4 GnuPG Version Compatibility

As of June 2023, there are three active branches of GnuPG: 2.4, 2.2, and 1.4. GnuPG versions 2.4.1 and later suffer from GnuPG bug T6481 and are hardly usable with Emacs. There is a patch for that bug available at least for GnuPG version 2.4.1, which your operating system or distribution might provide already. GnuPG 1.4 is considered a legacy version.

Besides that, all of those branches mentioned above should work flawlessly with Emacs with basic use-cases. They have, however, some incompatible characteristics, which might be visible when used from Emacs.