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Re: [TLS] draft-ietf-tls-cached-info-02 / New "Fast-Track" draft

"Joseph Salowey (jsalowey)" <jsalowey@cisco.com> Mon, 01 March 2010 05:47 UTC

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From: "Joseph Salowey (jsalowey)" <jsalowey@cisco.com>
To: Stefan Santesson <stefan@aaa-sec.com>, Simon Josefsson <simon@josefsson.org>, Brian Smith <brian@briansmith.org>
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Cc: tls@ietf.org
Subject: Re: [TLS] draft-ietf-tls-cached-info-02 / New "Fast-Track" draft
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Hi Stefan,

What is the disadvantage if the client cannot cache information from a
handshake in which the server does not include the hash?  

Thanks,

Joe

> -----Original Message-----
> From: tls-bounces@ietf.org [mailto:tls-bounces@ietf.org] On Behalf Of
> Stefan Santesson
> Sent: Friday, February 26, 2010 4:11 AM
> To: Simon Josefsson; Brian Smith
> Cc: tls@ietf.org
> Subject: Re: [TLS] draft-ietf-tls-cached-info-02 / New "Fast-Track"
draft
> 
> Simon and Brian,
> 
> On 10-02-26 10:38 AM, "Simon Josefsson" <simon@josefsson.org> wrote:
> 
> >> My second suggestion is to have the server calculate the hash, and
> >> give the calculated hash to the client along with the content. Then
> >> the client and the server don't have to agree on any algorithms at
> >> all, and the server can choose whatever algorithm it wants.
> >
> > I like this approach.  The server gets to chose the hash, and the
client
> > will have to comply.  It is easy to implement, and it is possible to
> > transition to other checksum algorithms over time.
> 
> 
> I'm sorry, but this seems like a really bad idea.
> 
> The idea of this draft is that a client should be able to cash
information
> form a perfectly normal handshake (one where the server does not
provide a
> hash that may represent what it sends).
> 
> /Stefan
> 
> 
> 
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