>>>>> In <yotlacuzubqk.fsf@jpl.org> Katsumi Yamaoka wrote:

> ...though I presently don't have your public key.

BTW, I remembered I can fetch GnuPG public keys semi-automatically.
This was given by courtesy of ARISAWA Akihiro.

(setq pgg-query-keyserver t
      pgg-insert-url-function #'w3m-retrieve)

To use it, You need to have emacs-w3m installed.