After encrypting all laptop hard drives, an executive officer’s laptop has trouble booting to the operating
system. Now that it is successfully encrypted the helpdesk cannot retrieve the data.
Which of the following can be used to decrypt the information for retrieval?

A.
Recovery agent

B.
Private key

C.
Trust models

D.
Public key

Explanation:
To access the data the hard drive need to be decrypted. To decrypt the hard drive you would need the
proper private key. The key recovery agent can retrieve the required key.
A key recovery agent is an entity that has the ability to recover a key, key components, or plaintext
messages as needed.
Incorrect Answers:
B: The private key is not readily accessible. You would have to
C: A trust Model is collection of rules that informs application on how to decide the legitimacy of a Digital
Certificate. A trust model cannot recover keys.
D: The public key cannot be used to decrypt the hard drive.

Dulaney, Emmett and Chuck Eastton, CompTIA Security+ Study Guide, 6th Edition, Sybex, Indianapolis,
2014, pp. 262, 279-285, 285-289