Question: The ciphertext BWDDC was encrypted using an affine cipher of the form fa,b(x) = (ax+b) (mod 26).It is known that the plaintext starts HA. (a)

The ciphertext BWDDC was encrypted using an affine cipher of the form fa,b(x) = (ax+b) (mod 26).It is known that the plaintext starts HA.

(a) Since we know two letters of the plaintext we can compute two values of the function fa,b.What are they?

(b) Use your answer to (a) to compute a and b.

(c) Decrypt the message

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