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Public key infrastructure (PKI) consists of programs, data formats, procedures, communication protocols, security policies, and public key cryptographic mechanisms working in a comprehensive manner to enable a wide range of dispersed people to communicate in a secure and predictable fashion. This infrastructure is based upon which of the following Standard?
Correct Answer: A
Explanation/Reference: Explanation: Public key infrastructure (PKI) is an ISO authentication framework that makes use of public key cryptography and the X.509 standard. Incorrect Answers: B: X.500 is a series of computer networking standards that cover electronic directory services. It is not, however, used by PKI. C: X.400 is a group of ITU-T Recommendations that define standards for Data Communication Networks for email. D: X.25 is an ITU-T standard protocol suite for packet switched wide area network (WAN) communication. References: Harris, Shon, All In One CISSP Exam Guide, 6th Edition, McGraw-Hill, 2013, pp. 833 https://en.wikipedia.org/wiki/X.500 https://en.wikipedia.org/wiki/X.400 https://en.wikipedia.org/wiki/X.25