def xor_decrypt(ciphertext): # 使用列表推导式优化解密过程 decrypted_bytes = bytearray(ciphertext, 'utf-8') decrypted_bytes = bytearray([byte ^ idx for idx, byte in enumerate(decrypted_bytes)]) return decrypted_bytes.decode('utf-8') def caesardecrypt(ciphertext, key): key_bytes = bytearray(key, 'utf-8') plaintext_chars = [] for idx, char in enumerate(ciphertext): if char in "_{}": # 保留特殊字符 plaintext_chars.append(char) else: char_code


= ord(char) key_idx = idx % len(key_bytes) key_code = key_bytes[key_idx] plain_code = (char_code - key_code) % 256 plain_char = chr(plain_code) plaintext_chars.append(plain_char) plaintext = ''.join(plaintext_chars) return plaintext def decrypt_flag(ciphertext, key): decrypted = xor_decrypt(ciphertext) plaintext = caesardecrypt(decrypted, key) return plaintext [2024-09-26 23:42:47 | AI写代码神器 | 309点数解答]
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