In computer security, PKI stands for which of the following?

• A. Private Key Interface.
• B. Public Knowledge Internet.
• C. Personal Key Integrity.
• D. Public Key Infrastructure.

Answer: (D)

Public Key Infrastructure is a framework that enables secure communication by using public-key cryptography and binding public keys to identities through digital certificates issued by trusted authorities. It provides authentication, confidentiality, integrity, and non-repudiation across networks. Key components include certificate authorities, registration authorities, certificate databases, and certificate revocation lists, typically using X.509 certificates. In practice, PKI underpins TLS/SSL for websites, email security, and code signing. The other terms listed don’t represent a recognized security framework for managing keys and certificates.