GPG with SMP?

Thomas Harning Jr. harningt at
Wed Oct 5 17:01:02 CEST 2011

On Wednesday, October 5, 2011, Aaron Toponce wrote:

> On Wed, Oct 05, 2011 at 10:42:58AM -0400, Robert J. Hansen wrote:
> > On 10/5/11 10:38 AM, Thomas Harning Jr. wrote:
> > > Certain modes of AES can be safely parallelizable in both
> > > directions: CTR can be since it uses a counter value to make each
> > > encryption different for the XOR operation used.
> I didn't see this message in the thread on the list. Was this sent
> privately to Mr. Hansen?
> > CTAK encryption is not parallelizable.  Given that's the mode used in
> > GnuPG, GnuPG's symmetric encryption is not parallelizable.  There do
> > exist some parallelizable modes, but GnuPG doesn't use them.
> That's what I wanted to know. Your response makes perfect sense. Thanks.
I had done a reply-all... wonder if something's blocking it.

Mr. Hansen, thanks for the correction on CTAK, made me re-look into the
specific details of CTAK... whoops.  Should have taken a look at the OpenPGP
specification and noticed that CFB is what is used for all symmetric

Thomas Harning Jr.
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