— The combination of hill cipher and affine cipher. The key forthe cipher is a 2-by-2 matrix A and a 2-dimensional vector (b 1 ,b2 ). Just like
in the Hill cipher, the numerical plaintext is split into blocks oflength 2; and each block
(x 1 ,x 2 ) is encrypted using the function
(x 1 ,x 2 ) 7→ [(x 1 ,x 2 )A + (b 1 ,b 2 )] (mod 26).
A guy was able to intercept a snippet of plaintext (kjivne) andthe corresponding ciphertext
(SAGKLM). Your goal is to design a known plaintext attack on thiscipher
and recover the encryption key.
— solve 2
OR
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