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RE: newbie Question about PKCS#7

From: Manoj K. Srivastava <manoj@infomosaic.com>
Date: Fri, 17 May 2002 01:13:02 -0700
To: "'John Messing'" <jmessing@law-on-line.com>, "'Christian Geuer-Pollmann'" <geuer-pollmann@nue.et-inf.uni-siegen.de>, "'Tom Gindin'" <tgindin@us.ibm.com>, "'Ed Simon'" <edsimon@xmlsec.com>
Cc: "'Roman Huditsch'" <roman.huditsch@hico.com>, <w3c-ietf-xmldsig@w3.org>
Message-ID: <001601c1fd7a$ac28ff90$0400a8c0@infomosaic.net>
Hi John,

You are right.
Please see the attached signed xml. The file that was signed is also


-----Original Message-----
From: w3c-ietf-xmldsig-request@w3.org
[mailto:w3c-ietf-xmldsig-request@w3.org] On Behalf Of John Messing
Sent: Thursday, May 16, 2002 9:10 PM
To: Christian Geuer-Pollmann; Tom Gindin; Ed Simon
Cc: Roman Huditsch; w3c-ietf-xmldsig@w3.org
Subject: Re: newbie Question about PKCS#7

Wouldn't you need to include the message digest of the file in the
signed data as well and then sign the reference and the message digest
as signed info?

----- Original Message -----
From: "Christian Geuer-Pollmann"
To: "Tom Gindin" <tgindin@us.ibm.com>; "Ed Simon" <edsimon@xmlsec.com>
Cc: "Roman Huditsch" <roman.huditsch@hico.com>;
Sent: Thursday, May 16, 2002 11:05 AM
Subject: Re: newbie Question about PKCS#7

> --On Donnerstag, 16. Mai 2002 11:28 -0400 Tom Gindin 
> <tgindin@us.ibm.com>
> wrote:
> >       IMHO, XML Signature is not "the new way of doing signatures".
> > the new, and hopefully best, way of signing documents which include 
> > XML. Do you expect people to sign pure binary data using XML 
> > Signature rather than CMS?
> I would say XML Signature is a good way for creating digital 
> signatures, even detached signatures which create arbitrary binary 
> content. Even if there is no hint on what exactly IS the thing being 
> signed, the signature itself has rich semantics. But of course, XML 
> Signature will have no great future in environments where storage size

> or computing power are limited.
> > Maybe I'm confused about the standard, but I don't see a "Type" 
> > value for transparent binary data or a transform for it.  Does a 
> > Reference with both Type and Transforms omitted mean binary?
> I would say yes. Signing a GIF or something similar is
> <Reference URI="1.gif" (or URI="protocol://host/1.gif">
>  and no transforms.
> Other opinions?
> Christian

Received on Friday, 17 May 2002 04:40:06 UTC

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