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- AES and DSA speeds
- Ignacio G.T.
February 23, 2006, 2:15 pm
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I have a very practical question. One year ago we developed an embedded
system which had to perform DSA signatures by software on some messages
(about 100 bytes long).
We used 512 bits key for this. This takes our modest general-purpose CPU
about 10 seconds per message.
Now, we have to encrypt some of these messages. We are planning to use
AES with 128 or 256 bits keys.
And the question is: approximately, how much time should we expect this
encryption to take? Much more than 10 seconds? Much less? Same order of
When I first met encryption 10 years ago, it was "popular wisdom" that
simmetric key algorithms (like DES) were faster than public key ones
(like DSA or RSA). But AES was inexistent then, and I don't know if its
speed compares favourably to DES's speed or not.
I know that the correct answer depends on the implementation, so I am
asking only for a rough estimate.
Pointers are welcome. Many thanks.
February 24, 2006, 7:36 am
- Lassi =?ISO-8859-15?Q?Hippel=E
February 24, 2006, 3:25 pm
Re: AES and DSA speeds
Please explain, what kind of CPU you're using.
Wenn Du "Ich sehe die Mathematik als einzigen Bereich an, wo es klare
Beweise gibt." und "Ich fuehle mich in einem Anzug unwohl." als Aussagen
mit aequivalentem Meinungsinhalt betrachtest, hast Du mit Deinem Gleichnis
recht. (Michail Bachmann zu Thomas Wallutis in d.a.s.r)