Matt BlazeMar 27

Physical security and cryptography can learn from each other, part 11367:

Hotels wisely don't put the room number on guest keycards so if someone finds your card, they'd have to exhaustively search the hotel to find the room it opens.

Some hotels now have elevators programmed to only let you call the floor for which your keycard is coded, preventing guests from wandering to other floors.

But it also means the elevator can be used as an efficient oracle to determine the floor of a found key.

Show threadKevin Karhan Mar 27
@mattblaze same applies to i.e. self-storage units.
Show threadNorman WilsonMar 27
@kkarhan @mattblaze Isn't a hotel room a self-storage unit?
Show threadKevin Karhan Mar 27
@oclsc @mattblaze last time I checked a self-storage unit doesn't allow sleeping in.
Show threadMatt BlazeMar 27
@kkarhan @oclsc Right. That's for meth labs only.
Show threadKevin Karhan Mar 27
@mattblaze @oclsc most don't even have power...
Show threadNorman Wilson
@kkarhan @mattblaze Why would I store myself in a place without power? How else could I charge my phone?
Mar 27 at 8:48pmWeb