XOR Asoslari — Single Byte XOR Yechim

Masala tahlili

Har bayt 0x42 kalit bilan XOR qilingan.

Berilgan (hex): 1c 37 36 36 71 78 72 6e 70 72 37 6e 71 16 70 72

Fikrlash jarayoni

XOR xususiyati: (A XOR K) XOR K = A

Demak: ciphertext XOR 0x42 = plaintext

Bosqichma-bosqich yechim

1-qadam: Hex ni baytlarga aylantirish

hex_data = "1c 37 36 36 71 78 72 6e 70 72 37 6e 71 16 70 72"
data = bytes.fromhex(hex_data.replace(' ', ''))

2-qadam: 0x42 bilan XOR

key = 0x42
plaintext = bytes([b ^ key for b in data])
print(plaintext.decode())

3-qadam: Natija

NULL{xor_1s_basic}

Python script

#!/usr/bin/env python3

ct_hex = "1c 37 36 36 71 78 72 6e 70 72 37 6e 71 16 70 72"
ct = bytes.fromhex(ct_hex.replace(' ', ''))

key = 0x42
pt = bytes([b ^ key for b in ct])
print(f"Flag: {pt.decode()}")

Yakuniy flag

NULL{xor_1s_basic}

O'rganilganlar

• XOR operatsiyasining o'z-o'zini bekor qilish xususiyati
• bytes.fromhex() ishlatish
• List comprehension bilan baytlarni qayta ishlash