about physical watermarking, redux

[coderman]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512

hello Sampo!


‐‐‐‐‐‐‐ 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 :)
 - https://eprint.iacr.org/2013/215.pdf


best regards,

-----BEGIN PGP SIGNATURE-----

iNUEAREKAH0WIQRBwSuMMH1+IZiqV4FlqEfnwrk4DAUCYQhaGl8UgAAAAAAuAChp
c3N1ZXItZnByQG5vdGF0aW9ucy5vcGVucGdwLmZpZnRoaG9yc2VtYW4ubmV0NDFD
MTJCOEMzMDdEN0UyMTk4QUE1NzgxNjVBODQ3RTdDMkI5MzgwQwAKCRBlqEfnwrk4
DD58AP402kQPTbjDJzMzm3uc4Dj6OXRIOzTTy7QtOuOLSSY3VwEAiZN78MRdUgdP
vsRruJOiGaJH9S0IUfM6HnwB+eQv5Yg=
=JnyH
-----END PGP SIGNATURE-----