This article is from the PGP FAQ, by Jeff Licquia firstname.lastname@example.org with numerous contributions by others.
Assuming that you are using a good strong random pass phrase, it is
actually much stronger than the normal mode of encryption because you
have removed RSA which is believed to be the weakest link in the
chain. Of course, in this mode, you will need to exchange secret keys
ahead of time with each of the recipients using some other secure
method of communication, such as an in- person meeting or trusted