Which of the following standards concerns digital certificates?

The correct answer is C. X.509. X.509 is used in digital certificates. X.400 is used in e-mail as a message handling protocol. X.25 is a standard for the network and data link levels of a communication network and X.75 is a standard defining ways of connecting two X.25 networks.

Submitted by chiamaka_o· Apr 18, 2026Cryptography

Question

Options

AX.400
BX.25
CX.509
DX.75

How the community answered

(23 responses)

A
4% (1)
B
4% (1)
C
91% (21)

Explanation

X.509 is used in digital certificates. X.400 is used in e-mail as a message handling protocol. X.25 is a standard for the network and data link levels of a communication network and X.75 is a standard defining ways of connecting two X.25 networks.

Topics

#Digital Certificates#X.509 Standard#PKI#Standards

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