CompTIA Security Plus Mock Test Q1107

Public keys are used for which of the following?

A. Decrypting wireless messages
B. Decrypting the hash of an electronic signature
C. Bulk encryption of IP based email traffic
D. Encrypting web browser traffic

Correct Answer: B
Section: Cryptography

The sender uses the private key to create a digital signature. The message is, in effect, signed with the private key. The sender then sends the message to the receiver. The receiver
uses the public key attached to the message to validate the digital signature. If the values match, the receiver knows the message is authentic.

Incorrect Answers:
A: Wireless traffic is not decrypted by public keys.
C: Public keys are not used to encrypt email traffic.
D: Public keys are not used to encrypt web browser traffic.

Dulaney, Emmett and Chuck Eastton, CompTIA Security+ Study Guide, 6th Edition, Sybex, Indianapolis, 2014, pp. 279-285