Topic: Cryptography and Network Security
Which of the following defines format for Public Key Infrastructure?
- A. X.25
- B. X.509
- C. IEEE 802.11
- D. IEEE 802.3
Answer: B. X.509
Explanation: X.509 is an ITU-T standard that defines the format of public key certificates. These certificates are the foundational elements used in a Public Key Infrastructure (PKI) to securely associate a public key with an identity.