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For a 24-bit IV, the chance that the same IV would repeat after 5000 packets is ___
75%
25%
50%
100%
The purpose of an IV, which is transmitted as plain text, is to prevent any repetition, but a 24-bit IV is not long enough to ensure this on a busy network. The way the IV was used also opened WEP to a related key attack. For a 24-bit IV, there is a 50% probability the same IV will repeat after 5000 packets. https://en.wikipedia.org/wiki/WiredEquivalentPrivacy#Security_detailsEDIT If we went far enough wouldn't there be a 100% chance the IV would be seen again? This question needs to be reworded to be accurate.
See that reference:https://www.quora.com/What-is-the-concept-behind-WEP-wifi-hacking-Can-someone-explain-the-technical-drawback-in-WEP-security. It explains why the probability is 50%, although there are 2^24 (16777216) possible combintaions possible. Short answer: birthday attack
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