Funny you all should ask! I coauthored a paper about exactly this earlier this 
year:

https://eprint.iacr.org/2019/390

==Mike

> On Aug 10, 2020, at 7:06 PM, Stephen Farrell <[email protected]> 
> wrote:
> 
> 
> 
>> On 10/08/2020 23:36, Brandon Long wrote:
>> Isn't publishing the private key the opposite of recovery?
>> 
>> Ie, it's basically a mechanism for plausible deniability.
>> 
>> "The key is public, anyone could have made that message."
> 
> Yep. And for DKIM, it's a mechanism I'd myself like to see
> well-defined and used.
> 
> Cheers,
> S.
> <0x5AB2FAF17B172BEA.asc>
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