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MIT License GNU AFFERO GENERAL PUBLIC LICENSE
Version 3, 19 November 2007
Copyright (c) 2023 sangge Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
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* @Author: Smart-SangGe 2251250136@qq.com
* @Date: 2023-05-25 00:28:40
* @LastEditors: Smart-SangGe 2251250136@qq.com
* @LastEditTime: 2023-05-25 00:37:59
* @FilePath: \cryptopal\README.md
* @Description: README.md
-->
# cryptopal # cryptopal
## 介绍
这个仓库是由 Smart-SangGe 创建的，用于存放 [Cryptopal](https://cryptopals.com/) 网站中密码学习题的答案。
[博客版的wp](https://toothsome-cardamom-46e.notion.site/cryptopals-6c47921b219741919507d5d3fc09e447)
## 目录结构
本仓库的目录结构如下：
cryptopal
├── set1
│ ├── challenge1.py
│ ├── challenge2.py
│ └── ...
├── set2
│ ├── challenge1.py
│ ├── challenge2.py
│ └── ...
└── ...
每个 `set` 文件夹对应 Cryptopal 网站上的一组挑战题，每个挑战题的答案都存放在一个单独的 Python 文件中。
## 使用
你可以克隆这个仓库到你的本地电脑，然后运行 Python 文件查看每个挑战题的答案。
## 许可证
本仓库的内容遵循 GNU General Public License v3.0 协议。
## 作者
Smart-SangGe

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pycryptodome

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16
set1/challenge1.py Normal file
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'''
Author: Smart-SangGe 2251250136@qq.com
Date: 2023-05-23 22:17:57
LastEditors: Smart-SangGe 2251250136@qq.com
LastEditTime: 2023-05-23 22:18:36
FilePath: \cryptopal\set1\1.py
Description: 1
'''
import binascii
import base64
hex_string = "49276d206b696c6c696e6720796f757220627261696e206c696b65206120706f69736f6e6f7573206d757368726f6f6d"
binary_string = binascii.unhexlify(hex_string)
base64_string = base64.b64encode(binary_string)
print(base64_string.decode()) # 解码为字符串以便打印

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set1/challenge2.py Normal file
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'''
Author: Smart-SangGe 2251250136@qq.com
Date: 2023-05-23 22:20:41
LastEditors: Smart-SangGe 2251250136@qq.com
LastEditTime: 2023-05-23 22:21:08
FilePath: \cryptopal\set1\2.py
Description: 2
'''
import binascii
def xor_hex_strings(hex1, hex2):
# 解码十六进制字符串为字节
bytes1 = binascii.unhexlify(hex1)
bytes2 = binascii.unhexlify(hex2)
# 进行XOR操作
xor_bytes = bytes([b1 ^ b2 for b1, b2 in zip(bytes1, bytes2)])
# 将结果编码回十六进制字符串
xor_hex = binascii.hexlify(xor_bytes).decode()
return xor_hex
if __name__=='__main__':
hex1 = '1c0111001f010100061a024b53535009181c'
hex2 = '686974207468652062756c6c277320657965'
result = xor_hex_strings(hex1, hex2)
print(result)

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set1/challenge3.py Normal file
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'''
Author: Smart-SangGe 2251250136@qq.com
Date: 2023-05-24 14:00:42
LastEditors: Smart-SangGe 2251250136@qq.com
LastEditTime: 2023-05-24 14:05:11
FilePath: \cryptopal\set1\3.py
Description: 3
'''
import binascii
hex_str = "1b37373331363f78151b7f2b783431333d78397828372d363c78373e783a393b3736"
bytes_str = binascii.unhexlify(hex_str)
print(bytes_str)
for key in range(256):
decrypted = "".join(chr(b ^ key) for b in bytes_str)
print(f"{key}: {decrypted}")
# 88: Cooking MC's like a pound of bacon

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import binascii
with open("set1/4.txt",'r') as file:
lines = file.readlines()
hex_str = "".join(line.strip() for line in lines)
bytes_str = binascii.unhexlify(hex_str)
for key in range(256):
decrypted = "".join(chr(b ^ key) for b in bytes_str)
print(decrypted)
# 不知道为什么全部都是乱码

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def repeating_key_xor(key, message):
key_length = len(key)
message_length = len(message)
expanded_key = (key * (int(message_length / key_length))) + key[:message_length % key_length]
return bytes([m ^ k for m, k in zip(message, expanded_key)])
message = "Burning 'em, if you ain't quick and nimble\nI go crazy when I hear a cymbal"
key = "ICE"
# Convert message and key to bytes
message = message.encode('utf-8')
key = key.encode('utf-8')
cipher = repeating_key_xor(key, message)
# Convert to hexadecimal
cipher_hex = cipher.hex()
print(cipher_hex)

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from Crypto.Util.number import *
import base64
import statistics
def hamming_distance(str1: str, str2: str) -> int:
if len(str1) != len(str2):
raise ValueError("Input strings must have the same length")
hamming = bin(bytes_to_long(str1) ^ bytes_to_long(str2))
distance = 0
for one in hamming:
if one == '1':
distance = distance + 1
return distance
# a = b'this is a test'
# b = b'wokka wokka!!!'
# print(hamming_distance(a,b))
with open("set1/6.txt",'r') as file:
lines = file.readlines()
base64_str = "".join(line.strip() for line in lines)
cipher = base64.b64decode(base64_str)
# variances = [99]
# for key_size in range(2,40):
# # print('key_size',key_size)
# a = hamming_distance(cipher[0: key_size], cipher[key_size:2 * key_size]) / key_size
# b = hamming_distance(cipher[2 * key_size: 3 * key_size], cipher[3 * key_size: 4 * key_size]) / key_size
# c = hamming_distance(cipher[4 * key_size: 5 * key_size], cipher[5 * key_size: 6 * key_size]) / key_size
# d = hamming_distance(cipher[6 * key_size: 7 * key_size], cipher[7 * key_size: 8 * key_size]) / key_size
# data = [a, b, c, d]
# variances.append(statistics.variance(data))
# print(variances.index(min(variances)))
for keysz in range(2, 40):
print(keysz, hamming_distance(cipher[:keysz], cipher[keysz: 2 * keysz]) * 1.0 / keysz, sum([hamming_distance(cipher[keysz * i:keysz * i + keysz], cipher[: keysz]) for i in range(10)]) * 1.0 / keysz)
# key_size = 4
# for key_size in range(1,40):
# print(len(cipher) / key_size)
# for i in range(int(len(cipher) / key_size)):
# for key in range(255):
# decrypted = "".join(chr(b ^ key) for b in cipher[i * key_size: i * key_size + key_size])
# print(decrypted)

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set1/chellenge7.py Normal file
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set1/encrypted7.bin Normal file
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