What is a public key infrastructure? select one: a. a structure that enables parties to use communications such as email b. a structure that provides all of the components needed for entities to communicate securely and in a predictable manner c. a structure that enables secure communications in chat rooms, instant messaging, and text messaging d. is a method of securing communications through the use of a single shared key

B. A public key infrastructure (PKI) allows users of the Internet and other public networks to engage in secure communication, data exchange and money exchange. This is done through public and private cryptographic key pairs provided by a certificate authority.

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