From mboxrd@z Thu Jan 1 00:00:00 1970 X-Msuck: nntp://news.gmane.io/gmane.emacs.gnus.general/55118 Path: main.gmane.org!not-for-mail From: spamtrap@koldfront.dk (=?iso-8859-1?q?Adam_Sj=F8gren?=) Newsgroups: gmane.emacs.gnus.general Subject: Re: Encrypting outgoing message but not Gcc? Date: Sun, 07 Dec 2003 02:54:50 +0100 Organization: koldfront - analysis & revolution, Copenhagen, Denmark Sender: ding-owner@lists.math.uh.edu Message-ID: <87r7zh8k9h.fsf@virgil.koldfront.dk> References: <87vfot99o1.fsf@virgil.koldfront.dk> NNTP-Posting-Host: deer.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable X-Trace: sea.gmane.org 1070762146 16449 80.91.224.253 (7 Dec 2003 01:55:46 GMT) X-Complaints-To: usenet@sea.gmane.org NNTP-Posting-Date: Sun, 7 Dec 2003 01:55:46 +0000 (UTC) Original-X-From: ding-owner+M3658@lists.math.uh.edu Sun Dec 07 02:55:44 2003 Return-path: Original-Received: from malifon.math.uh.edu ([129.7.128.13]) by deer.gmane.org with esmtp (Exim 3.35 #1 (Debian)) id 1ASo99-00062E-00 for ; Sun, 07 Dec 2003 02:55:43 +0100 Original-Received: from localhost ([127.0.0.1] helo=lists.math.uh.edu) by malifon.math.uh.edu with smtp (Exim 3.20 #1) id 1ASo8R-0005s4-00; Sat, 06 Dec 2003 19:54:59 -0600 Original-Received: from justine.libertine.org ([66.139.78.221] ident=postfix) by malifon.math.uh.edu with esmtp (Exim 3.20 #1) id 1ASo8M-0005rz-00 for ding@lists.math.uh.edu; Sat, 06 Dec 2003 19:54:54 -0600 Original-Received: from main.gmane.org (main.gmane.org [80.91.224.249]) by justine.libertine.org (Postfix) with ESMTP id 62FE73A0084 for ; Sat, 6 Dec 2003 19:54:53 -0600 (CST) Original-Received: from list by main.gmane.org with local (Exim 3.35 #1 (Debian)) id 1ASo8K-0003H2-00 for ; Sun, 07 Dec 2003 02:54:52 +0100 X-Injected-Via-Gmane: http://gmane.org/ Original-To: ding@gnus.org Original-Received: from sea.gmane.org ([80.91.224.252]) by main.gmane.org with esmtp (Exim 3.35 #1 (Debian)) id 1ASo8J-0003Gu-00 for ; Sun, 07 Dec 2003 02:54:51 +0100 Original-Received: from news by sea.gmane.org with local (Exim 3.35 #1 (Debian)) id 1ASo8J-0004G6-00 for ; Sun, 07 Dec 2003 02:54:51 +0100 Original-Lines: 48 Original-X-Complaints-To: usenet@sea.gmane.org X-Face: YR:#}ygvn> My archived copies are encrypted with the recipients as well as my >> own public-key, so I can read them myself. >> I don't think I've done anything special to make Gnus do that. > Hmm ... as I mentioned in my other message a few minutes ago, I seem > to need the _recipient's_ passphrase in order to decrypt my archived > copies, even with the latest CVS of Gnus. Ah, now I remember - sorry, I've been misinforming about the "done anything special part"; actually I've put: encrypt-to asjo@koldfront.dk in my ~/.gnupg/options. > Also, I think there's a gap somewhere in my understanding of all > this. How can it be that something encrypted twice, once with the > recipient's public key and once with yours, would only need your > private key to be decrypted? Wouldn't there have to be two > decryptions, one for each of the previous encryptions? Or in this > case, is the encryption done with some sort of mathematical > combination of both public keys, such that either corresponding > private key can decrypt it? I'm not able to adequately and comprehensibly explain the theory, but I think it's a proporty of either assymetric key cryptography in general or the way PGP/GnuPG is constructed (the latter being less likely, probably, perhaps). ,----[ From man gpg ] | --encrypt-to name | Same as --recipient but this one is intended for use in the | options file and may be used with your own user-id as an | "encrypt-to-self". These keys are only used when there are | other recipients given either by use of --recipient or by | the asked user id. No trust checking is performed for these | user ids and even disabled keys can be used. `---- Best regards, --=20 "Do not feed the oysters under the clouds" Adam Sj=F8gren asjo@koldfront.dk