A2. Public key cryptosystems In the RSA public key cryptosystem encryption and decryption are performed using a public-key pair (n, e) and private key pair (n, d), where n, dand e are integers. a) Given the following translation table between text symbols and numbers SPACE 00 A 01 B 02 Z 26 use the public-key pair (91, 5) to encode the message text: MRNA VACCINE [6] b) Quantum computers may compromise the security of the RSA cryptosystem. What | feature of RSA, in particular, is threatened by the advent of quantum computers? [4]