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WEP - I don not really understand

Forum Wireless Networking : Setup, Configuration & Security - WEP - I don not really understand

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Hey,
my question about WEP:

Packets are encrypted with an RC4 cipher stream generated by a 64 bit RC4 key. And this key is composed of a 24 bit IV and a 40 bit shared key.
Why packets should be encrypted with this cipher stream instead of IV + sharedkey? What is difference? :?

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Tom's Hardware > Forum > Wireless Networking > Setup, Configuration & Security > WEP - I don not really understand
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