17 Dec
2003
17 Dec
'03
11:17 p.m.
Applications include sending an encrypted message via fax: the receiver can carry the key transparency with him and can receive the encrypted fax from an insecure machine. Cool stuff.
Yea, cool stuff, especially if the fax doesen't shrink the transmitted picture :-) Shamir's comment on this at his talk at MIT was that the accuracy of a fax machine in the horizontal direction was much better than the accuracy in the vertical direction. If the visually encrypted document is a text file, you can adjust it so that it's correctly registered for a few lines, read those lines, slide the key transparancy by a small fraction of an inch, read the next few lines, and repeat until you're done with the message. - Bill