It is desirable to revoke a certificate before it expires because –
(a) the user is no longer certified by this CA
(b) the CA’s certificate is assumed to be compromised
(c) the user’s private key is assumed to be compromised
(d) all of the mentioned
This question was posed to me during an internship interview.
I want to ask this question from Overview topic in portion Cryptography Overview, TCP/IP and Communication Networks of Cryptograph & Network Security