bug#58472: [PATCH] Make `message-unique-id' less prone to collisions

[Stefan Kangas]

Matt Armstrong <matt@rfc20.org> writes:

> Inspired by https://nullprogram.com/blog/2010/05/11/ and the code linked
> there (https://nullprogram.com/download/uuid.el) I came up with this:

That's pretty neat!

> One question: I'm not sure that (random (exp 2 512)) actually gives more
> entropy than a simple call to (random).  It depends on Emacs' RNG.  Last
> I checked there was code still calling something like rand(), which
> generally not intended for this purpose.

Ouch, indeed.  I think we should use the stuff Paul pointed to, which
AFAICT just punts to Gnulib.