$1.(15$ pts$)$ Consider the shift cipher. Show that the ciphertext $$NKWZ$$ can be

decrypted into two meaningful English words. Find those words and the

corresponding encryption keys.

$2.(20$ pts$)$ Consider the ciphertext generated by Affine Cipher over Z$26.$ As a hint, you

are told that the most frequent letter in the plaintext is $$T$.$ Find the plaintext, the

encryption and decryption keys. Show your work.

"Tpdzob jwi dont; uyzb dulfaoz uyju mlw qjdu."