WPA/WEP key discovery time

Good morning. I'm looking for some hints about where to start looking to
determine how often to cycle the keys used in a WEP and WPA installation.

128 bit WEP typical transfer 5m bytes/day.
WPA (personal, static key) typical transfer 500m bytes/day.

Both are part of a layered system - no unencrypted traffic goes over the
link, and all the hosts only listen to SSH traffic - the priority is
stopping access to network resources and limiting the time avaialable to
abuse the machines on the network. The WEP network can't be dropped because
the device it handles has no other hardware support, but internal routing
limits it's access to the rest of the network.

A typical attacker would have access to a fast current generation machine,
there are a lot of students around here with far too much time on their
hands.
Received on Mon May 1 01:53:45 2006