Adding a nounce before hashing as covert channel

[Wiktor Kwapisiewicz]

Hi Andrew,

On 12.12.2024 11:43, Andrew Gallagher via Gnupg-devel wrote:
> It should be noted that the salt in v6 signatures also helps to protect 
> against fault-based attacks. See https://eprint.iacr.org/2017/1014

I'm not entirely sure that the v6 salt helps in this case - it 
influences the final digest but the fault attack then operates on that 
new digest. I've read section 9. Countermeasures and couldn't find any 
mention of salt being effective.

Of course, the obligatory disclaimer: I'm not a cryptographer and it'd 
be nice to hear one voice their opinion and arguments.

Kind regards,
Wiktor