霍雅
追求源于热爱，极致源于梦想！
第三届黄河流域公安院校网络安全技能挑战赛huoya wp
05/26
PCC
001
002
import pandas as pd
from collections import defaultdict
def find_common_contacts(target_numbers, call_records_df):
contacts = defaultdict(set)
for _, row in call_records_df.iterrows():
caller = str(row['本机号码']).strip()
receiver = str(row['对方号码']).strip()
if caller in target_numbers:
contacts[caller].add(receiver)
if receiver in target_numbers:
contacts[receiver].add(caller)
# 调试输出每个号码的联系人
print("\n各目标号码联系人统计:")
for num in target_numbers:
print(f"{num}: {len(contacts.get(num, set()))} contacts")
common_contacts = set.intersection(*[contacts.get(num, set()) for num in target_numbers])
return common_contacts
def main():
target_numbers = [
'135****2345',
'138****7383',
'153****9888',
'155****7991',
'157****0947',
'170****5678'
]
try:
call_records_df = pd.read_excel('2.xlsx', sheet_name='Sheet1')
required_cols = {'本机号码', '对方号码'}
if not required_cols.issubset(call_records_df.columns):
missing = required_cols - set(call_records_df.columns)
raise ValueError(f"缺少必要列: {missing}")
call_records_df = call_records_df.drop_duplicates()
call_records_df['本机号码'] = call_records_df['本机号码'].astype(str).str.strip()
call_records_df['对方号码'] = call_records_df['对方号码'].astype(str).str.strip()
common_numbers = find_common_contacts(target_numbers, call_records_df)
print("\n共同联系人结果:")
if common_numbers:
for num in sorted(common_numbers):
print(num)
else:
print("※ 未找到共同联系人 ※")
except Exception as e:
print(f"程序错误: {str(e)}")
if __name__ == "__main__":
main()
reverse
Victory Melody
分析发现 先经过sub_7FF76AFD1109再经过vm
sub申请了一个地址存放code
vm其实就实现了个异或的功能
让ai写个解释器
code = bytes.fromhex(
"20105B20115820125620136E20141120154E201600401121100030100130100230100330100430100530100630100730501007" # 假设 0x50 后跟两个参数 0x10 和 0x05)
# 初始化虚拟机状态
reg0 = 0
reg1 = 0
pc = 0
memory = [0] * 0x50C # 1292 字节内存块
while pc < len(code):
op = code[pc]
print(f"PC: {hex(pc).ljust(6)} OP: {hex(op).ljust(4)}", end=" | ")
if op == 0x10:
reg0 = code[pc + 1]
print(f"MOV reg0, {hex(reg0)}")
pc += 2
elif op == 0x11:
reg1 = code[pc + 1]
print(f"MOV reg1, {hex(reg1)}")
pc += 2
elif op == 0x20:
addr = code[pc + 1]
val = code[pc + 2]
memory[12 + addr] = val
print(f"MOV [data+{hex(addr)}], {hex(val)}")
pc += 3
elif op == 0x30:
memory[12 + reg0] ^= reg1
print(f"XOR [data+{hex(reg0)}], {hex(reg1)} → {hex(memory[12 + reg0])}")
pc += 1
elif op == 0x40:
print("CALL sub_7FF76AFD109B()")
pc += 1
elif op == 0x50:
offset = code[pc + 1]
length = code[pc + 2]
print(f"COMPARE data[0:{hex(length)}] vs data[{hex(offset)}:{hex(offset + length)}]")
# 提取 Flag（假设数据区前 length 字节为解密后的明文）
flag_bytes = bytes(memory[12: 12 + length])
print(f"Possible Flag: {flag_bytes.decode()}")
exit()
else:
print(f"Unknown OP: {hex(op)}")
break
print("\nMemory Data Area (hex):")
print(bytes(memory[12:12 + 32]).hex(' '))得到伪汇编
PC: 0x0 OP: 0x20 | MOV [data+0x10], 0x5b
PC: 0x3 OP: 0x20 | MOV [data+0x11], 0x58
PC: 0x6 OP: 0x20 | MOV [data+0x12], 0x56
PC: 0x9 OP: 0x20 | MOV [data+0x13], 0x6e
PC: 0xc OP: 0x20 | MOV [data+0x14], 0x11
PC: 0xf OP: 0x20 | MOV [data+0x15], 0x4e
PC: 0x12 OP: 0x20 | MOV [data+0x16], 0x0
PC: 0x15 OP: 0x40 | CALL sub_7FF76AFD109B()
PC: 0x16 OP: 0x11 | MOV reg1, 0x21
PC: 0x18 OP: 0x10 | MOV reg0, 0x0
PC: 0x1a OP: 0x30 | XOR [data+0x0], 0x21 → 0x21
PC: 0x1b OP: 0x10 | MOV reg0, 0x1
PC: 0x1d OP: 0x30 | XOR [data+0x1], 0x21 → 0x21
PC: 0x1e OP: 0x10 | MOV reg0, 0x2
PC: 0x20 OP: 0x30 | XOR [data+0x2], 0x21 → 0x21
PC: 0x21 OP: 0x10 | MOV reg0, 0x3
PC: 0x23 OP: 0x30 | XOR [data+0x3], 0x21 → 0x21
PC: 0x24 OP: 0x10 | MOV reg0, 0x4
PC: 0x26 OP: 0x30 | XOR [data+0x4], 0x21 → 0x21
PC: 0x27 OP: 0x10 | MOV reg0, 0x5
PC: 0x29 OP: 0x30 | XOR [data+0x5], 0x21 → 0x21
PC: 0x2a OP: 0x10 | MOV reg0, 0x6
PC: 0x2c OP: 0x30 | XOR [data+0x6], 0x21 → 0x21
PC: 0x2d OP: 0x10 | MOV reg0, 0x7
PC: 0x2f OP: 0x30 | XOR [data+0x7], 0x21 → 0x21
PC: 0x30 OP: 0x50 | COMPARE data[0:0x7] vs data[0x10:0x17]其实就是
0x5b
0x58
0x56
0x6e
0x11
0x4e
0x00
分别去异或0x21
encData = [0x5b,
0x58,
0x56,
0x6e,
0x11,
0x4e,
0x00]
for i in range(len(encData)):
encData[i] ^= 0x21
print(hex(encData[i]), end=',')
qgd
使用相同版本解包
使用在线网站反编译pyc
https://pylingual.io/view_chimera?identifier=e1e242bc1aeb643b49d3f18d520a73102793aa016adac62812cda4248f635a08
发现导了一个secret
解包secret得到一个魔改rc4
因为rc4是对称加密，加解密都是同一个函数直接全部复制下来就行
# Decompiled with PyLingual (https://pylingual.io)
# Internal filename: secret.py
# Bytecode version: 3.9.0beta5 (3425)
# Source timestamp: 1970-01-01 00:00:00 UTC (0)
def key_schedule(key: bytes) -> list:
S = list(range(128))
v6 = 0
for j in range(128):
v6 = (S[j] + key[j % len(key)] + v6) % 128
v6 = (v6 ^ 55) % 128
S[j], S[v6] = (S[v6], S[j])
return S
def next_byte(state: dict) -> int:
S = state['S']
state['i'] = (state['i'] + 1) % 128
state['j'] = (state['j'] + S[state['i']]) % 128
S[state['i']], S[state['j']] = (S[state['j']], S[state['i']])
v2 = S[(S[state['i']] + S[state['j']]) % 128]
return (16 * v2 | v2 >> 4) & 255
def decrypt(ciphertext: bytes, key: bytes) -> bytes:
state = {'S': key_schedule(key), 'i': 0, 'j': 0}
plaintext = bytearray()
for byte in ciphertext:
plaintext.append(byte ^ next_byte(state))
return bytes(plaintext)
key = bytes.fromhex('EC3700DFCD4F364EC54B19C5E7E26DEF6A25087C4FCDF4F8507A40A9019E3B48BD70129D0141A5B8F089F280F4BE6CCD')
ciphertext = b'\xd4z\'0L\x10\xca\x0b\x0b\xaa\x15\xbeK0"\xbf\xb2\xc6\x05'
cipher = decrypt(ciphertext, key)
print(ciphertext)
print(cipher)
F:\python3\Scripts\python.exe "F:\真题\第三届黄河流域\题目\题目\reverse\re(2)\qgd\1..py"
b'\xd4z\'0L\x10\xca\x0b\x0b\xaa\x15\xbeK0"\xbf\xb2\xc6\x05'
b'what_DO_you_mean#@!'
进程已结束，退出代码为 0
前半段给ai分析
得到flag{iwannaknow/what_DO_you_mean#@!}
misc
数学天才
数独求解，左上角的值是框中加起来的
根据提示：斜下对角线的数字
手搓数独295425423
试炼二：为师不想要死，为师喜欢$。
可以猜出4=$，密码就是
295$25$23
随波逐流嗦
small_challenge
随波逐流foremost分离
得到一个压缩包和一个图片
双图xor一下
扫码得到
随波逐流嗦一下，发现base85有东西
UV!W_X_YZ,U,Y∈[0,9], V,W,X,Z∈[A,z]
发现这是一个带有集合和条件的东西
猜测可能为压缩包的掩码
自定义掩码爆一下
crypto
Lattice
import numpy as np
from Crypto.Cipher import AES
from Crypto.Util.Padding import unpad
# 给定数据
P = [[87, -27, -52, -29], [57, -41, -24, -60], [76, -17, -55, -37], [75, -46, -33, -21], [121, -55, -33, -34],
[47, -4, -34, -45], [112, -33, -44, -16], [74, -44, -5, -25], [20, -21, -16, -49], [89, -21, -54, -24],
[18, -23, -53, -1], [35, -40, -4, -29], [105, -54, -2, -8], [44, -24, -43, -36], [111, -15, -15, -54]]
C = [[24, 75, 81, 85], [24, 14, 85, 102], [115, 1, 5, 21], [58, 118, 104, 77], [65, 42, 101, 103], [33, 38, 50, 67],
[7, 81, 38, 58], [117, 101, 54, 11], [44, 29, 81, 8], [59, 114, 70, 121], [62, 13, 9, 105], [11, 43, 97, 23],
[39, 82, 75, 97], [122, 113, 14, 30], [70, 102, 116, 5], [58, 44, 61, 20], [73, 119, 59, 28], [119, 68, 57, 122],
[61, 91, 83, 44], [103, 29, 1, 73], [47, 60, 120, 125], [17, 126, 14, 21], [104, 8, 78, 123], [72, 121, 54, 74],
[48, 104, 49, 66], [72, 56, 27, 69], [34, 110, 41, 54], [33, 54, 74, 44], [70, 65, 11, 113], [122, 3, 69, 35],
[58, 7, 39, 64], [59, 106, 49, 66], [77, 92, 87, 92], [95, 21, 96, 83], [67, 55, 30, 73], [99, 54, 18, 90],
[101, 102, 126, 107], [81, 46, 104, 83], [38, 24, 94, 60], [114, 105, 76, 97], [22, 115, 20, 67],
[40, 72, 110, 65], [111, 92, 106, 117], [5, 123, 21, 96], [41, 14, 23, 114], [113, 75, 43, 65], [56, 3, 61, 48],
[40, 101, 16, 114], [42, 84, 95, 13], [36, 110, 91, 107], [4, 13, 60, 74], [24, 80, 125, 76], [123, 26, 27, 119],
[31, 87, 6, 123], [61, 106, 73, 120], [66, 10, 36, 65], [91, 38, 46, 9], [121, 20, 106, 48], [123, 21, 78, 27],
[22, 74, 55, 110], [47, 49, 118, 76], [30, 10, 16, 118], [43, 19, 52, 61], [100, 9, 37, 35], [20, 102, 111, 94],
[116, 63, 55, 43], [13, 110, 42, 14], [46, 65, 71, 28], [82, 5, 76, 74], [86, 34, 117, 84], [28, 44, 82, 50],
[76, 79, 77, 11], [68, 39, 51, 89], [83, 93, 95, 2], [54, 108, 101, 82], [99, 90, 122, 37], [16, 92, 79, 12],
[67, 86, 24, 36], [80, 94, 106, 59], [50, 56, 95, 98], [33, 68, 89, 40], [74, 124, 14, 82], [88, 93, 54, 93],
[51, 17, 124, 31], [17, 17, 45, 35], [113, 71, 76, 44], [48, 6, 120, 4], [36, 91, 108, 11], [2, 41, 58, 72],
[42, 59, 51, 81], [73, 22, 79, 27], [85, 35, 29, 98], [76, 76, 37, 22], [82, 29, 42, 27], [75, 114, 37, 106],
[40, 69, 53, 73], [39, 44, 33, 121], [94, 85, 92, 54], [91, 77, 124, 46], [108, 31, 101, 84], [35, 33, 97, 45],
[99, 32, 17, 14], [1, 66, 11, 35], [78, 100, 95, 81], [73, 49, 14, 37], [70, 9, 107, 2], [84, 98, 92, 62],
[123, 87, 87, 110], [3, 81, 111, 28], [20, 2, 91, 37], [93, 101, 77, 93], [27, 16, 31, 105], [95, 81, 87, 17],
[10, 103, 21, 102], [81, 57, 118, 82], [15, 92, 60, 71], [16, 84, 126, 49], [35, 26, 2, 120], [70, 86, 45, 9],
[29, 8, 40, 66], [99, 77, 14, 9], [12, 70, 50, 52], [21, 21, 85, 54], [91, 94, 100, 85], [9, 42, 47, 14],
[117, 55, 17, 99], [53, 45, 4, 72], [49, 10, 27, 121], [108, 61, 73, 42], [121, 42, 41, 71], [49, 63, 50, 117],
[5, 78, 24, 101], [0, 117, 21, 46], [90, 43, 47, 32], [74, 85, 118, 84], [13, 73, 18, 66], [95, 24, 120, 18],
[94, 21, 111, 34], [66, 68, 80, 21], [102, 49, 57, 55], [25, 85, 107, 98], [8, 18, 88, 12], [18, 6, 86, 82],
[18, 91, 126, 115], [26, 11, 30, 35], [88, 78, 76, 74], [51, 75, 76, 15], [60, 24, 72, 27], [91, 72, 44, 104],
[84, 113, 39, 116], [41, 83, 91, 74], [84, 17, 94, 119], [46, 95, 85, 5], [109, 58, 71, 42], [126, 29, 114, 73],
[27, 70, 7, 125], [121, 66, 97, 111], [8, 21, 10, 57], [15, 62, 65, 8], [101, 79, 32, 74], [69, 42, 38, 58],
[65, 81, 72, 16], [20, 81, 1, 126], [91, 111, 69, 33], [56, 84, 65, 66], [47, 78, 43, 100], [43, 90, 80, 25],
[46, 55, 10, 60], [116, 110, 49, 116], [72, 115, 38, 104], [79, 43, 74, 106], [86, 113, 84, 76], [102, 2, 119, 3],
[126, 25, 83, 44], [37, 83, 46, 40], [13, 75, 101, 101], [76, 93, 3, 63], [69, 9, 84, 37], [103, 47, 106, 80],
[72, 104, 85, 19], [124, 118, 34, 81], [57, 25, 52, 119], [44, 56, 63, 90], [123, 46, 124, 31], [19, 116, 23, 77],
[126, 78, 37, 93], [34, 95, 43, 98], [37, 90, 32, 97], [106, 8, 80, 8], [90, 5, 113, 68], [99, 40, 39, 18],
[90, 37, 48, 45], [56, 13, 76, 6], [68, 33, 52, 102], [62, 45, 29, 123], [100, 21, 73, 92], [92, 18, 118, 23],
[84, 86, 42, 83], [107, 8, 71, 52], [114, 106, 78, 85], [10, 120, 115, 119], [27, 49, 124, 16], [65, 40, 48, 37],
[69, 42, 8, 29], [35, 39, 55, 102], [58, 19, 41, 75], [17, 2, 113, 12], [8, 34, 72, 75], [91, 32, 19, 52],
[62, 50, 109, 78], [9, 115, 35, 50], [42, 83, 78, 41], [34, 94, 97, 58], [56, 73, 25, 115], [55, 12, 16, 86],
[97, 95, 30, 92], [47, 105, 70, 68], [50, 18, 51, 23], [46, 57, 80, 29], [4, 66, 123, 24], [55, 53, 26, 36],
[71, 59, 104, 91], [94, 3, 1, 34], [57, 8, 85, 102], [89, 73, 115, 25], [13, 38, 81, 76], [104, 30, 81, 104],
[55, 101, 95, 101], [69, 65, 5, 11], [123, 105, 84, 125], [38, 110, 4, 28], [112, 115, 92, 71], [90, 120, 112, 39],
[50, 18, 107, 71], [95, 63, 118, 93], [93, 111, 59, 55], [17, 15, 2, 88], [78, 126, 37, 12], [56, 112, 53, 12],
[65, 34, 82, 100], [9, 94, 72, 99], [78, 76, 43, 91], [7, 88, 107, 31], [43, 91, 97, 4], [113, 112, 36, 15],
[8, 97, 23, 84], [65, 92, 31, 63], [54, 38, 119, 103], [89, 50, 57, 50], [61, 37, 87, 0], [21, 35, 44, 22],
[20, 32, 95, 116], [10, 94, 103, 84], [59, 29, 7, 50], [98, 33, 87, 33], [7, 96, 36, 67], [85, 10, 35, 98],
[65, 49, 19, 62], [56, 67, 14, 91], [30, 49, 111, 77], [121, 49, 108, 119], [89, 67, 115, 69], [65, 8, 0, 82],
[117, 57, 117, 23], [23, 38, 2, 98], [60, 28, 94, 93], [23, 65, 8, 114], [121, 105, 122, 40], [120, 12, 21, 112],
[55, 51, 2, 77], [48, 41, 113, 62], [66, 82, 117, 119], [4, 15, 5, 21], [41, 14, 12, 80], [23, 61, 106, 16],
[23, 53, 122, 68], [6, 54, 5, 101], [69, 49, 7, 79], [17, 70, 64, 88], [103, 30, 76, 31], [108, 82, 90, 109],
[55, 56, 113, 37], [93, 99, 126, 44], [1, 46, 105, 124], [55, 54, 35, 115], [0, 89, 53, 97], [67, 111, 107, 80],
[92, 122, 40, 64], [75, 2, 126, 118], [90, 84, 43, 74], [101, 69, 60, 17], [104, 10, 4, 122], [94, 4, 115, 91],
[15, 11, 111, 105], [9, 7, 32, 101], [77, 18, 55, 56], [66, 7, 117, 108], [116, 121, 33, 66], [32, 41, 83, 125],
[60, 52, 70, 58], [125, 54, 93, 15], [70, 19, 10, 58], [83, 94, 61, 126], [95, 85, 80, 44], [25, 89, 117, 74],
[12, 17, 63, 87], [118, 80, 96, 26], [6, 97, 79, 38], [97, 3, 107, 95], [7, 82, 106, 92], [83, 100, 119, 95],
[81, 26, 99, 56], [25, 60, 51, 122], [56, 18, 22, 84], [9, 72, 107, 114], [80, 97, 92, 52], [108, 47, 58, 46],
[9, 47, 7, 47], [115, 68, 91, 7], [14, 120, 87, 122], [97, 15, 40, 79], [5, 92, 85, 93], [4, 97, 73, 63],
[25, 22, 92, 108], [88, 4, 34, 86], [0, 43, 21, 57], [67, 90, 36, 50], [15, 126, 37, 12], [92, 73, 96, 71],
[76, 107, 27, 115], [79, 8, 68, 55], [38, 12, 120, 126], [54, 46, 7, 69], [72, 114, 93, 60], [59, 98, 27, 102],
[50, 76, 87, 19], [77, 107, 29, 40], [36, 73, 21, 123], [36, 89, 82, 74], [24, 73, 118, 86], [58, 89, 115, 106],
[12, 27, 33, 72], [28, 94, 21, 26], [0, 79, 48, 110], [72, 62, 82, 57], [65, 84, 114, 97], [80, 68, 52, 52],
[119, 35, 103, 101], [10, 67, 68, 69], [101, 17, 54, 40], [98, 46, 21, 42], [30, 39, 56, 118], [27, 33, 77, 114],
[66, 74, 61, 63], [23, 13, 14, 47], [88, 30, 122, 119], [15, 58, 55, 52], [56, 27, 47, 45], [119, 95, 59, 14],
[84, 69, 5, 83], [21, 35, 39, 36], [10, 92, 68, 17], [79, 67, 111, 38], [36, 1, 4, 117], [117, 30, 5, 7],
[112, 15, 115, 123], [54, 47, 18, 93], [102, 111, 3, 68], [91, 91, 5, 44], [123, 118, 57, 32], [12, 121, 31, 103],
[114, 52, 105, 12], [100, 28, 117, 102], [51, 42, 12, 124], [47, 1, 42, 47], [28, 3, 22, 100], [103, 105, 119, 24],
[101, 59, 13, 78], [79, 36, 61, 54], [11, 46, 75, 116], [31, 73, 118, 0], [92, 32, 0, 124], [77, 85, 25, 90],
[29, 21, 74, 7], [3, 66, 11, 8], [112, 91, 50, 53], [45, 113, 99, 123], [35, 65, 85, 22], [108, 99, 42, 1],
[103, 113, 116, 72], [125, 74, 112, 24], [75, 79, 80, 12], [83, 44, 94, 86], [64, 20, 0, 8], [104, 126, 31, 120],
[85, 75, 61, 74], [36, 93, 36, 102], [70, 54, 101, 83], [90, 46, 109, 83], [112, 126, 114, 23], [16, 123, 97, 62],
[118, 86, 108, 53], [99, 18, 2, 18], [103, 3, 38, 8], [99, 49, 123, 81], [37, 75, 89, 53], [34, 77, 27, 122],
[29, 8, 40, 66], [119, 13, 64, 83], [4, 108, 116, 121], [49, 87, 1, 92], [15, 63, 80, 62], [27, 81, 100, 83],
[7, 90, 16, 0], [13, 50, 61, 65], [51, 64, 76, 5], [55, 100, 106, 66], [52, 102, 105, 2], [49, 34, 89, 116],
[24, 55, 11, 27], [91, 48, 73, 38], [27, 5, 1, 126], [66, 55, 80, 19], [52, 118, 104, 43], [36, 1, 111, 60],
[65, 4, 34, 17], [54, 22, 0, 39], [52, 30, 64, 62], [26, 40, 32, 86], [93, 71, 41, 47], [77, 23, 15, 9],
[11, 20, 51, 31], [64, 50, 37, 50], [17, 49, 80, 37], [119, 115, 115, 50], [20, 86, 27, 5], [101, 65, 17, 78],
[56, 25, 125, 56], [16, 118, 2, 96], [114, 108, 69, 121], [14, 37, 76, 101], [113, 124, 121, 82],
[43, 120, 35, 94], [82, 67, 23, 43], [9, 79, 47, 122], [39, 28, 110, 31], [35, 48, 27, 16], [72, 8, 115, 66],
[54, 46, 122, 19], [77, 77, 30, 74], [58, 63, 81, 96], [6, 122, 75, 63], [115, 31, 119, 110], [82, 86, 89, 1],
[79, 100, 6, 110], [117, 67, 15, 13], [4, 15, 63, 0], [106, 108, 122, 107], [34, 72, 0, 114], [20, 0, 32, 56],
[121, 104, 66, 3], [86, 28, 76, 84], [85, 9, 60, 45], [95, 80, 78, 65], [39, 85, 50, 49], [42, 103, 36, 90],
[70, 99, 116, 117], [34, 15, 40, 52], [24, 49, 19, 31], [98, 90, 95, 89], [63, 45, 40, 77], [114, 14, 30, 106],
[10, 35, 116, 9], [103, 111, 112, 16], [71, 112, 71, 32], [77, 31, 105, 64], [84, 87, 24, 67], [1, 27, 123, 57],
[104, 29, 87, 123], [110, 39, 67, 7], [28, 70, 108, 113], [96, 9, 101, 36], [13, 28, 6, 13], [69, 81, 89, 26],
[79, 113, 77, 91], [112, 62, 104, 117], [109, 95, 55, 83], [78, 68, 98, 14], [73, 79, 96, 12], [108, 39, 97, 49],
[27, 111, 106, 100], [82, 70, 9, 36], [48, 31, 90, 70], [99, 92, 45, 35], [55, 100, 31, 37], [75, 17, 69, 35],
[12, 38, 119, 112], [103, 34, 63, 76], [26, 19, 91, 111], [74, 122, 12, 78], [64, 117, 16, 60], [2, 97, 122, 106],
[62, 79, 56, 30], [71, 47, 13, 22], [38, 78, 116, 16], [87, 28, 94, 76], [77, 126, 94, 116], [83, 46, 104, 90],
[5, 95, 13, 26], [47, 10, 46, 115], [82, 19, 91, 70], [111, 72, 49, 65], [18, 103, 59, 72], [17, 37, 56, 24],
[19, 120, 24, 64], [28, 40, 11, 20], [18, 19, 80, 62], [37, 11, 74, 14], [109, 97, 75, 72], [116, 65, 52, 121],
[95, 63, 82, 122], [88, 93, 54, 93], [77, 30, 65, 121], [99, 121, 42, 87], [62, 52, 44, 6], [79, 60, 55, 4],
[96, 64, 6, 20], [94, 114, 90, 8], [123, 98, 29, 27], [116, 84, 31, 80], [9, 77, 45, 45], [120, 33, 63, 15],
[51, 44, 66, 25], [2, 46, 72, 94], [107, 113, 50, 46], [115, 64, 126, 85], [64, 10, 28, 78], [84, 112, 64, 103],
[59, 114, 15, 82], [65, 122, 104, 89], [113, 122, 21, 11], [69, 106, 19, 78], [42, 93, 125, 0], [7, 123, 82, 70],
[103, 114, 62, 92], [15, 30, 78, 114], [4, 78, 111, 60], [40, 80, 34, 55], [3, 87, 120, 27], [122, 64, 3, 122],
[24, 49, 31, 81], [26, 43, 100, 19], [52, 78, 2, 97], [116, 45, 15, 33], [21, 119, 92, 86], [28, 118, 71, 24],
[106, 15, 0, 79], [36, 4, 52, 73], [22, 43, 8, 60], [96, 22, 9, 100], [19, 64, 26, 96], [97, 61, 22, 39],
[6, 112, 76, 38], [58, 6, 97, 94], [103, 87, 87, 101], [17, 49, 80, 37], [117, 33, 26, 8], [59, 108, 78, 91],
[113, 28, 30, 44], [119, 78, 72, 20], [49, 101, 77, 2], [26, 18, 35, 7], [34, 38, 99, 37], [45, 52, 90, 27],
[108, 31, 118, 67], [3, 37, 29, 88], [111, 96, 12, 111], [91, 111, 106, 100], [52, 78, 117, 80], [14, 51, 87, 0],
[1, 52, 116, 1], [117, 2, 33, 48], [57, 0, 48, 34], [59, 14, 84, 63], [82, 83, 8, 82], [58, 100, 32, 33],
[75, 29, 112, 103], [0, 49, 45, 54], [94, 9, 51, 110], [54, 61, 27, 47], [88, 89, 23, 37], [73, 43, 0, 32],
[123, 6, 35, 78], [73, 72, 119, 64], [81, 46, 11, 102], [42, 124, 47, 8], [50, 66, 3, 40], [116, 7, 51, 20],
[47, 112, 99, 7], [42, 37, 86, 89], [18, 74, 78, 101], [57, 85, 75, 7], [26, 90, 35, 10], [72, 126, 10, 77],
[55, 12, 5, 78], [37, 87, 85, 96], [91, 9, 114, 68], [79, 76, 44, 20], [84, 52, 63, 56], [95, 9, 22, 117],
[96, 38, 50, 67], [43, 114, 45, 56], [94, 21, 74, 107], [92, 82, 81, 71], [40, 10, 10, 90], [20, 18, 15, 56],
[72, 2, 30, 22], [50, 31, 123, 20], [85, 40, 115, 115], [93, 1, 48, 47], [111, 118, 45, 34], [9, 122, 37, 121],
[60, 27, 77, 41], [122, 38, 22, 39], [115, 66, 74, 126], [77, 67, 90, 78], [96, 3, 53, 52], [5, 26, 120, 101],
[45, 100, 72, 6], [106, 56, 87, 77], [52, 68, 102, 95], [1, 13, 36, 33], [58, 27, 35, 8], [52, 5, 38, 35],
[102, 82, 63, 47], [24, 71, 119, 43], [11, 36, 90, 13], [11, 93, 27, 23], [4, 107, 26, 125], [85, 9, 5, 13],
[116, 25, 55, 119], [73, 82, 73, 2], [40, 123, 77, 41], [10, 98, 51, 111], [23, 79, 120, 54], [56, 18, 22, 84],
[61, 115, 51, 109], [33, 5, 12, 121], [8, 81, 35, 70], [22, 39, 103, 2], [38, 74, 66, 126], [83, 20, 117, 85],
[8, 32, 91, 98], [37, 31, 94, 119], [7, 30, 45, 43], [68, 16, 124, 97], [86, 124, 37, 21], [29, 101, 15, 30],
[27, 31, 52, 45], [47, 37, 102, 3], [117, 49, 54, 89], [48, 94, 126, 66], [42, 115, 63, 104], [14, 74, 6, 112],
[68, 125, 4, 5], [66, 3, 78, 52], [108, 33, 6, 77], [77, 99, 16, 52], [61, 78, 73, 70], [108, 106, 124, 0],
[23, 35, 119, 118], [125, 124, 37, 65], [69, 30, 61, 110], [77, 10, 120, 118], [53, 121, 24, 30], [87, 32, 29, 63],
[54, 64, 1, 3], [16, 59, 104, 25], [30, 6, 59, 102], [43, 120, 35, 94], [89, 13, 69, 39], [87, 78, 100, 14],
[83, 17, 14, 4], [24, 49, 31, 81], [73, 32, 72, 10], [0, 22, 61, 54], [81, 42, 70, 13], [108, 56, 52, 2],
[25, 99, 116, 72], [66, 23, 18, 102], [121, 115, 47, 12], [96, 37, 123, 48], [64, 69, 4, 39], [78, 38, 124, 31],
[27, 69, 10, 70], [5, 29, 2, 85], [30, 45, 56, 7], [31, 25, 120, 61], [36, 89, 89, 118], [98, 63, 18, 21],
[121, 83, 36, 57], [60, 5, 86, 17], [121, 55, 117, 58], [12, 96, 4, 27], [119, 63, 124, 37], [96, 27, 45, 91],
[42, 119, 8, 103], [104, 42, 68, 37], [104, 55, 41, 38], [120, 3, 50, 87], [120, 121, 20, 67], [58, 123, 50, 28],
[103, 62, 58, 20], [97, 27, 89, 102], [7, 51, 56, 108], [73, 60, 10, 77], [56, 72, 103, 69], [101, 89, 18, 66],
[115, 35, 80, 36], [98, 103, 39, 63], [29, 126, 67, 76], [27, 97, 15, 79], [36, 6, 17, 90], [126, 54, 101, 42],
[115, 66, 74, 126], [78, 80, 62, 83], [60, 11, 31, 88], [16, 73, 108, 13]]
q = 127
key = b'\x8fj\x94\x98-\x1fd\xd5\x89\xbe\xa9*Tu\x90\xb7'
encrypted = b'\x9fT@\xbc\x82\x8esQ\x1e\xd8\x1d\xdb\x9b\xb4\xf8rU\xc8\xa0\xcb\xaf H\xa9.\x04\x1e\xd2\x92\x1f\x0fBja-\x965x\xa8@\xc9x\xf9\xaf\x87\xd1\xa5}\xfc\x1b\xe0#\xc3m\xc9\x8973\x1c\x1f\x13\x8f\xb2a\xae\xa9]\xb9\xc2\xe8\x83A\x80\x13g\xc9a\x1c<\x8a\x9c&\xd9\xbd\x06\xef\xba9\xb0\x03\x9f\x022\xc9\x13\x9a\xffXPG\xc6o\xc0\xeaV7)XG9L\x84N7U\xe3Wn0G\x8e\xd3\x04(\n\x08\xb9\x17\xe6\xf1\xaa\xb7\x8a@$\x16\x13\x06A\x00\xc9Z\xdf\x7fQ\xc9\x08\xb4\xf3P\xfcpe\xe2\xeb\x96\x0e(-\xde\x17\xd1\x01\x1c_\x82\x8b\x9fw\xc8\x86\xfbw\xb5\xf7\xd0\xc8\x1784\xe3?\x00\x0b.)\xb7\xbc\x8e{\xe0\xae\x8d$\x0f\x19\'\xb6\xee@d\x00\xd9\x84\x8c\x0e\xa3,\xc6a\xa3\xba*1\xfd<\xfd\x18\xd6\x9e\x8c4\x8e#\xfd\xbd&0R\xeddE,\xed\xb6\x1e\x00\x11\xa6K\xd3\x1dT\x8c5\x8e\x00\xea\x10\xe9\'u"B#\xa1#\xd8\xe3\xf5j\xbc\x94M\xda\xe3\xcb*\xf0W1\xa0\x80\x1d\xfc\xbfo\x01?(da\r\xb6\x86\xd0\x90\x88Z\xa1`B\x89\x89\x89\xb3v\xa5\xf0\xe0\x0c\x8e\xcc+P\xfc\xfd#\x83\xe9\x93\x96\n\xf2\xa5\xfb\xc3\xc5\xaa\x9e\x89\x93\xb6\xf5\xea\x8c%NY\xc3\x0eR\xfas\xa1\x13\xf2/*\xce\x8b_:_r\xeb\xbe\x0b\x8a\x8c\x97\x7f|m}\xae\xa9I\x95\xcc\xe7\x80\xa5yC4\x1f5\xa4P\xc5\xbf.\xf9V\xe8|\xbb\xc3\xcb\x98&\'JB\x99\x94\xc0\r$\x0b\xbe48u\xeb\xca\xa1\xfbb\xd8_R\x97\x8e\xaeI\xfc\xc2\xb2\xd2#@\xec\x16\xf1\xd7eCQ\x1cO\x13\xca\xb5\xd3\x1a\xb1\xf1_D\x80\x06\xa5\xbe\xbev\xbd\xd6\xbb\x9a\xc9x\x9cf:\xcb>\xa2\xe1\xcad\xde]aw\xa0\xdc\xb2\xb3{+\x85\x8d\x8b\xc5\rT\xcc\xd9X\xd5\x9b\r<\x99m\xb8b6s\xbfp\x0eo~\xe9&\xb2{\xbe\xee\x93\xd2N1\\\x94\x968IWO7\xcb\xb6e\x80\xf7\x9air\xb2~\x17\x1cF\x0f\x82T]RBX\xdex\x13\x85\xfa\xcd-\xce\xdc\xe4\xe5^\x99u\xb5\x01\xd0-\xc3C\xcd\xc4y6\xb7\x9d|L1\xe74\xf7\x8cH\xe9\xa9\xfav\n\xec;\xf2\xa2w\xfb\x13_b\r)z!\xa3\xc8\xa8\xc2\xd2\x10\x00\x11\x11\r\xb2&\xfb\x04&\x84">x6l[\x06n>\xa0\xbe\x9c`\xa7\x9e\xe0\xfb\x85\x91\xc4,\xcf\xac\xe11@a\xed3@\xfd}\x8e\xfaTp\xcb7\xe7\xbf\xd4\xe0~b\xd9\xe0<\xba\x81\xd4"e\xfc\x939|j#0H\x86\xf8\x0b\x03\xd2\xe8\xf5\xe55\xdc\xc8\x06\\\xb7)\xcc\x9b\'\xf12'
# 步骤 1：暴力破解私钥 sdef find_t():
equations = []
for row in P:
b_i = row[0]
a1 = -row[1]
a2 = -row[2]
a3 = -row[3]
equations.append((a1, a2, a3, b_i))
threshold = 3 # 误差阈值
for t1 in range(64):
for t2 in range(64):
for t3 in range(64):
valid = True
for a1, a2, a3, b in equations:
val = a1 * t1 + a2 * t2 + a3 * t3 - b
e_i = val % q
if e_i > q // 2:
e_i -= q
if abs(e_i) > threshold:
valid = False
break if valid:
return (t1, t2, t3)
return None
t = find_t()
if not t:
print("Failed to find t")
exit()
t1, t2, t3 = t
s = [1, t1, t2, t3]
print(f"Found s: {s}")
# 步骤 2：解密密文 CM_bits = []
for Ci in C:
product = sum(c * si for c, si in zip(Ci, s)) % q
if product > q // 2:
product -= q
distance_to_0 = abs(product)
distance_to_63 = abs(product - 63)
M_bits.append(1 if distance_to_63 < distance_to_0 else 0)
hint_bytes = []
for i in range(0, len(M_bits), 8):
bits = M_bits[i:i + 8]
if len(bits) < 8:
break
byte = 0
for bit in bits:
byte = (byte << 1) | bit
hint_bytes.append(byte)
hint = bytes(hint_bytes).decode('utf-8', errors='ignore')
print(f"Hint: {hint}")
# 步骤 3：提取 IV 并解密
# 假设 hint 包含 IV，例如 "iv=..."iv_str = hint.split('=')[1].strip()[:16].encode() # 示例提取 IViv = iv_str.ljust(16, b'\0')[:16] # 确保 IV 是 16 字节
cipher = AES.new(key, AES.MODE_CBC, iv)
decrypted = unpad(cipher.decrypt(encrypted), 16)
data = decrypted
visible_chars = ''.join([chr(b) for b in data if 32 <= b <= 126])
print(visible_chars)嗦出来的东西有点抽象，但是仔细观察有可见字符
提取可见字符
在原exp末尾加上
data = decrypted
visible_chars = ''.join([chr(b) for b in data if 32 <= b <= 126])
print(visible_chars)
