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Public Key Infrastructure (PKI) uses asymmetric key encryption between parties. The originator encrypts information using the intended recipient's "public" key in order to get confidentiality of the data being sent. The recipients use their own "private" key to decrypt the information. The "Infrastructure" of this methodology ensures that:
Correct Answer: B
Explanation/Reference: Explanation: When information is encrypted using a public key, it can only be decrypted by using the associated private key. As the recipient is the only person with the private key, the recipient is the only person who can decrypt the message. This provides a form of authentication in that the recipient's identity can be positively verified by the sender. If the receiver replies to the message, the sender knows that the intended recipient received the message. References: Harris, Shon, All In One CISSP Exam Guide, 6th Edition, McGraw-Hill, 2013, pp. 784-785