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Re: [saag] post-X509 cryptographic identities

Henry Story <henry.story@gmail.com> Fri, 14 February 2020 20:42 UTC

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From: Henry Story <henry.story@gmail.com>
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Date: Fri, 14 Feb 2020 21:42:44 +0100
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References: <26497.1581418516@dooku> <20200212002125.GO18021@localhost> <alpine.DEB.2.20.2002131443470.25433@grey.csi.cam.ac.uk> <20200213171324.GP18021@localhost> <d3d01f1f-5784-da84-1c59-e636d349bd2a@netmagic.com> <20200213175626.GR18021@localhost> <65357327-e2d7-89cc-221e-ed8ac2875048@netmagic.com> <A91F5BD6-BFBA-4BA7-9158-3F41A8F0F7D9@gmail.com> <20200213191952.GS18021@localhost> <9FEBBD2A-3578-436A-92E3-192CADC9FA8B@gmail.com> <20200213205158.GT18021@localhost> <CAMm+LwhAXWbVL=j3Cek_Sf9eK-aKsQgZ+Gsh55nP3nvur_JSEQ@mail.gmail.com>
To: Phillip Hallam-Baker <phill@hallambaker.com>
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Subject: Re: [saag] post-X509 cryptographic identities
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> On 14 Feb 2020, at 20:44, Phillip Hallam-Baker <phill@hallambaker.com> wrote:
> 
> Syntax is the least important part of PKI but it is a part of the puzzle. Why oh why do people think canonicalization is relevant? If you want to be able to verify a signature, you have to keep the original bits that were signed. End of story.

The way to make syntax unimportant is to work on the semantic level. That is
in a way what the Semantic Web does by starting from naming, and leaving syntax decisions open, allowing multiple ones: RDF/XML, JSON-LD, Turtle, NTriples, Binary RDF, CSV …

But once one moves away from syntax it then becomes very important
to canonicalize data, exactly so as to move away from being tied to syntax.
A Canoncicalisation of a data then allows one even to discard the original
bytes, if one does not wish to keep to versions of everything around.

See 
  https://json-ld.github.io/normalization/spec/
and it’s use for signatures
  https://w3c-dvcg.github.io/ld-signatures/

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