The difficult thing is tying the signature to the thing signed. Even if they are single-use, unless the relying party sees everything you ever sign immediately, such a signature can be transferred to something you didn’t sign from something you signed that the relying party didn’t see.
The idea is that the device would have a camera, and do ocr on the text, hash that, incorporate that into the stamp design somehow, then you’d stamp it
The difficult thing is tying the signature to the thing signed. Even if they are single-use, unless the relying party sees everything you ever sign immediately, such a signature can be transferred to something you didn’t sign from something you signed that the relying party didn’t see.
What if the signature contains a hash of the document it was created for, so that it will not match a different document if transferred?
I thought you wanted to sign physical things with this? How will you hash them? Otherwise, how is this different from a standard digital signature?
The idea is that the device would have a camera, and do ocr on the text, hash that, incorporate that into the stamp design somehow, then you’d stamp it