CompTIA Security+ Question K-53

Encryption of data at rest is important for sensitive information because of which of the following?

A. Facilitates tier 2 support, by preventing users from changing the OS
B. Renders the recovery of data harder in the event of user password loss
C. Allows the remote removal of data following eDiscovery requests
D. Prevents data from being accessed following theft of physical equipment

Answer: D

Explanation:
Data encryption allows data that has been stolen to remain out of the eyes of the intruders who took it as long as they do not have the proper passwords.

CompTIA Security+ Question A-26

A company needs to receive data that contains personally identifiable information. The company requires both the transmission and data at rest to be encrypted. Which of the following achieves this goal? (Select TWO).

A. SSH
B. TFTP
C. NTLM
D. TKIP
E. SMTP
F. PGP/GPG

Answer: A,F

Explanation:
We can use SSH to encrypt the transmission and PGP/GPG to encrypt the data at rest (on disk).

A: Secure Shell (SSH) is a cryptographic protocol that can be used to secure network communication. It establishes a secure tunnel over an insecure network.

F: Pretty Good Privacy (PGP) is a data encryption and decryption solution that can be used for signing, encrypting, and decrypting texts, e-mails, files, directories, and whole disk partitions and to increase the security of e-mail communications.

CompTIA Security+ Question A-20

Establishing a method to erase or clear cluster tips is an example of securing which of the following?

A. Data in transit
B. Data at rest
C. Data in use
D. Data in motion

Answer: B

Explanation:
A computer hard disk is divided into small segments called clusters. A file stored on a hard disk usually spans several clusters but rarely fills the last cluster, which is called cluster tip. This cluster tip area may contain file data because the size of the file you are working with may grow or shrink and needs to be securely deleted. Data stored on the hard drive is called data at rest.