GPG with GPUs

[Kristian Fiskerstrand]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

On 2012-06-17 20:50, Peter Lebbing wrote:
> On 17/06/12 19:26, Hauke Laging wrote:
>> start cmd:> time gpg --encrypt --sign 200k-file
>> 
>> Sie benötigen eine Passphrase, um den geheimen Schlüssel zu
>> entsperren. Benutzer: "Hauke Laging <hauke at laging.de>" 2048-Bit
>> RSA Schlüssel, ID 0x3A403251, erzeugt 2010-03-04
>> (Hauptschlüssel-ID 0xECCB5814)
>> 
>> 
>> real    0m0.143s user    0m0.086s sys     0m0.008s
> 
> The OP said he encrypted to about 50 recipients. With such a small
> file, the asymmetric operation will be way more significant in the
> total time than if the file were much larger. You seem to be
> encrypting to only one recipient (you have a default-recipient?),
> so the comparison is way off.
> 
> Furthermore, you'll need to establish the key size and asym cipher
> used for the recipients before you can do a fair comparison.
> Because a tin-foil hat RSA 16k key will be a bit more intensive
> than a 1k DSA key ;).
> 

Indeed, the number of recipients and their key parameters will be
significant for the time to encrypt.

Somewhat off-topic, but to provide a measurement for an encryption and
signing using a tin-foil hat key of 15360 bit key, since I for various
reasons keep one around in the first place, and don't really get to
use it too often;

On my email VM, which has 4 cores and 4 GB of RAM, the measurements
are as follows:

kristianf at ubuntu:~$ dd if=/dev/urandom bs=1024 count=200 > 200kfile

kristianf at ubuntu:~$ time gpg2 -aser 43E67CF7 200kfile
real    0m2.321s
user    0m2.310s
sys     0m0.000s

where:
kristianf at ubuntu:~$ gpg --list-key 43e67cf7
pub   15360R/43E67CF7 2006-12-15
uid                  Kristian Fiskerstrand
<kristian.fiskerstrand at kfwebs.net>
uid                  Kristian Fiskerstrand (Large key) <kf at kfwebs.net>
sub   15360g/7CC80A28 2006-12-18





- -- 
- ----------------------------
Kristian Fiskerstrand
http://www.sumptuouscapital.com
Twitter: @krifisk
- ----------------------------
Corruptissima re publica plurimæ leges
The greater the degeneration of the republic, the more of its laws
- ----------------------------
This email was digitally signed using the OpenPGP
standard. If you want to read more about this
The book: Sending Emails - The Safe Way: An
introduction to OpenPGP security is now
available in both Amazon Kindle and Paperback
format at
http://www.amazon.com/dp/B006RSG1S4/
- ----------------------------
Public PGP key 0xE3EDFAE3 at http://www.sumptuouscapital.com/pgp/


-----BEGIN PGP SIGNATURE-----
Version: GnuPG v2.0.19 (MingW32)
Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/
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=Gfdf
-----END PGP SIGNATURE-----