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Re: Security system
From: Tom Grace <tom () deathbycomputers co uk>
Date: Tue, 30 Mar 2010 18:36:07 +0100

If you were gonna go with a cell backup, you might find a 3G stick 
easier. You can send SMS with these, or just access the net. The Huawai 
ones work really well with recent Linux, not as sure about the others.

Tom

T Biehn wrote:
Nah, I'm saying a GSM jammer would block your prepaid cell signal.

So if your adversary were to cut the power, cut the net AND jam GSM
you'd be out of luck in getting notification.

You can get all fancy and have your program try all methods available.
Cell, Wired Net, WIFI (throw an antennae on your roof,) pager, etc.

-Travis

On Tue, Mar 30, 2010 at 10:39 AM,  <james () smithwaysecurity com> wrote:
Good idea u saying also I should by a gsm jammer this a good idea I will
try.

Sent from my iPhone

On Mar 30, 2010, at 11:30 AM, T Biehn <tbiehn () gmail com> wrote:

Buy a prepaid cell, rig your comp & phone up to a battery backup.
Breakout board on your Serial port, or from a USB-DB9 RS232 adapter.

Have the text messaged banged out on the prepaid, rig wires from the
breakout board to the cell phone, rig wires from your security sensors
into your breakout board. App to listen on com port send a nice high
signal to the pin connecting to your send key.

Done.

Like, 50$ for the phone incld. minutes.
Like less than 20$ for a breakout board.

Also, rig the ringer up to an input on the breakout board and you can
call your phone to clear your FDE keys from RAM and kill your machine
if you think the man is paying a visit once you get a text :)

Some adversaries will cut net, hardline, sometimes power.

Attacks: GSM jammers, which everyone has.

-Travis

On Sat, Mar 27, 2010 at 6:44 PM, Oscar Bacelar <oscarbm () gmail com> 
wrote:
Try arduino + internet.

2010/3/27 <james () smithwaysecurity com>
Any one got any ides how I would program a system to call me from a
voip network to alert me of a home security breach.

Sent from my iPhone

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