Oleg Zabluda's blog
Thursday, March 03, 2005
Side channel attacks: Physical security

[via: Bruce Schneier's Crypto-gram]

Flaw in Winkhaus Blue Chip Lock

The Winkhaus Blue Chip Lock is a very popular, and expensive, 128-bit encrypted door lock. When you insert a key, there is a 128-bit challenge/response exchange between the key and the lock, and when the key is authorized it will pull a small pin down through some sort of solenoid switch. This allows you to turn the lock.

Unfortunately, it has a major security flaw. If you put a strong magnet near the lock, you can also pull this pin down, without authorization -- without damage or any evidence.

A great video and whitepaper on Bumping Locks from CCC Physical Security Workshop. There two more good videos there.

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