Re: Cryptographic strength in Wireless Alarm Systems?

<panteltje@xxxxxxxxx> wrote in message
news:1145308295.953337.276670@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
|
| Carlos Moreno schreef:
|
|
| > Anyway, I'm hoping someone here might know a bit about the
| > technical details, how they really work and if they're really
| > secure (reasonably secure, that is -- not like I need to
| > protect my house against the top secret military agencies
| > or against the cream of the cream of the organized crime).
|
| I can say only one thing:

Well, that's about all you know, so go ahead...

| wireless cameras, and other wireless stuff is 100% idiotic NOT secure.
| That is from the POV of electronics and design.

Linear idiocy, that is. Use Ch. 3, you should be able to afford that.

| It is easy for an attacker to find the frequency these things work.
| Then it is easy to bring a transmitter to jam it.

Hhahahahahahaa ROFLMAO - ever hear of spread spectrum??

| It may then well continuously signal alarm or error, or no picture, or
| whatever, locating the interfering transmitter can be more difficult.
| That would take time.

Yeah - just look for the smoking van...

| As the place will not know WHERE it is attacked, it will have to switch
| off all those alarms, and will be without protection until a service
| guy comes.
| (One that can locate the jammer haha).
| The attacker can use that time.
| And, actually the same goes for RFID tags, jam the place with a
| transmitter,
| and no tag will be readable.
| Wiring a good alarm system is difficult and requires some knowledge.
| Lots of pitfalls possible.
|

If the sytem uses spread spectrum (which is very likely) you will have to
spend a LOT of $ to jam every channel it uses. for a SIMPLE spectrum that
could mean 256 transmitters capable of jamming all the links from a greater
radius than whatever physically exists in the security installation.
Keeping this simple as possible, that would mean a van full of 2Ghz+
transmitters each drawing about 10 watts each. You would be sitting inside
a microwave oven, and that's just scratching the very surface of all the
problems you face.

Hehehehehee ignorance is bliss, no? You'll have a LOT of time to think
about it!
Jeez...

- Ed.

.

Relevant Pages

  • Re: what is the best wire for a perimeter alarm
    ... have his alarm start wailing. ... So I enclosed the transmitter in a metal box, ... The receiver had a light which indicated it was receiving a signal from the ... And this was jamming the real signals so the extender ...
    (alt.security.alarms)
  • Re: Car alarm that goes off when in a certain distance
    ... I would like to be able to set up a alarm on a car. ... I used a ITI transmitter and a Mercury ... switch attached to the input terminals. ...
    (alt.security.alarms)
  • Re: The John and Doug Gun Debate Thread.
    ... By the time the alarm company calls and verifies a problem, dispatches the police, the police arrive it could be 15 minutes or longer. ... it has no effect on the transmitter. ... My younger brother is an electrical engineer, he deals mostly with data, voice and electrical transmissions. ... I am sure that there is something that can jam a radio signal effectively, but in my case it just isn't worth it - there is nothing in my house worth that effort to steal - one reason why I leave the doors unlocked. ...
    (rec.scuba)
  • Re: 97 Jetta - 3rd Brake Light dead / Programming alarm transmitter
    ... this transmitter programmed and he said that there was no option with ... the factory installed alarm in the '97 model to have keyless entry. ... I also found in the glove box an unopened bag containing a alarm ... But it says put the key in the on position and then switch the valet ...
    (rec.autos.makers.vw.watercooled)
  • Re: vlf transmitter, part II
    ... spectrum for anyone who wants to email me, ... Using spectrum labs built in vlf receiver and a short antenna wire, ... Each one of these smaller peaks has upper and lower sidebands as well. ... transmitter, but I think binary attachments are forbidden here. ...
    (sci.electronics.design)
Quantcast