Task#$1$

a$)$ Decrypt the message below using substitution cipher. Show all your steps.

A UHC M V K F V B Y Z U C V

I ZM C C J G U M B Z A Z D U K U V M$.$

V C $,HZZGZB,CJ,$ G Z $,V,HCJJ$

PD CFZ VYJM KUCZ AZUBVMK

C J $,$ CF Z $,$ B Y W Z $,$ U M B $,$ O J Y

IFVAZ V T JNAB $,$ M J $,$ Z M C Z Y

O JY CFZ IUD IUH PUYYZB

C J G Z$.$

Show all of your steps.

b$)$ Suppose that the ciphertext DVE CFMV KF NFEUVI,

REU KYRK ZJ KYV JVVU FW JTZVETV was produced by encrypting a plaintext message using

a shift cipher. What is the original plaintext? Show all of your steps.