> 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/
There are, as near as I can tell, only three options: either (a) you trust the sender's clock, (b) you trust the recipient's clock, or (c) you trust a third-party clock. Once you know which clock the system is trusting, attack the clock. Subvert and/or impersonate it, rewind time back, and view the message again. Every time-based security scheme I've found has had this failure mode. It seems to be impossible to avoid. _______________________________________________ Gnupg-users mailing list Gnupg-users@gnupg.org http://lists.gnupg.org/mailman/listinfo/gnupg-users