RSA is unusual in that the encryption algorithm can be used as part of the process of generating a digital signature. a) Explain how RSA works for encryption and digital signature verification. b) Identify the special property of RSA which allows it to be used both for encryption and digital signatures. c) There are several reasons why it is good practice to separate RSA digital signature key pairs and RSA encryption key pairs. If Alice is using the same RSA key pair for both digital signatures and encryption, explain how Bob could forge Alices signature on a message of his choice if Alice is foolish enough to help him. d) Describe the PKI Infrastructure