cryptomedium

Not easy — Affine Cipher

spbctf

Task: Decrypt affine cipher with known flag format. Solution: Use known plaintext attack to recover a=15, b=16, then compute modular inverse for decryption.

$ ls tags/ techniques/
known_plaintextmodular_arithmeticaffine_cipherclassic_cipher
modular_inverseaffine_cipher_cryptanalysis
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