3 ms·
Rights Amplification in Master-Keyed Mechanical Locks (2003) [pdf]
- foodstances 4y agoEvery time I see an F1 race and see all of the crypto.com ads, I can't help but picture Matt Blaze spending millions of dollars to advertise his blog.
- Gordonjcp 4y agoIs this available in a readable form?
- colmmacc 4y agoMatt recently wrote a tweet thread about this paper and his history with a University Locksmith ... https://twitter.com/mattblaze/status/1553244850304290817 https://twitter.com/mattblaze/status/1553244850304290817
- glorioushubris 4y agoI remember reading this when it was published, as I was living in a college dorm at the time and strongly considered using this method to produce a master key. I didn't, because I couldn't think of anything I'd want to do with the master key once I had it. But I enjoyed knowing that I could make one if I'd wanted to.
- spoonjim 4y agoYou don't know that you could make one until you do make one.
- jacquesm 4y agoThat isn't necessarily true. There are a ton of things that I know how to make and that I'm sure that I can make but which I haven't made yet.
- aidenn0 4y agoI had plenty of legitimate uses for a master key, but I didn't make one because once 2 or 3 people know you have a master key you get blamed for every single misplaced object in the whole damn dorm.
- yccs27 4y agoThe difficulty of this attack is definitely in producing so many test keys. I imagine that it might not be much easier than disassembling the lock.
- aidenn0 4y agoYou need one test key per pin, so on the order of 7 keys; that's not so terrible.
- vgel 4y agoDon't you need (up to) `N cut depths - 1` keys per pin? E.g. if there are 4 possible cut depths for a pin, and your key has depth 3 on pin 1, you need to (potentially) test depths 1, 2, and 4 -- and if none of them work, your key shares a depth with the master key.
- vgel 4y agoOh, you could re-use the same test key if you start at the higher depth, of course.