[情報] 汽車鑰匙的加密也破解了
Cryptologists crack the car key code
Posted on : 2005-01-30| Author : Philip Green
Cryptologists at Johns Hopkins University have found a way to crack the
code stored in millions of car keys. The car security system sold by Texas
Instruments involves a transponder chip embedded in the key and a reader
inside the car. The transponder emits radio signals, which the receiver in
the car has to identify. If there is a mismatch then the car will not start
irrespective of whether the key is correct or not.
The research team led by Avi Rubin, a professor of computer science at
Johns Hopkins, cracked the code transmitted via radio signals on security
system using cheap and easily available hardware in flat 15 minutes.
The team was also able to trick the gas station scanners that use a similar
code emitted by a transmitter in the key chain of the car’s key. They used
16 commercial microchips that come for less than $200 each and used them to
find the key for a petrol-purchase tag.
With this code they were able to buy gas from the gas station with the
money being charged on someone else’s (one of the researcher’s) credit
card.
Company spokesman Bill Allen said that the technology has been in use for
seven years now and till now Texas Instruments has never had a reported
incident where a car has been stolen or a gasoline-purchasing tag has been
duplicated.
Sabetti, the business representative of Texas Instruments said, "I think
the way in which it's presented as being inexpensive to do and quick and
all the rest of that is an exaggeration. And because of that, we believe
the technology still is extremely secure for the applications that it's
used in."
Rubin however disagrees with the company statement as he says, "I think the
implications are that it sets us back about 10 years ago where we were with
car security." He has recommended distributing free metallic sheaths to
conceal the radio frequency from the devices when they are not being used.
Rubin further added that, "millions of tags that are currently in use by
consumers have an encryption function that can be cracked without requiring
direct contact. An attacker who cracks the secret key in an RFID tag can
then bypass security measures and fool tag readers in cars or at gas
stations."
Bedford, Mass.-based RSA Security Inc, funded the Johns Hopkins team.
http://www.earthtimes.org/articles/show/1434.html
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