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Re: Expiry time in Data Model

From: David Chadwick <d.w.chadwick@kent.ac.uk>
Date: Fri, 20 May 2016 19:04:25 +0100
To: Jason Weaver <jweaver@parchment.com>, Eric Korb <eric.korb@accreditrust.com>
Cc: Credentials Community Group <public-credentials@w3.org>
Message-ID: <0765b89b-da8b-051c-6777-71cf70bdd6a1@kent.ac.uk>
HI Jason

yes that is correct. I think 'expires' should be mandatory on the
credential message and not need to be on the embedded claims (unless
these are different for each claim)

regards

David

On 20/05/2016 18:39, Jason Weaver wrote:
> Hi, Eric, David.
> 
> I think the distinction David is making about a requirement on the
> expiration of the claim message, versus the expiration of the claim
> content itself that OB expire refers to and makes optional, correct?
> 
> Thank you,
> Jason
> *--*
> 
> *JASON WEAVER *| DIRECTOR, DIGITAL CREDENTIALS STRATEGY
> CO-CHAIR, PESC EDUCATION RECORD USER GROUP
> jweaver@parchment.com <mailto:jweaver@parchment.com>
> direct 480.719.1646 <tel:480.719.1646>* *ext. 1017
> 6263 North Scottsdale Road, Suite 330, Scottsdale, AZ 85250
> 
> *Parchment *|* *Turn Credentials into Opportunities
> www.parchment.com <http://www.parchment.com/>
> 
> 
> On Fri, May 20, 2016 at 7:17 AM, Eric Korb <eric.korb@accreditrust.com
> <mailto:eric.korb@accreditrust.com>> wrote:
> 
>     David,
> 
>     Great question.  The JSON-LD model allow us to leverage the
>     OpenBadges  - "expire" property found in their vocabulary.
> 
>     ,
>         "http://w3id.org/openbadges/v1expires": [
>           {
>             "@value": "2020-05-05T21:53:01Z"
>           }
>         ],
> 
>     Digital Credential validation tools then need to evaluate the property.
> 
>     Eric  
> 
>     ------------------------------------------------------------------------
>     TrueCred™ | Digital Credential Trust™
>     ------------------------------------------------------------------------
> 
>     *Eric R. Korb | Chief Executive Officer | Warren, New Jersey*
> 
> 
>     <https://mail.google.com/>
> 
>     On Fri, May 20, 2016 at 7:13 AM, David Chadwick
>     <d.w.chadwick@kent.ac.uk <mailto:d.w.chadwick@kent.ac.uk>> wrote:
> 
>         Hi Manu
> 
>         Can ask why a verifiable claim does not have an expiry time as a
>         mandatory component? Whilst the attribute itself may not expire
>         e.g. a
>         university degree, nevertheless the electronic representation of the
>         claim should have an expiry time due to the inherent weaknesses in
>         cryptographic systems and the need to continually increase key
>         sizes,
>         improve algorithms etc.
> 
>         Without an expiry time the issuer may have to keep revocation
>         information for ever.
> 
>         regards
> 
>         David
> 
> 
> 
> 
> 
Received on Friday, 20 May 2016 18:04:58 UTC

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