ciphergoth comments on Bullying the Integers - Less Wrong Discussion
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What then-known weaknesses in RC4 do you have in mind?
I don't get your meaning about key sizes, could you be more specific?
WEP does not re-use IVs.
WEP uses 24-bit IVs. Birthday paradox guarantees IV reuse.
Original WEP uses 40-bit key. This is already borderline broken, so any extra weakness moves us into trivially broken in seconds territory WEP occupies now.
RC4 weak key schedule.