Question: Textbook: introduction to mathematical cryptography 2. a) Encrypt the message 'THISISANEXERCISE' using affine cipher key K = (15,20). b) Then decrypt the message to get

Textbook: introduction to mathematical cryptography 2. a) Encrypt the message 'THISISANEXERCISE'

Textbook: introduction to mathematical cryptography

2. a) Encrypt the message 'THISISANEXERCISE' using affine cipher key K = (15,20). b) Then decrypt the message to get the original one. c) Find the total number of possible keys to be utilized in the cryptosystem

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