I'm registered with XOHM and Clear as a developer, but only so that I can get downloads and participate on their forums. Is anyone on talk.maemo.org familiar with the XOHM, Clear, or Sprint profile managers? As far as I can tell, they must be doing a combination of MAC-based ACLs plus public/private keys via profile manager. http://en.wikipedia.org/wiki/WiMAX is an incredibly thorough Wikipedia entry, but either they don't mention WiMAX security or I don't speak CIS well enough to understand: http://en.wikipedia.org/wiki/WiMAX#I..._based_Network Surely it isn't MAC alone?