Question: Cryptography & Network Security Public Key Infrastructure (PKI). (a) Explain the purpose of certificates, certificate authorities (CAs), and private- public key pairs in a PKI.

Cryptography & Network Security
Public Key Infrastructure (PKI).
(a) Explain the purpose of certificates, certificate authorities (CAs), and private- public key pairs in a PKI.
(b) What are the differences between the X.509 PKIX and the PGP trust models? In which case is one better than the other?
(c) Figure 1 illustrates a CA hierarchy consisting of 6 certificate authorities. A certificate Cert for Bob was generated and signed by CA 3.
Cryptography & Network Security Public Key Infrastructure (PKI). (a) Explain the
(i) If Alice receives Cert, what should she do to check that Cert is authentic?
(ii) Will Cert still be trusted if CA 2s certificate was revoked? Explain why or why
not.

CA 1 CA 2 CA 5 CA4 CA 6 Cert Figure 1: Problem 1(c)

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