Morten Gulbrandsen wrote: > Allen Schultz wrote: > >> Is there a way to force an expiration date when encrypting a message >> for additional security.
[...] > > sure > > http://vanish.cs.washington.edu/ > Although I think systems like this do have utility, I don't think it really solves this problem. In order to enforce an expiration date against a user who knows the data will expire, you must present the data in some uncopyable way. I can think of no practical way to do that (though of course people smarter than I might :) ). If nothing else, there's nothing to stop me from pointing my camera at my monitor and capturing everything displayed there - stripping off any inconvenient meta-data in the process. -Chris
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