about physical watermarking, redux
coderman at protonmail.com
Mon Aug 2 13:49:12 PDT 2021
-----BEGIN PGP SIGNED MESSAGE-----
‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
On Sunday, August 1st, 2021 at 3:54 PM, Sampo Syreeni <decoy at iki.fi> wrote:
> Many years ago I posted an idea of mine about cryptographic physical
> watermarking of things, such as paper money, or maybe missiles. Whatnot.
> The idea was that you'd do some chaotic physical process in order to lay
> down a physical watermark, then image it, and finally digitally sign
> what was seen via asymmmetric cryptography.
> My first and best idea about how to make this physical nonce is to mix a
> couple of dozen well cut differently fluorescent plastic fibers into the
> paper or plastic fiber pulp from which the bill/artifact is made.
check out physically unclonable functions:
[ https://en.wikipedia.org/wiki/Physical_unclonable_function ]
in particular optical PUFs. check out the integrated PUF from
consumer hardware in this paper :)
-----BEGIN PGP SIGNATURE-----
-----END PGP SIGNATURE-----
More information about the cypherpunks