[LINK] E-Tag security?
paul.mcgowan at yawarra.com.au
Fri Dec 15 14:43:30 AEDT 2006
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
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
Can anyone point me to information on the actual protocol(s)?
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