This question was posed during Simple Nomad's talk... he stated that when the laptop reverts from Infrastructure mode (wep or not) to the adhoc mode w/ link local, WEP is disabled. So, even if you were using WEP on your last network, if you're in an area that is void of wireless networks for you to auto-attach to, you'll be broadcasting your last network SSID in adhoc mode, using the link local addresses, unencrypted.
Further more, brute forcing could be prevented if each knock were expected to come from a spoofed address. An algorithm could be developed that would take the source addresses of each knock, in addition to their source ports, and compute what the source address (and, maybe, source port number) will be for the final "legitimate" connection. This way, even if the connection is sniffed, it would be useless unless the person doing the sniffing were to attempt a connection from the same address (which is possible behind NAT, I suppose)..
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This question was posed during Simple Nomad's talk... he stated that when the laptop reverts from Infrastructure mode (wep or not) to the adhoc mode w/ link local, WEP is disabled. So, even if you were using WEP on your last network, if you're in an area that is void of wireless networks for you to auto-attach to, you'll be broadcasting your last network SSID in adhoc mode, using the link local addresses, unencrypted.
Further more, brute forcing could be prevented if each knock were expected to come from a spoofed address. An algorithm could be developed that would take the source addresses of each knock, in addition to their source ports, and compute what the source address (and, maybe, source port number) will be for the final "legitimate" connection. This way, even if the connection is sniffed, it would be useless unless the person doing the sniffing were to attempt a connection from the same address (which is possible behind NAT, I suppose)..
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