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Imagine if you could use a small, inexpensive device to unlock almost any car or garage door. Well, that’s not a robber’s dream, that device actually exists.
It’s called RollJam, and it’s essentially a $30 “universal key” for cars and garage doors that use the same vulnerable wireless unlocking technology, according to its creator, the hacker and security researcher Samy Kamkar.
Car and garage door keys commonly use constantly changing codes to unlock doors. These are called “rolling codes,” unique combinations that change every time you press the lock or unlock button on your wireless key, and expire as soon as they are used (every new code also invalidates the previous ones) …. http://motherboard.vice.com