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Re: Proposed draft RDF Graph vocabulary

From: Jeremy Carroll <jjc@hplb.hpl.hp.com>
Date: Wed, 24 Mar 2004 16:28:36 +0000
Message-ID: <4061B734.2070908@hplb.hpl.hp.com>
To: Chris Bizer <chris@bizer.de>
Cc: Patrick Stickler <patrick.stickler@nokia.com>, www-archive@w3.org, Pat Hayes <phayes@ihmc.us>

Chris Bizer wrote:

>>>Using signatures also don't make signing agents special (=owners),
>>>because
>>>several agent can sign the same named graph instance.
>>
>>True, and then they are joint owners/publishers, if that signing occurs
>>in the graph itself.
>>
> 
> 
> Initial comment: The signature of a graph can not be included into the graph
> for technical reasons.
> 
> 
> 
> Signing a graph works the following way:
> 
> 
> 
> 1. You take a graph
> 
> 2. You calculate the hash of it
> 
> 3. then you encrypt the hash using your private key.
> 
> 
> 
> Having the signature inside the graph makes it impossible to calculate the
> hash, because things are getting circular.
> 
> 

This doesn't matter you just need to exclude that triple (the one with the 
signature) as a special case ... maybe it's better to replace the triple 
with an empty signature triple ...

_:w swp:signature ""^^xsd:base64Encoded .

then it is clear where you need to put it back again.

Jeremy
Received on Wednesday, 24 March 2004 11:41:32 UTC

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