Re: about physical watermarking, redux

2021-08-02 Thread coderman
-BEGIN PGP SIGNED MESSAGE- Hash: SHA512 hello Sampo! ‐‐‐ Original Message ‐‐‐ On Sunday, August 1st, 2021 at 3:54 PM, Sampo Syreeni wrote: > Many years ago I posted an idea of mine about cryptographic physical > watermarking of things, such as paper money, or maybe missiles.

Re: about physical watermarking, redux

2021-08-01 Thread grarpamp
On 8/1/21, jim bell wrote: > People were to fill out the cards and return them to the manufacturer to > re-scan. I think the intent was that it would be impossible to fake the > card, because the information was embedded in the fibers in the structure of > the card itself. If anybody tried to

Re: about physical watermarking, redux

2021-08-01 Thread jim bell
On Sunday, August 1, 2021, 04:37:58 PM PDT, Sampo Syreeni 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

Re: about physical watermarking, redux

2021-08-01 Thread Karl Semich
Hi Sampo, Thanks for your normal post to this list. I'm not a cryptographer but I find your idea interesting. I think these ideas came up a lot when people were imagining making cryptocurrency coins and bills. On Sun, Aug 1, 2021, 7:37 PM Sampo Syreeni wrote: > Many years ago I posted an

Re: about physical watermarking, redux

2021-08-01 Thread grarpamp
Are you trying to make a physical cryptocurrency? You've defined electronic dependencies, features, sigs, etc. So how are people to do authentication? That would be against a central service, or against a central entity. Then how do you do issuance? How trust against printflation, etc? Then if

about physical watermarking, redux

2021-08-01 Thread Sampo Syreeni
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