Question

____________ uses the stream cipher RC4 (128 bit or 256 bit). For a 24-bit IV, there is a 50% probability the same IV will repeat after 5000 packets. A) WEP (Wired Equivalent Privacy)

B) WPA (Wi-Fi Protected Access)

C) WPA2 (Wi-Fi Protected Access 2)

D) TKIP (Temporal Key Integrity Protocol)

Answer 1

The stream cipher RC4 with a 24-bit IV that has a 50% chance of IV repetition after 5000 packets is associated with WEP (Wired Equivalent Privacy), which is known for its vulnerabilities and has since been superseded by more secure protocols like WPA and WPA2.

Step-by-step explanation:

The technology that uses the stream cipher RC4, and where a 24-bit IV could lead to a 50% probability the same IV would repeat after 5000 packets, is WEP (Wired Equivalent Privacy).

WEP was found to be vulnerable due to its use of a static encryption key and the relatively small space of possible IVs, which make it susceptible to repeated IV collisions after a certain number of packets. This vulnerability led to the introduction of more secure systems such as WPA (Wi-Fi Protected Access) and WPA2 (Wi-Fi Protected Access 2), both of which employ more robust security measures and larger IV spaces to avoid such repetitions. TKIP (Temporal Key Integrity Protocol) was introduced with WPA as an interim solution to improve upon WEP without requiring new hardware.