From what I've heard (not confirmed) most of this stuff is either simple sensors (continuity test) or it talks over a variant of rs422 - unencrypted for things like keypads. Not good, especially if these are accessible on the outside.
----------------------Kaos-Keraunos-Kybernetos--------------------------- + ^ + :25Kliters anthrax, 38K liters botulinum toxin, 500 tons of /|\ \|/ :sarin, mustard and VX gas, mobile bio-weapons labs, nukular /\|/\ <--*-->:weapons.. Reasons for war on Iraq - GWB 2003-01-28 speech. \/|\/ /|\ :Found to date: 0. Cost of war: $800,000,000,000 USD. \|/ + v + : The look on Sadam's face - priceless! --------_sunder_@_sunder_._net_------- http://www.sunder.net ------------ On Sat, 9 Aug 2003, Neil Johnson wrote:
I have always wondered how the arm/disarm keypad works in most alarm systems.
I would hope it would send a reasonably secure code to the controller to disable the alarm system, but I fear that it just a nothing more than a fancy remote relay and can be easily bypassed.