We run our home/office access point in WPA encrypted mode. This is, AFAIK the only reasonably secure protocol available in the common Linksys WRT* routers.
It works very well on my Gentoo laptop using madwifi (and has worked well for quite a while now). Took a bit of fiddling, probably 4 or 5 hours, but a lot of that was figuring out the basics of how it wpa is supposed to work and how you're supposed to integrate it into Gentoo.
Gentoo's documentation was very helpful here once I got past the "what do you mean I can't just configure it via the UI" thing.
Soni's (new) Lenovo laptop (using ndiswrapper) can be nudged onto the network if we manually run wpa_supplicant or keep re-running /etc/init.d/networking restart. We spent a very long time on this, probably 2-3 hours, and that's with the configuration from my laptop available for reference.
Ubuntu (Kubuntu)'s documentation was comparatively poor for this, though a lot of the problems were just down to my not having built the system (which, of course, I do for the Gentoo boxes) and thus not knowing where each of the configuration files was or how they worked. Obviously we still haven't finished the task, so more documentation needed.
Rose's Gentoo laptop (using ndiswrapper) can't get onto the network at all (it was on at one point, but it doesn't work any more). I've only spent about 10 minutes on trying to figure this one out, Rose doesn't use Linux very often and Soni has her new laptop now. I was just wanting to upgrade the machine using the binary packages from my laptop this evening... but without a network (the hard links are all in the other room) it's difficult.
It seems that, as with WEP, it should be reasonably possible to just have klaptop (or whatever) provide a WPA encryption setup option alongside the WEP one. I get that it's a different piece of software providing the "supplication", and I get that it's rather finicky and distribution-specific (believe me, I get that), but this seems like it should be way up on the list of basic requirements for desktop (laptop) Linux. "Able to connect to WiFi networks as easily and universally as possible."
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