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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Advances In Databases And Information Systems Uropean Conference Adbis 2020 Lyon France August 25 27 2020 Proceedings Lncs 12245
Authors: Jerome Darmont ,Boris Novikov ,Robert Wrembel
1st Edition
3030548317, 978-3030548315
