[ILUG] ssh ciphers

[Ciaran Johnston]

Hugh Mc Gauran said:
> I believe that 3DES is triple encryption..I am not 100% on this.
> So 14.3 as against 5 would be about right I think

3DES is three rounds of DES, the Data Encryption Standard, and therefore is
three rounds of 54(?) bit encryption. Blowfish has a variable length key,
from 32 to 448 bits, so I suppose the key length would have an impact on
speed. Any ideas what key length is used in scp?

/Ciaran.
>
> --
> regards
> hugh
>
> -----Original Message-----
> From: Stephen Shirley [mailto:diamond at skynet.ie]
> Sent: 02 October 2002 14:42
> To: Irish Linux Users Group
> Subject: [ILUG] ssh ciphers
>
> Hi,
> 	I regularly have to transfer files to and from a box across the net
> using scp. I've always found it to be pretty damn slow for this.
> Someone (i think mr. brady, but i don't have the evidence to hand)
> suggested that i try specifying that ssh use the blowfish cipher
> instead of the default 3des. I decided to compare them, and found some
> interesting results:
>
> 	41 megs file d/l. From a dual p3-450 to a p3-800.
> 	3 runs each, with a pre-test run to make sure file was cached.
>
> 	3des: 14.3s
> 	blowfish: 5s
>
> I have to say i was very susprised at the almost 3x speed difference. I
> certainly know which i'll be using in future.
>
> Steve
> --
> High salt diets are bad for you - but only outside marriage.
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