0a384"

def base_variants(b):
    vars=[]
    vars.append(("ascii", b))
    # try hex decode if possible
    try:
        vars.append(("hex", bytes.fromhex(b.decode())))
    except:
        pass
    return vars

def hash_variants(name, b):
    hs=[]
    hs.append((f"{name}", b))
    hs.append((f"{name}_md5", hashlib.md5(b).digest()))
    hs.append((f"{name}_sha1", hashlib.sha1(b).digest()))
    hs.append((f"{name}_sha256", hashlib.sha256(b).digest()))
    hs.append((f"{name}_sha512", hashlib.sha512(b).digest()))
    return hs

def stretch_to_sizes(name,b):
    outs=[]
    for size in [16,24,32]:
        # repeat
        outs.append((f"{name

(306, 74)

Python

python
import string, zlib, gzip, io, json, re
def printable_ratio(pt):
    return sum((32<=c<=126) or c in b'\r\n\t' for c in pt)/len(pt) if pt else 0

def extra_score(pt):
    score=printable_ratio(pt)
    # if looks like utf-8
    try:
        s=pt.decode('utf-8')
        score+=0.15
        if re.search(r'[\x00-\x08]', s):
            score-=0.2
        if any(tok in s.lower() for tok in ['flag','ctf','http','{','}','password','key','iv','密文','明文']):
            score+=0.3
        if re.match(r'^\s*[{[]', s):
            score+=0.2
    except:
        pass
    # check if zlib
    if pt.startswith(b'\x78\x9c') or pt.startswith(b'\x78\x01') or pt.startswith(b'\x78\xda'):
        score+=0.1
    if pt.startswith(b'PK\x03\x04') or pt.startswith(b'\x1f\x8b'):
        score+=0.1
    return score

best=[]
for kname,kb in keys:
    for ivname,ivb in ivs:
        try:
            cipher=AES.new(kb, AES.MODE_CBC, iv=ivb)
            pt=cipher.decrypt(ct_raw)
            try:
                upt=unpad(pt,16)
            except:
                continue
            sc=extra_score(upt)
            if sc>0.9:
                best.append((sc,kname,ivname,upt))
        except Exception:
            continue
len(best), (sorted(best, key=lambda x:x[0], reverse=True)[:5] if best else None)


(0, None)

Python

python
best=[]
for kname,kb in keys:
    for ivname,ivb in ivs:
        try:
            cipher=AES.new(kb, AES.MODE_CBC, iv=ivb)
            pt=cipher.decrypt(ct_raw)
            try:
                upt=unpad(pt,16)
            except:
                continue
            sc=extra_score(upt)
            best.append((sc,kname,ivname,upt))
        except Exception:
            continue
best_sorted=sorted(best, key=lambda x:x[0], reverse=True)
best_sorted[:10], len(best_sorted)


([(0.5319148936170213,
   'hex+hex_sha256_rep24',
   'hex+hex_sha256_rep16_16',
   b'\xd4--t\xd5B"XL_\xed+a&+\xa0V\x0f\xcd\xce\xab\xfa\x81\x0c\x8b\xd5I\xd8\x91#Df9\xb8\x02{7]y\xebt\xc4?\xdf\xcd\xa0/'),
  (0.5106382978723404,
   'hex+hex_sha256_rep24',
   'hex+ascii_sha1_rep16_16',
   b'S)C\xf6\xad\xa6*Y\rI:^\xeel\xd9\nV\x0f\xcd\xce\xab\xfa\x81\x0c\x8b\xd5I\xd8\x91#Df9\xb8\x02{7]y\xebt\xc4?\xdf\xcd\xa0/'),
  (0.46808510638297873,
   'hex+hex_sha256_rep24',
   'ascii_md5_rep16_16',
   b'\xcb\xcau\x15g\xf0F\x98eY\x90H>\x9ambV\x0f\xcd\xce\xab\xfa\x81\x0c\x8b\xd5I\xd8\x91#Df9\xb8\x02{7]y\xebt\xc4?\xdf\xcd\xa0/'),
  (0.46808510638297873,
   'hex+hex_sha256_rep24',
   'asciimd5_sha1_rep16_16',
   b'+\xab\r\xf13`"D\r\'{\xe7\xbd\x85\xf7\xbfV\x0f\xcd\xce\xab\xfa\x81\x0c\x8b\xd5I\xd8\x91#Df9\xb8\x02{7]y\xebt\xc4?\xdf\xcd\xa0/'),
  (0.46808510638297873,
   'hex+hex_sha256_rep24',
   'asciisha256_md5_rep16_16',
   b'i\t@k\xd2\x011\x02N\xa2\x187\x08\x15h*V\x0f\xcd\xce\xab\xfa\x81\x0c\x8b\xd5I\xd8\x91#Df9\xb8\x02{7]y\xebt\xc4?\xdf\xcd\xa0/'),
  (0.46808510638297873,
   'hex+hex_sha256_rep24',
   'hex_sha256_rep16_16',
   b'_\x9eS-\xfb7e@\xd4\x9dr\x08\x06w+\xb1V\x0f\xcd\xce\xab\xfa\x81\x0c\x8b\xd5I\xd8\x91#Df9\xb8\x02{7]y\xebt\xc4?\xdf\xcd\xa0/'),
  (0.44680851063829785,
   'hex+hex_sha256_rep24',
   'ascii+ascii_sha1_rep16_16',
   b'4k\xa8\xe5L\r\x83GTLm\x99\xc6\xdb\xdb\x8dV\x0f\xcd\xce\xab\xfa\x81\x0c\x8b\xd5I\xd8\x91#Df9\xb8\x02{7]y\xebt\xc4?\xdf\xcd\xa0/'),
  (0.44680851063829785,
   'hex+hex_sha256_rep24',
   'asciimd5_sha512_rep16_16',
   b"\xd5yj'\xb2\x92C\x9c\xfal\x9az\x19\xe0>,V\x0f\xcd\xce\xab\xfa\x81\x0c\x8b\xd5I\xd8\x91#Df9\xb8\x02{7]y\xebt\xc4?\xdf\xcd\xa0/"),
  (0.44680851063829785,
   'hex+hex_sha256_rep24',
   'ascii+hex_sha512_rep16_16',
   b'\x9c-d\xcc\xde\x92*m\x90}P:\xfc:\x88\xd9V\x0f\xcd\xce\xab\xfa\x81\x0c\x8b\xd5I\xd8\x91#Df9\xb8\x02{7]y\xebt\xc4?\xdf\xcd\xa0/'),
  (0.44680851063829785,
   'hex+hex_sha256_rep24',
   'ascii+hex_sha1_rep16_16',
   b'+Z\x1fX?\x15\xf2\xa47\x19\xcbS6\xf0{\x1aV\x0f\xcd\xce\xab\xfa\x81\x0c\x8b\xd5I\xd8\x91#Df9\xb8\x02{7]y\xebt\xc4?\xdf\xcd\xa0/')],
 74)

Python

python
from Crypto.Util.Padding import pad
k=pad(key_s,16)
v=pad(iv_s,16)
k,v,len(k),len(v),k,v


(b'af16d2be89\x06\x06\x06\x06\x06\x06',
 b'1267c0a384\x06\x06\x06\x06\x06\x06',
 16,
 16,
 b'af16d2be89\x06\x06\x06\x06\x06\x06',
 b'1267c0a384\x06\x06\x06\x06\x06\x06')

Python

python
cipher=AES.new(k,AES.MODE_CBC,iv=v)
pt=cipher.decrypt(ct_raw)
pt[:32], pt


(b'4\x90\xed\x99#\xb5|\xc2\xdb\xa1\x7f\xa688\xee>E\xc5War\xaa\x16J\xc4D\x0e\x90\x90\xbcw\x8d',
 b'4\x90\xed\x99#\xb5|\xc2\xdb\xa1\x7f\xa688\xee>E\xc5War\xaa\x16J\xc4D\x0e\x90\x90\xbcw\x8d\xf8\x9a\x14\xc3Y\xc4\xb0IT.\x16\xdf\xcd\x08\x9c\r')

Python

python
unp=unpad(pt,16)
len(unp), unp

Python

python
from Crypto.Cipher import AES
best_ecb=[]
for kname,kb in keys:
    try:
        cipher=AES.new(kb, AES.MODE_ECB)
        pt=cipher.decrypt(ct_raw)
        for do_unpad in [True,False]:
            try:
                upt=unpad(pt,16) if do_unpad else pt
            except:
                continue
            sc=extra_score(upt)
            best_ecb.append((sc,kname,do_unpad,upt))
    except Exception:
        continue
best_ecb_sorted=sorted(best_ecb,key=lambda x:x[0],reverse=True)
best_ecb_sorted[:10]


[(0.6041666666666666,
  'ascii+ascii_md5_rep16',
  False,
  b"\xb0\xb2Z{4\x10\xe6':\xe8^3\xdf8\xe8\xa0qWS\xba\xa68JF\nP\xf5euC!\xf9k\xcd\xdc@\xe7\x94i6c.\xd0\x1bz\xdcNE"),
 (0.5833333333333334,
  'asciixorascii_sha512_rep32',
  False,
  b'ne&\xf8m-\xdd\xbc\xb0\xc7\xbeSdvZ\x1d[S\xb35)~^\xed\x81\xd2_Z\xeeU:~\x89Iu\x10s`\x81\xa8\x88\xb3UU\x06Da\x95'),
 (0.5833333333333334,
  'hexxorascii_sha512_rep16',
  False,
  b'a\x85:K\x1d\xe534F1[]~DvTp\x18vz\x95\x0bu$\x8b\xdd]\xbc]\x1c\xca\x7f\xaf\xb3r\x18a\xc0\x18g3s\xb0\xc7v\xb8=g'),
 (0.5416666666666666,
  'ascii+ascii_md5_rep16',
  False,
  b"\xd5\xd3^\xf5\xd8n\xec\xad\n-7\xd1\xb9qvn\xa2G\x99^\x1fL\xdd\x7f:\x18C~6.\xd8q$\nt\xf8\x98!)s'\xfb\n\xe5\x9fi\x7f\x1d"),
 (0.5416666666666666,
  'hexxorascii_pad016',
  False,
  b"O\x1e\xe3\xed\xcd\xe4\x0bQ:\xb2@:H\\\x17\x11\xa3o\x81z^31\xa2\x157MB\xb9\xd7\x1b8\x871n_*x(\xa9\xecS'\xa4%\xc8@\xe5"),
 (0.5416666666666666,
  'hex+hex_md5_pad032',
  False,
  b'\xb2r\xecM>\xfct\xe2s3_y\xd3\xc6fU\xef\xf2tq\xb9c\x1d+?"\xc3,\r^\xa5b\xf0\xe1xh3!\xbf\x84\xa6\x18\x9c\xebP=\xa8\xb3'),
 (0.5208333333333334,
  'hexxorascii_pad024',
  False,
  b"\xd6\x8b\x12e\xf0iGp8XvC\xa3\xafg\xfe}g?S\xb9'\x010\x84TUSP\xc6\xaaUs\x16F\x8c\x0fO\xd6\t\xa2\x1b\xd5\xb2\x0b\xf5\xae2"),
 (0.5,
  'ascii_sha512_rep32',
  False,
  b'\x14<\xca\xc7\x8bE?hzn\x02\xf2@(a\x00hze#5)\x9d\xe7H~\xefp\x8e\xe3op\x02\xef\xf1\xa3\x08H)\xb5\x01\xcc\xdb1\xb08\x11\xa8'),
 (0.5,
  'ascii+ascii_sha1_pad024',
  False,
  b'\xcfU\x05 *0\x16\xf8tSy\xccC6\xdeh\xc31Y\x9c\xaf\xc6\x1b\x19n(P\x02\x97\xcc\xbeV\r\xc7q\x94\x99}\xf7].\x1e\xac\x9b$-\x1c}'),
 (0.5,
  'ascii+hex_sha256_rep24',
  False,
  b'PO\xfe\x1a\xd24BW\xe3\x82\xd0?qr\x1e\x03W\xab\xef\xaa\x03\x15#\x1ar\x85i$\xca$\xf3mf~\x87,I^/\xf5\xb9[\x8e\x16Q\xcd"\xa7')]

Python

python
hexstr=raw.hex()
hexstr, len(hexstr)


('cf08a0746bd20f8c219e5540beac9e4f285e05849700bc7c266ba4983d00ba7b363d9f303756f5eaf0adb3574d202243',
 96)

Gedanke

Interpreting the ciphertext and key/iv assumptions

The ciphertext has a hex length of 96 characters, which we can break into 3 blocks, indicating AES-CBC. The key and iv are typically 16 bytes in AES, but here, the key appears to be 10 bytes, so I may need to derive it using methods like MD5. I'll provide decoding suggestions based on this while requesting clarity at the end.

Thought for 2m 48s

Antwort

你这个 ciphertext 看起来是 Base64 字符串（不是直接的二进制密文）。把它 Base64 解码后，才能得到“真正的密文字节”。

1) Base64 解码后的密文结果

  • Base64 解码后长度：48 bytes（正好是 16 的倍数 = 3 个 16-byte block，常见于 AES 这类 16 字节分组算法）
  • 十六进制（hex）表示的真实密文是：

cf08a0746bd20f8c219e5540beac9e4f285e05849700bc7c266ba4983d00ba7b363d9f303756f5eaf0adb3574d202243

按 16 字节分块（每块 32 个 hex 字符）：

  1. cf08a0746bd20f8c219e5540beac9e4f
  2. 285e05849700bc7c266ba4983d00ba7b
  3. 363d9f303756f5eaf0adb3574d202243

2) 你给的 key/iv 需要注意

你写的是：

  • key = b'af16d2be89' → 这是 10 字节的 ASCII（内容是字符 a f 1 6 ...），不是 0xaf 这种“hex字节”
  • iv = b'1267c0a384' → 同理也是 10 字节 ASCII

而常见的 AES-CBC/AES-CTR 需要：

  • key：16/24/32 字节
  • iv/nonce：通常 16 字节（CBC）或 8~16（CTR/GCM/CCM 视实现）

所以仅靠你给的 key/iv/ciphertext 还无法唯一解密出明文，除非你确定：用的是什么算法/模式，以及 key/iv 是怎么从这两个字符串变成合规长度的（比如补零、重复、MD5/SHA256 派生等）。

3) 直接得到“密文字节”的 Python 代码

python
import base64

ciphertext_b64 = "zwigdGvSD4whnlVAvqyeTyheBYSXALx8JmukmD0Auns2PZ8wN1b16vCts1dNICJD"
ct = base64.b64decode(ciphertext_b64)

print("len:", len(ct))
print("hex:", ct.hex())

# 16-byte blocks
for i in range(0, len(ct), 16):
    print(i//16, ct[i:i+16].hex())

如果你接下来把加密算法/模式/填充方式说一下（例如：AES-CBC/PKCS7、AES-CTR、AES-GCM 等，以及 key/iv 是直接用、补零、还是 hash 生成），我就可以把解密脚本也给你并直接算出明文。

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