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+Return-Path: <obnam-dev-bounces@obnam.org>
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+Date: Sun, 19 Jun 2016 09:09:47 +0000
+From: "Robin H. Johnson" <robbat2@orbis-terrarum.net>
+To: "Robin H. Johnson" <robbat2@gentoo.org>
+Message-ID: <robbat2-20160619T083928-020175588Z@orbis-terrarum.net>
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+Cc: obnam-support@obnam.org, obnam-dev@obnam.org
+Subject: [2/2] GPG & performance: future options
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+
+--===============7343743822476944253==
+Content-Type: multipart/signed; micalg=pgp-sha1;
+ protocol="application/pgp-signature"; boundary="it/zdz3K1bH9Y8/E"
+Content-Disposition: inline
+
+
+--it/zdz3K1bH9Y8/E
+Content-Type: text/plain; charset=us-ascii
+Content-Disposition: inline
+Content-Transfer-Encoding: quoted-printable
+
+In part #1, we looked at GPG performance, and some of what could be done
+to speed it up right away.
+
+The root problem here is that GPG is expensive:
+- execve() has a cost [2]
+- all of the initialization has a cost [2]
+- the S2K encoding has a cost.
+
+I did a very quick hack to use PyCrypto's AES-256-CTR [3] for the symmetric
+layer, and it showed tremendous promise (one_big_file: 10s baseline, 33s
+pycrypto, 250-270s gpg)
+
+What this DOES require, is that we need one of the following:
+A) enciphered chunks must be self-describing (eg GPG S2K packet format
+   that bundles the parameters)
+B) chunk encipherment parameters must be stored in a manner they can be
+   associated per-block.
+
+Example parameters to store:
+- Method (GPG, PyCrypto, Keyczar, NaCl...)
+- cipher & blocksize
+- key stretching if any [1]
+- IV/counter
+- checksum/HMAC of enciphered data block [without header] for
+  validation.
+- compression layer under the encipherment
+
+It's theoretically safe to have all of these parameters public, but I
+don't see a significant loss if they were wrapped with the master key
+
+[1] S2K does key-stretching by default, but since our symmetric keys are
+actually purely random, we could consider turning it off and using pure
+binary keys.
+
+[2] I did look at ways of getting around the GPG startup overhead, and
+the Assuan protocol is _very_ promising [in fact it'll help the
+asymmetric operations a lot]. However it doesn't support symmetric modes
+at all, and can't do parallizable-AES like CTR & GCM.
+
+[3] I used what was available off-the-shelf in PyCrypto and known to be
+fast. PyCrypto doesn't include any of the newer Authenticated modes like
+GCM/EAX/CCM in a stable release yet, it got stuck on 2.7alpha1 :-(.
+
+--=20
+Robin Hugh Johnson
+E-Mail     : robbat2@orbis-terrarum.net
+Home Page  : http://www.orbis-terrarum.net/?l=3Dpeople.robbat2
+ICQ#       : 30269588 or 41961639
+GnuPG FP   : 11ACBA4F 4778E3F6 E4EDF38E B27B944E 34884E85
+
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+Content-Description: Digital signature
+
+-----BEGIN PGP SIGNATURE-----
+Version: GnuPG v2.1
+Comment: Robbat2 @ Orbis-Terrarum Networks - The text below is a digital signature. If it doesn't make any sense to you, ignore it.
+
+iKYEARECAGYFAldmYVpfFIAAAAAALgAoaXNzdWVyLWZwckBub3RhdGlvbnMub3Bl
+bnBncC5maWZ0aGhvcnNlbWFuLm5ldDc1OTQwNEJFQkQ0MUY3MTIzODIzODZFRjNF
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+=pQMQ
+-----END PGP SIGNATURE-----
+
+--it/zdz3K1bH9Y8/E--
+
+
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+Content-Type: text/plain; charset="us-ascii"
+MIME-Version: 1.0
+Content-Transfer-Encoding: 7bit
+Content-Disposition: inline
+
+_______________________________________________
+obnam-dev mailing list
+obnam-dev@obnam.org
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+
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+
diff --git a/tickets/3092ee8cdf8e49fda9937a228d0546fd/Maildir/tmp/.this-dir-not-empty/.empty/empty-file b/tickets/3092ee8cdf8e49fda9937a228d0546fd/Maildir/tmp/.this-dir-not-empty/.empty/empty-file
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diff --git a/tickets/3092ee8cdf8e49fda9937a228d0546fd/ticket.yaml b/tickets/3092ee8cdf8e49fda9937a228d0546fd/ticket.yaml
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+++ b/tickets/3092ee8cdf8e49fda9937a228d0546fd/ticket.yaml
@@ -0,0 +1,4 @@
+ticket-id:
+- 3092ee8cdf8e49fda9937a228d0546fd
+title:
+- '[2/2] GPG & performance: future options'