Date: Mon, 15 May 2000 10:45:13 -0700 From: Randy Bush <randy@psg.com> To: Jos Visser <josv@osp.nl> Cc: freebsd-hardware@freebsd.org Subject: Re: Wavelan 802.11 with encryption Message-ID: <E12rOvZ-00009V-00@roam.psg.com> References: <391EF3DE.FA17A058@osp.nl> <E12r5Xj-0001Ux-00@roam.psg.com> <391F1A28.41BC7F50@osp.nl>
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> WEP encryption (default with the Silver Wavelan card) supports a 64-bit > key. actually wep encryption in 802.11 is pretty flawed to begin with. most cards only implement a 40 bit key and given the nature of key management, it will not be changed often. but the real killer is that a 24 bit iv is used to create the per-packet key (in combination with the "permanent" 40 bit key). after 2^24 packets are sent on the network, the rc4 keys will start to be reused. given that rc4 is a pad + xor cipher, this is quite scary. so, while it may be good enough for you, and i am really impressed that you were able to calculate 2^64, it is not good enough for me. and, again, i suggest that it is not good for more than casual use. randy To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hardware" in the body of the message
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