cryptomedium
RSA 1000
hackerlab
Task: 1000 RSA public keys (128-bit), flag encrypted with unknown key, known plaintext+ciphertext pair provided. Solution: identify correct key via known plaintext attack on first block, factor small modulus, decrypt flag block-by-block.
$ ls tags/ techniques/
known_plaintext_attackrsa_small_key_factorizationblock_cipher_ecb_mode_decryption
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