Due date: Friday, September 22d by 11:59 PM are not accepted. 1) The earliest known, and the simplest, use of a substitution cipher was by Julius Caesar. The Caesar cipher involves replacing each letter of the alphabet with the letter standing three places further down the alphabet (letter a' is mapped to letter d'). a) Partial credit 1: Given the below plaintext, what is its ciphertext based on Ceasar cipher?[l point] plain: meet me after the Irma party b) Partial credit 2: Ifit is known that a given ciphertext is following Caesar cipher but with different shift what is the easiest cryptanalysis solution to decrypt the message? (Explain this technique in 2-3 sentences Hint: It relates to brute forcing technique.)[I point] 2) Given the below ciphertext which has been encrypted using substitution cipher, answer the following questions UzQSoVUOHXMOPVGPOZPEVSGZWSZOPFPESXUDBMETSXAIZ VUEPHZHMDZSHZOWSFPAPPDTSVPQUZWYMXUZUHSX EPYEPOPDZSZUFPOMBZWPFUPZHMDJUDTMOHMO a) Partial credit 1: Determine the frequency of repeating the following letters in the above ciphertext. point] P, Z, S, W Hint: The frequency ofthe lettersF, and C" in the ciphertext (in percentages) are as follows: F:3.33, C:0.00 b) Partial credit 2: Supposed that the below figure shows the relative frequency of letters in English text. Comparing the breakdown that you findout in the partial credit I with the below figure, find the equivalents of plain letters for the below letters. [1 point] P, Z, S, W