"as RSA keys shorter than 1,024 bits are considered insecure, and their use in DKIM has been deprecated since the introduction of RFC 8301 in 2018."

LOL. One of my favourite internet flame wars was circa 2007 (in and around discussing the incoming financial crises) and we got talking about encryption and how none of it actually "works".

Particularly vile troll, and iirc also owner of the site bet me $50,000 I couldn't reverse the 512 RSA key he posted (created by openssl).

He got the factorisation less than an hour after he made the post.

Strangely, the entire site disappeared pretty quickly after that (and it's not on wayback machine).

given where the math guys are now with GNFS I'm not sure I would trust 8192 bit RSA in 2024, 2018 for dropping 512 bit was already more than a decade late.