Question: Cryptography By using Affine Cipher decrypt the following message KYGREZ with the Pair Key ( 9 , 4 ) . Encrypt the message this is

Cryptography
By using Affine Cipher decrypt the following
message "KYGREZ" with the Pair Key (9,4).
Encrypt the message "this is an exercise" using the following
ciphers.
Additive Cipher with key (20).
Multiplicative Cipher with key (15).
Affine Cipher with key (19,20).
Cryptography By using Affine Cipher decrypt the

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