Computer security

1. Suppose that the letters J, U, S and T were assigned the numbers 2, 3, 4 and 5 respectively. Use the RSA described in the class to do the following: a. Choose p 3 andq 11, encode the phrase "JUST b. Apply the decryption algorithm to the encrypted version to recover the original plain text message. Show the steps Based on the following assigned table answer questions 2 and question 3 0 12 3 4 5 6 7 8 9 10112 13 14 15 16 17 18 19 20 21 22 23 24 25 2. Use the shift cipher described in the class to encrypt text "We are Trojans". The key (k) 3. Use the shift cipher described in the class to decrypt ciphertext "rpsxwhu". The key is 5. Show the steps size is 3. Show the steps 4. Implement the shift cipher algorithm introduced in the class using MATLAB. Submit the source codes program, test cases, and the results of test runs. Upload the m-file in Blackboard in the same attempt