CompTIA Security+ Question E-98

A security administrator must implement a wireless encryption system to secure mobile devices’ communication. Some users have mobile devices which only support 56-bit encryption. Which of the following wireless encryption methods should be implemented?

A. RC4
B. AES
C. MD5
D. TKIP

Answer: A

Explanation:
RC4 is popular with wireless and WEP/WPA encryption. It is a streaming cipher that works with key sizes between 40 and 2048 bits, and it is used in SSL and TLS.

CompTIA Security+ Question C-39

All of the following are valid cryptographic hash functions EXCEPT:

A. RIPEMD.
B. RC4.
C. SHA-512.
D. MD4.

Answer: B

Explanation:
RC4 is not a hash function. RC4 is popular with wireless and WEP/WPA encryption.

CompTIA A+ 220-902 Question E-41

Which of the following security methods requires that a user enter a passcode that is changed at regular intervals?

A. WPA encryption
B. Biometrics
C. PSK
D. RSA token

Correct Answer: D