Re: [P2PSIP] HIP performance concerns (was HIP pros and cons)

[Eric Rescorla <[e-mail]>]

At Fri, 21 Dec 2007 11:38:12 +0200 (EET),
Miika Komu wrote:
> 
> On Mon, 17 Dec 2007, Ali Fessi wrote:
> 
> > Hi all,
> >
> > some questions for the HIP experts among us:
> >
> > - HIP uses a Base Exchange (BEX) with 4 messages, and the BEX contains a 
> > diffie hellman key exchange. (as you know, diffie hellman might cause some 
> > performance problems on small devices)
> 
> I gave already a reference to this list with measurement results with HIP 
> on small devices. Did you read it?
> 
> Also, I am having trouble in following your argumentation. First you say 
> that TLS is more suitable than HIP, but TLS is also using Diffie-Hellman.

Actually, TLS is sometimes Diffie-Hellman. There are pure RSA modes,
as well as ECDH modes.


> HIP offers the performance TLS. In some cases, it might even offer better 
> performance because HIP usually makes one key exchange between a pair of 
> hosts, where as TLS can exchange may require one key exchange per 
> transport layer session.

Only if you don't implement session caching, but why wouldn't you do that?

-Ekr

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