[Cryptography] Paper check security

[Thierry Moreau]

On 10/02/15 18:44, Arnold Reinhold wrote:
>
>> On Oct 1, 2015, at 8:52 PM, John Levine <johnl at iecc.com> wrote:
>>
> [crypto-relavance on]
>
> But if the software that people use to print their own checks added a scan-surviving cryptographic signature that included the core information (bank routing, account number, check number, date, payee, amount and whatever I’ve left out), then I argue a plain paper inkjet check would be more secure than one printed on a fancy form but without the cryptographic signature.  Note that unlike a lot of cryptographic proposals, this would be easy to implement and would not require any time-consuming standards making process to get started. One software vendor, e.g. Quicken, could pick a format and start using it. Banks would ignore of course, at least until sufficient customer demand emerged. A simple app could be used to verify the sig.  If a different standard emerges later, it can be used on new checks without need for backward compatibility.
>

So you suggest a PKI. I.e. as a check / digital signatory, I expect 
every candidate depository financial institution to act as a relying 
party for my digital signature. Maybe a certification authority in between?

Regards,

- Thierry Moreau

> Arnold Reinhold
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