cryptoPromedium

Нулевой шифр (Null Cipher)

hackerlab

Task: Decrypt an intercepted HTTP request containing a Base64-encoded RC4 ciphertext. Solution: Exploited known flag format (CODEBY{...}) to recover the encryption key, since the key was derived from the first 6 characters of the flag.

$ ls tags/ techniques/
sha256source_code_analysisbase64rc4stream_cipherflag_format_attackarc4known_prefixkey_derivationhttp_request
Base64 decodingKnown prefix attack on key derivationRC4 decryption with recovered keySource code analysis for vulnerability identification
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