1. The ciphertext CRWWZ was encrypted using an affine cipher. The plaintext starts with ha. Decrypt the message. 2. Decrypt the following Caesar encryptions by trying the various possible shifts until you obtain readable text. 'NJACQYAXERMNBNWXDPQCXBJCRBOHNENAHVJWBWNNMBKD- CWXCNENAHVJWBPANNM’ 3. (a) Suppose that you have an alphabet of 26 letters how many possible simple substitution ciphers are there? (b) Determine the number of keys in an Affine Cipher in an alphabet system with i. 32 alphabets ii. 100 alphabets
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1. The ciphertext CRWWZ was encrypted using an affine cipher. The plaintext starts with ha. Decrypt the message. 2. Decrypt the following Caesar encryptions by trying the various possible shifts until you obtain readable text. 'NJACQYAXERMNBNWXDPQCXBJCRBOHNENAHVJWBWNNMBKD- CWXCNENAHVJWBPANNM’ 3. (a) Suppose that you have an alphabet of 26 letters how many possible simple substitution ciphers are there? (b) Determine the number of keys in an Affine Cipher in an alphabet system with i. 32 alphabets ii. 100 alphabets
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