a24061 at ducksburg.com
Tue Nov 4 14:53:07 CET 2008
On 2008-11-03, David Shaw wrote:
> Rather offtopic, but I read an interesting paper on seals a while back
> (I'm afraid I don't recall where offhand). Seals never really assured
> confidentiality. A person who wanted to open a letter would just make
> a mold of the seal, melt it free, read the letter and then re-make the
> seal using the mold.
> The countermeasure was to use multiple colors in the seal so that
> melting it free would mix up the colors so the new seal wouldn't look
> right. The catch was that you'd have to send a drawing of how the
> first seal looked using a different communications channel so the
> recipient could compare...
Hey, that sounds like a key distribution problem!
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