a. In public key authentication, what must the sender know that an impostor should not be able to learn? b. For what type of authentication is a digital signature used—initial authentication or...

a. In public key authentication, what must the sender know that an impostor should not be able to learn? b. For what type of authentication is a digital signature used—initial authentication or messageby-message authentication? c. How does the supplicant create a message digest? d. How does the supplicant create a digital signature? e. In public key encryption, what is “signing”? f. What combined message does the supplicant send? g. How is the combined message encrypted for confidentiality? h. How does the verifier check the digital signature? i. Does the verifier use the sender’s public key or the true party’s public key to test the digital signature?