Which of the following types of trust models is used by a PKI?
A. Transitive B. Open source C. Decentralized D. Centralized
Answer: D
Explanation: PKI uses a centralized trust model. In a simple PKI a single centralized certification authority (CA). In a hierarchical trust model the root CA is the center of the model, with subordinate CAs lower in the hierarchy. Note: A public key infrastructure (PKI) is a set of hardware, software, people, policies, and
procedures needed to create, manage, distribute, use, store, and revoke digital certificates. A trust Model is collection of rules that informs application on how to decide the legitimacy of a Digital Certificate.