WEP used RC encryption with a -bit initialization vector (IV). The IV repeated after roughly million packets. By collecting packets with repeated IVs, attackers recovered the encryption key. Tools like Aircrack can crack WEP in under minutes. WEP also lacked integrity protection, allowing packet injection attacks. No amount of key rotation can fix WEP because the protocol itself is broken. Never use WEP on any network you control.
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$ curl repovive.com/roadmaps/network-design/wireless-networking/why-wep-failed
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