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Subject: RE: [xri] Comment on call re: algorithm agility


Thanks, Scott. I agree that referencing a signature standard that can
independently evolve (and implementations can track it) is better than
creating our own.

I'd just like to make sure we can address the concerns such as Nat's that we
not go down a path that will exclude certain communities where we really
want to see XRD signatures adopted. Discovery really is a bootstrap layer
for trust, which is why this decision is so important for the TC.

=Drummond 

> -----Original Message-----
> From: Scott Cantor [mailto:cantor.2@osu.edu]
> Sent: Thursday, June 11, 2009 9:47 PM
> To: 'Drummond Reed'; 'XRI TC'
> Subject: RE: [xri] Comment on call re: algorithm agility
> 
> Drummond Reed wrote on 2009-06-12:
> > So Scott, from a spec standpoint, what does this mean we should/should
> not
> > do in the XRD 1.0 spec?
> 
> I was making two points, one purely pragmatic.
> 
> Whatever/however signing is done, SHA-256 should probably be the
> recommended
> or MTI digest algorithm for hashing and as part of the RSA operation.
> (With
> XML Signatures, you have to pay attention to both the digest alone for the
> Reference and then as part of the signature over SignedInfo.)
> 
> The other argument was that reinventing signatures in each standard leads
> to
> greater effort in achieving agility across the full stack of code you're
> deploying.
> 
> -- Scott
> 
> 
> 
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