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?
A.
X.509
B.
X.500
C.
X.400
D.
X.25
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.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