Encrypt the message .STOP POLLUTION by translating the letters into numbers, applying the given encryption function, and then translating the numbers back into letters.a) f(p) = (p + 4) mod 26________________b) f(p) = (p + 21) mod 26________________c) f(p) = (17p + 22) mod 26

Leslie Ogu CSCI 4531 09/06/2016 Chapter 2: Encryption Symmetric Encryption + The universal technique for providing confidentiality for transmitted or stored data + Also referred to as conventional encryption or singlekey encryption + Two requirements to use: + Need a strong encryption algorithm + Sender and receiver must have obtained copies of the secret key in a secure fashion and and must keep the key secure + Only alternative before publickey encryption in 1970’s + Still most widely used alternative + 5 Ingredients + Plaintext + Encryption algorithm + Secret key + Ciphertext