Suggestion for epa-mail-mode

[Richard Stallman]

epa-mail.el defines these keys:

    (define-key keymap "\C-c\C-ed" 'epa-mail-decrypt)
    (define-key keymap "\C-c\C-ev" 'epa-mail-verify)
    (define-key keymap "\C-c\C-es" 'epa-mail-sign)
    (define-key keymap "\C-c\C-ee" 'epa-mail-encrypt)
    (define-key keymap "\C-c\C-ei" 'epa-mail-import-keys)
    (define-key keymap "\C-c\C-eo" 'epa-insert-keys)

I suggest also defining C-c C-c C-d, etc,
because a sequence of all control chars is easier to type.

Is there any overall documentation of epa mode?
I want to try it, but I can't see how to use it.