unforgeable optical tokens?

David Wagner daw at mozart.cs.berkeley.edu
Sat Sep 21 02:10:22 EDT 2002


Barney Wolff  wrote:
>Actually, it can.  The server can store challenge-responses in pairs,
>then send N as the challenge and use the N+1 response (not returned)
>as the key.

But why bother?  What does this add over just using crypto
without their fancy physical token?  The uncloneability of
their token is irrelevant to this purpose.  You might as well
just carry around a piece of paper, or a floppy disk, with a
list of keys on it.

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