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Re: Expiry time in Data Model

From: David Chadwick <d.w.chadwick@kent.ac.uk>
Date: Sat, 21 May 2016 19:44:38 +0100
To: public-credentials@w3.org
Message-ID: <e71c14fa-6e00-f4bc-0818-231e2d5ceb7b@kent.ac.uk>


On 21/05/2016 12:56, Victoriano Giralt wrote:
> On 20/05/16 22:35, David Chadwick wrote:
>>> what is an example of a credential that's irrevocable?
>>
>> Any short lived one, where the time/overhead of revocation is comparable
>> with the lifetime
> 
> Stupid question: wouldn't a birth certificate be an irrevocable
> credential? It is a fact of life that any person is born, you can (and
> will) die, but your birth a fact that existed in a given point in time.
> 

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.

regards

David
Received on Saturday, 21 May 2016 18:45:11 UTC

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