W3C home > Mailing lists > Public > public-credentials@w3.org > May 2016

Re: Expiry time in Data Model

From: David Chadwick <d.w.chadwick@kent.ac.uk>
Date: Sun, 22 May 2016 15:08:49 +0100
To: Timothy Holborn <timothy.holborn@gmail.com>, public-credentials@w3.org
Message-ID: <ee88b6e9-40bb-b2eb-568b-95cb71c3e8cd@kent.ac.uk>


On 22/05/2016 14:56, Timothy Holborn wrote:
> 
> 
> On Sun, 22 May 2016 at 23:30 David Chadwick <d.w.chadwick@kent.ac.uk
> <mailto:d.w.chadwick@kent.ac.uk>> wrote:
> 
> 
> 
>     On 22/05/2016 13:26, Timothy Holborn wrote:
>     > What about version control and therein; 'get latest'...
> 
>     I dont think this is needed when have an issuing time and expiry time.
>     You can tell from the former which is the latest credential
> 
> 
> If a new version is released, then the older version has expired? 

Not necessarily. It depends upon the expiry time. It is frequently the
case that I have had two credit cards from the same bank that are both
valid simultaneously, and I am asked to cut up the older one. But I can
continue to use it for a week or two if I wish.

regards

David



> 
> Tim.H.
>  
> 
>     regards
> 
>     David
>     >
>     > On Sun, 22 May 2016 at 22:01 Victoriano Giralt <victoriano@uma.es
>     <mailto:victoriano@uma.es>
>     > <mailto:victoriano@uma.es <mailto:victoriano@uma.es>>> wrote:
>     >
>     >     On 21/05/16 20:44, David Chadwick wrote:
>     >     > You are mixing up the attribute/claim, date of birth (or
>     similar)
>     >     which
>     >     > lasts forever, and the credential, which is a cryptographic
>     digital
>     >     > representation of it. This has to have an expiry time due to the
>     >     > inherent weakness of the crypto.
>     >
>     >     You are very right, David, it is possibly me being thick
>     because of the
>     >     cabin pressure. I should read threads twice before responding
>     from a
>     >     plane :-) You already noted that in the thread, and you are right,
>     >     signatures should be refreshed because of crypto.
>     >
>     >     > regards
>     >
>     >     double those ;-)
>     >
>     >     --
>     >     Victoriano Giralt                             CIO
>     >                                                   University of Malaga
>     >     +34952131415                                  SPAIN
>     >     ==================================================================
>     >     Note: signature.asc is the electronic signature of present message
>     >     A: Yes.
>     >     > Q: Are you sure ?
>     >     >> A: Because it reverses the logical flow of conversation.
>     >     >>> Q: Why is top posting annoying in email ?
>     >
> 
Received on Sunday, 22 May 2016 14:09:22 UTC

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