Why don't all networks generate weak frames evenly?

Weak initialization vectors are not evenly distributed over the key space, therefore you just might have bad luck. Regardless, there aren't many weak initialization vectors anyways (Less than 0.01%).

As the WiFi Industry continues to discover security flaws in their systems, updates in transmission protocols are released to thwart would-be hackers. Some newer cards do not generate weak packets anymore, particularly Lucent devices.

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