1) Suppose that A is a member of an RSA public-key system and that his choices for r and s are r = 53 * 71 = 3763 and s = 11. If B wants to send the message NOW to A, what is actually transmitted to A?

2) Suppose that A is as in excercise 1 and A received from B the ciphertext message 0737 1627.

a) Compute A's deciphering key.

b) Decipher B's message to A.

6) Suppose that B is a member of the same RSA public key system as inidivual A in Excercise 1. Let B's public keys be r_B = 47 * 73 = 3431 and s_B = 7. It is not difficult to compute t_B = 2839. Suppose that B wants to send A the signed message I YIELD.

a) What does B actually transmit to A?

b) Describe the steps that A will take in deciphering B's message.