a serial number wouldn't be that hard to hack though. It might take a while but it would definitely be doable. My parallel idea a while back was simply to take one of those old 16 MB keys or whatever that cost less than a buck now and create a 16 MB long password file - virtually impossible to brute force. You put the USB key in, the reader compares the files, boom it lets you in. Easy enough to change passwords (aka switch the locks out) and easy enough to give someone a duplicate key (just copy the file to their personal drive).
If you could somehow work TrueCrypt into that scenario, it might be workable. Would you really want the key to your house to be a) the most easiest thing in the world to copy and b) also mass-distributable? Sure, you could just change "the lock" but still...
...Ok, ideastorm here. Howsabout you have a web server that auto-generates keys, and syncs your phone and lock with a new key every X hours (and would, say, require another password as well). Now, an attacker needs not only your cell phone, but also the password (in your head) to get into the house...hmmm.
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a serial number wouldn't be that hard to hack though. It might take a while but it would definitely be doable. My parallel idea a while back was simply to take one of those old 16 MB keys or whatever that cost less than a buck now and create a 16 MB long password file - virtually impossible to brute force. You put the USB key in, the reader compares the files, boom it lets you in. Easy enough to change passwords (aka switch the locks out) and easy enough to give someone a duplicate key (just copy the file to their personal drive).
If you could somehow work TrueCrypt into that scenario, it might be workable. Would you really want the key to your house to be a) the most easiest thing in the world to copy and b) also mass-distributable? Sure, you could just change "the lock" but still...
...Ok, ideastorm here. Howsabout you have a web server that auto-generates keys, and syncs your phone and lock with a new key every X hours (and would, say, require another password as well). Now, an attacker needs not only your cell phone, but also the password (in your head) to get into the house...hmmm.