how slow are 4Kbit RSA keys? [was: Re: multiple keys vs multiple identities]

[Jameson Rollins]

On Mon, 27 Sep 2010 15:56:52 +0200, Vjaceslavs Klimovs <vklimovs at gmail.com> wrote:
> I did some quick tests on Nokia N900 (600 MHz ARM CPU), with gnupg
> 1.4.6, here is what I got:
> 
> Encrypting and signing, 2048 bit RSA keys:
> 
> real    0m 2.50s
> user	0m 0.50s
> sys	0m 0.02s
> 
> Decrypting and verifying, 2048 bit RSA keys:
> 
> real	0m 1.74s
> user	0m 0.41s
> sys	0m 0.04s
> 
> Encrypting and signing, 4096 bit RSA keys:
> 
> real    0m 3.58s
> user	0m 1.92s
> sys	0m 0.06s
> 
> Decrypting and veryfying, 4096 bit RSA keys:
> 
> real	0m 3.80s
> user	0m 1.89s
> sys	0m 0.03s
> 
> Is one second considered a rule of thumb limit? That would mean that
> 4096 keys are not suitable for widespread use yet.

Then by that logic neither are 2048 bit keys.

jamie.
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