1. Dr. Who decides to use public-key cryptography in his security class to report the midterm grades. Each student is asked to use 2048-bit RSA and post the public key (e, n) publicly on Canvas. Assume that Dr. Who correctly receives the public key of each student. He encrypts each student's score and posts the encrypted score on the website alongside the student's name. The full points of the midterm is 100, and each student only gets an integer score (i.e. no fractional points) A. (5 points): Assume that one student's e is equal to 3. Is this setup secure? If so, briefly argue why. If not, how can an attacker obtain this student's score? B. (5 points): Assume that another student's e is equal to 65537. Is this setup secure? If so, briefly argue why. If not, how can an attacker obtain this student's score?