amason2781 amason2781
  • 05-04-2024
  • Computers and Technology
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Assume that we are using affine cipher and only capital letters for communication (A ~ Z; 26 letters).

Encryption: y = ek(x) ≡ (a∙x + b) mod 26

Decryption: x = dk(y) ≡ a-1(y – b) mod 26 where x is plaintext, y is ciphertext and k, x, y Z26.

What is the key space for the affine cipher? Please show your steps.

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