Question

_______ are used as the base of the Public Key Infrastructure.

(a) SSL certificates

(b) TLS certificates

(c) X.509 certificates

(d) HAS certificates

I have been asked this question during an interview.

I'd like to ask this question from Cryptography topic in section Number Theory and Cryptography of Discrete Mathematics

Answer 1

Correct answer is (c) X.509 certificates

Explanation: The X.509 certificates may be used as a base of the Public Key Infrastructure. PKIX is a tree structure where a Certificate Authority can be used to give trust to end entity certificates. X.509 certificates cannot directly use symmetric cryptography.