GPEN · Question #117
Which of the following are the countermeasures against WEP cracking? Each correct answer represents a part of the solution. Choose all that apply.
The correct answer is B. Changing keys often. C. Using the longest key supported by hardware. D. Using a non-obvious key.. WEP cracking is mitigated by using longer keys, rotating keys frequently, and choosing non-obvious keys. SSID length is unrelated to WEP key security.
Question
Which of the following are the countermeasures against WEP cracking? Each correct answer represents a part of the solution. Choose all that apply.
Options
- AUsing a 16 bit SSID.
- BChanging keys often.
- CUsing the longest key supported by hardware.
- DUsing a non-obvious key.
How the community answered
(31 responses)- A29% (9)
- B71% (22)
Why each option
WEP cracking is mitigated by using longer keys, rotating keys frequently, and choosing non-obvious keys. SSID length is unrelated to WEP key security.
The SSID is a network name identifier and has no relationship to WEP encryption key strength or resistance to IV-based cracking attacks.
Changing WEP keys often limits the number of IV (Initialization Vector) packets an attacker can collect before the key changes, making statistical cracking attacks like FMS harder to complete.
Using the longest supported key (e.g., 128-bit vs. 40-bit) significantly increases the keyspace, requiring an attacker to capture far more IV packets to crack the key.
Non-obvious keys reduce susceptibility to dictionary-based attacks and guessing, adding a layer of complexity beyond purely statistical cracking.
Concept tested: WEP encryption weaknesses and countermeasures
Source: https://www.wi-fi.org/knowledge-center/faq/what-are-wpa-wpa2-and-wep
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