GCFA Question #232: Real Exam Question with Answer & Explanation

The correct answer is A. Dynamic WEP B. TKIP C. Static WEP. RC4 is the underlying stream cipher for WEP (both static and dynamic) and TKIP, while CCMP uses AES and has no dependency on RC4.

Question

Which of the following encryption methods use the RC4 technology? Each correct answer represents a complete solution. Choose all that apply.

Options

ADynamic WEP
BTKIP
CStatic WEP
DCCMP

Explanation

RC4 is the underlying stream cipher for WEP (both static and dynamic) and TKIP, while CCMP uses AES and has no dependency on RC4.

Common mistakes.

D. CCMP uses AES in Counter Mode with CBC-MAC for both encryption and integrity, replacing RC4 entirely and forming the basis of WPA2 security - it shares no dependency on the RC4 cipher.

Concept tested. RC4 stream cipher use in WEP and TKIP protocols

Reference. https://www.cisco.com/c/en/us/support/docs/wireless-mobility/wireless-lan-wlan/67134-cisco-aironet-wep.html

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