Siemens IEEE802.11 - Manual (Page 60)

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 60 © Siemens, 2002
Shortcomings of plain WEP security
n
WEP unsecure at any key length
– IV space too small, lack of IV replay protection
– known plaintext attacks
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No user authentication
– Only NICs are authenticated
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No mutual authentication
– Only station is authenticated against access point
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Missing key management protocol
– No standardized way to change keys on the fly
– Difficult to manage per-user keys for larger groups
n
WEP is no mean to provide security for WLAN access,
– … but might be sufficient for casual uses.