Affine Cipher - please help!!!

Affine Cipher - please help!!!

Posted in the Cryptography Forum

Valeria

Nicosia, Cyprus

#1 Nov 22, 2012
in the case where the arbitary constant p (the one we use for the encrypt function i.e. ek(m) ≡ k1 ⋅m + k2 (mod p) and decrypt function i.e. dk(c) ≡ k1′ ⋅ (c − k2)(mod p)) is not publicly known, is the affine cipher vulnerable to a chosen plaintext attack? If so, how many pairs of plaintext - ciphertext is needed for the attacker to find the key????

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