pwnPromedium

Rusty

spbctf

Task: decrypt a flag encrypted with RC4 stream cipher using a fixed key. Solution: perform a known-plaintext attack by encrypting known text with the binary, XOR-ing with the ciphertext to recover the keystream, then decrypting the original ciphertext.

$ ls tags/ techniques/
known_plaintextxorrc4stream_cipherkeystream
known_plaintext_attackxor_keystream_recoverystream_cipher_exploitation
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