[pchelpers] News:Crypto boffins break car cypher

Gone in 24 hoursBy John LeydenPublished Friday 24th August 2007 18:07 GMT
Cryptographic researchers have identified a practical attack against
the KeeLoq car anti-theft cypher. KeeLoq serves as the cryptographic
underpinning of several car anti-theft mechanisms distributed by
Microchip Technology.


The technology is used in a wide variety of car remote controls from
manufacturers including Chrysler, Daewoo, Fiat, General Motors, Honda,
Jaguar, Toyota, Volvo, and Volkswagen.




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Each device has a unique key that has up to 18 billion billion
combinations, though in practice a much lower key space is used.
Nonetheless, the hardware-dedicated block cypher used in KeeLoq was
thought to be secure.


But a team of security researchers from Belgium and Israel has
developed a technique to identify the key in less than a day. The
technique requires close proximity to an intended mark's key for about
an hour, during which time the key is "probed". Data from this
operation is then analysed for clues that allow the researchers to
identify the unique key associated with a device.



More here:
http://www.theregister.co.uk/2007/08/24/car_cypher_crack/
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