[LINK] spy technology

[Geoffrey Ramadan]

Eric Scheid wrote:
> On 21/5/07 1:31 PM, "Geoffrey Ramadan" <gramadan at umd.com.au> wrote:
>
>   
>> By the way, most of you probably don't realise that you are already
>> carrying a RFID tag... in most modern cars with Imobilizers... the key
>> has an embedded Low Frequency (short range) RFID tag which is red by the
>> ignition system. (in interesting outcome of this is that you could use
>> you Car Key as access to say you home or office).
>>     
>
> Is this really an RFID, which to my understanding presents a static ID?
>
> I thought the key-thing provided an ID from a rolling sequence, and this is
> done to prevent eavesdroppers driving off with your car. Maybe a stepped
> sequence, or maybe a timed sequence (like those magic number encryption
> dongles people log in with).
>   
The key ring uses standard LF Tags like:
http://www.umd.com.au/itd/products/ti_rfid_12mmwedge.html

The static ID is uniquely tied to the vehicle Imobiliser system 
(programmed by the Car Dealer). You will see a small metal ring around 
your ignition system. This is in effect the antenna, but is used more 
like a "touch" reader.

Reg
Geoffrey Ramadan