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Re: Expiry time in Data Model

From: Eric Korb <eric.korb@accreditrust.com>
Date: Fri, 20 May 2016 08:17:10 -0400
Message-ID: <CAMX+RnCgk4mRnm6n23p0JUjcMeX5JBskEt0Q6xabenDtt_pBcw@mail.gmail.com>
To: David Chadwick <d.w.chadwick@kent.ac.uk>
Cc: Credentials Community Group <public-credentials@w3.org>
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

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*Eric R. Korb | Chief Executive Officer | Warren, New Jersey*

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On Fri, May 20, 2016 at 7:13 AM, David Chadwick <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 12:17:59 UTC

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