[LINK] E-Tag security?

Geoffrey Ramadan gramadan at umd.com.au
Sat Dec 16 00:05:02 AEDT 2006


I don't know what the protocol is, but the scheme is unlikely to work, 
as City link also takes photographs of all vehicles.


Geoffrey Ramadan B.E.(Elec)
Chairman, Automatic Data Capture Association (www.adca.com.au)
Managing Director, Unique Micro Design (www.umd.com.au)

Paul McGowan wrote:
> Hi Linkers,
> This is mainly idle curiosity, but I was wondering if anyone knew 
> what sort of security safeguards are in place for E-Tags as used on 
> Melbourne and Sydney (and no doubt many other) tollways?
> Specifcally, I was wondering what sort of protections there are in 
> the scanning protocol to ensure that things like replay attacks can't 
> happen. 
> The scenario I am pondering involves producing a scanner that can 
> elicit a reply from a parked car where an E-tag is visible, then 
> replaying this reply to the toll gantry as you pass under it.  If it 
> worked (and I sincerely hope it wouldn't) it would make a very easy 
> way to steal from innocent motorists and use the tollways free, not 
> to mention anonymously.  I would imagine that collecting many 
> different replies and playng a random one would make it even harder 
> to detect.
> Can anyone point me to information on the actual protocol(s)?
> Best regards,
> Paul McGowan
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