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how do modern car alarms work?

Discussion in 'Security Alarms' started by Reid Fleming, Sep 24, 2008.

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  1. Reid Fleming

    Reid Fleming Guest

    I'm interested in finding out how modern car alarms (eg. Compustar
    1000A) from a security point of view. Is there a technician or
    technical manual out there that could tell me the details? I can't
    seem to find a good writeup anywhere. Are there different protocols?
    Are they proprietary or open source? How does the remote communicate
    securely with the alarm system? Does it send a one-time code, or cycle
    through a number of shared keys? How does the alarm system deal with
    replay attacks? What are the cryptographic methods and the key lengths?
    What attacks are feasible now due to the increase in computer power that
    simply weren't a few years ago? Do the Europeans use different methods
    than North Americans? Etc.

    Thanks a lot,
    Reid
     
  2. G. Morgan

    G. Morgan Guest


    What difference does it make? In the end, all car alarms do is make annoying
    noise that no one pays any attention to. A car thief does not care what
    encryption is being used, he decrypts the locks with a crowbar or a brick.
     
  3. Matt Ion

    Matt Ion Guest

    If you google "how car alarms work" the first hit will lead you here:
    http://auto.howstuffworks.com/car-alarm.htm
     
  4. enigma

    enigma Guest

    As an aside, Bass' head can be decrypted in the same manner.
     
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