En-/Decryption speed for large files (GnuPG and Gpg4win)
christoph.klassen at intevation.de
Sun Jan 15 10:52:23 CET 2023
I was testing the encryption and decryption with "pure" GnuPG and
Gpg4win to compare the speed of them. What I also wanted to find out it
how long it takes to en-/decrypt larger files.
Some details of the environment for the test:
* Windows 10
* Gpg4win 4.0.3
* CPU: Intel i5-6500 @3,20 GHz
* RAM: 16 GB
* Storage: SSD
To test the speed I created files of different sizes with a Python
script where I used the method os.urandom() to fill the files. GnuPG was
running in the PowerShell and I measured the time by using the command
"Measure-Command". To measure the time that Gpg4win needed I used a
First part of the test was the encryption of the files. To test GnuPG I
used the command "gpg -r test --encrypt ./test_file". To encrypt with
Gpg4win I used the entry "Encrypt" of the GpgEX context menu in the file
Results of encryption:
Size | GnuPG | Gpg4win
1GB | 38 sec. | 1 min. 8 sec.
1GB | 37 sec. | 1 min. 7 sec.
2GB | 1 min. 14 sec. | 2 min. 15 sec.
2GB | 1 min. 14 sec. | 2 min. 14 sec.
5GB | 3 min. 10 sec. | 6 min. 10 sec.
5GB | 3 min. 6 sec. | 5 min. 34 sec.
10GB | 6 min. 28 sec. | 11 min. 21 sec.
10GB | 6 min. 21 sec. | 11 min. 6 sec.
To decrypt the files I used the entry "Decrypt" of the GpgEX context
menu in the file explorer for Gpg4win and for GnuPG I used the command
"gpg --output test_file --decrypt test_file.gpg".
Results of decryption:
Size | GnuPG | Gpg4win
1GB | 3 sec. | 36 sec.
1GB | 3 sec. | 34 sec.
2GB | 10 sec. | 1 min. 13 sec.
2GB | 7 sec. | 1 min. 12 sec.
5GB | 22 sec. | 3 min. 1 sec.
5GB | 19 sec. | 3 min. 2 sec.
10GB | 1 min. 3 sec. | 5 min. 52 sec.
10GB | 1 min. 7 sec. | 6 min. 5 sec.
One insight of this test is that Gpg4win needs around two times longer
for encryption. For decryption the difference is much bigger.
When I was testing the decryption I also tried "gpg --decrypt
test_file.gpg" (without output file) with the 10 GB file and it took 8
minutes and 47 seconds. I was wondering why it took longer when GnuPG
didn't need to create an output file.
Did someone of you also try to en-/decrypt larger files? Maybe even
files that are larger than 1 TB? It would be really nice to know how
long GnuPG and Gpg4win are busy with such large files.
Christoph Klassen | https://www.intevation.de/
Intevation GmbH, Neuer Graben 17, 49074 Osnabrück | AG Osnabrück, HRB 18998
Geschäftsführer: Frank Koormann, Bernhard Reiter
-------------- next part --------------
A non-text attachment was scrubbed...
Size: 665 bytes
Desc: OpenPGP digital signature
More information about the Gnupg-users