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Re: Some strawman ideas for a minimum DSig profile

From: Sean Mullan <Sean.Mullan@Sun.COM>
Date: Tue, 26 Aug 2008 09:21:00 -0400
To: Kelvin Yiu <kelviny@exchange.microsoft.com>
Cc: "public-xmlsec@w3.org" <public-xmlsec@w3.org>
Message-id: <48B4033C.1010907@sun.com>

Kelvin Yiu wrote:

 > I think a
 > minimal profile would have uses beyond signing XML documents.

Can you elaborate what you mean by that?

--Sean

> Sorry for not responding last week. Things have been a little crazy
> recently.
> 
> It is certainly possible to encapsulate information in the PI into a
> new XMLDSig2 element. For example, it may be sufficient to specify
> the canonicalization and hash URI as attributes on the SignedInfo
> element so that hashing and canonicalization can start immediately.
> 
> I don't know if we can require applications to bundle a detached
> signature with an XML document in a minimum profile. I think a
> minimal profile would have uses beyond signing XML documents.
> 
> Kelvin
> 
> 
> -----Original Message----- From: Sean.Mullan@Sun.COM
> [mailto:Sean.Mullan@Sun.COM] Sent: Thursday, August 21, 2008 10:23 AM
>  To: Kelvin Yiu Cc: public-xmlsec@w3.org Subject: Re: Some strawman
> ideas for a minimum DSig profile
> 
> Hi Kelvin,
> 
> In the proposal below, you write:
> 
>> Konrad suggested using a PI at the F2F, and after looking at the 
>> situation it is the only approach we could come up with that would 
>> allow us to add semantics to the existing XMLDSIG schema without 
>> breaking it.
> 
> However, in the examples below, the only time you would potentially 
> violate the XMLDSig schema is the insertion of the instruction
> between the Signature and the SignedInfo element, which as you
> suggest is not strictly necessary, and I agree. The other PIs are
> defined outside the Signature element. Could the other PIs instead be
> encapsulated in a new XMLDSig2 element?
> 
> It also occured to me that many of these minimal processing and 
> verification issues could be solved if the xml signature was always 
> stored in a separate xml document, and somehow safely associated or 
> packaged with what it is signing (like a zip file). Then a validator 
> could first parse/verify the signature, authenticate the signer, and 
> then validate the reference digests in the document(s) in a streaming
>  manner. Has anyone thought about that and making this a requirement
> for a minimal profile?
> 
> --Sean
Received on Tuesday, 26 August 2008 13:21:52 GMT

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