[Cryptography] IDs and licenses, not Possible reason why password usage rules

[Howard Chu]

John Levine wrote:
> In article <66f70bd6-4b3d-1b64-8ab1-93137186097d at symas.com> you write:
>> John Levine wrote:
>>> In article <69b8ae4f-962c-a1d6-9532-99bef1a8a1db at symas.com> you write:
>>>> This one is easy - you can't travel with an expired photo ID because the possibility
>>>> exists that someone else is already traveling with the valid ID.
>>>
>>> Assuming the someone else isn't your identical twin, could you explain
>>> in more detail how that works? ...
> 
>> An expired photo ID has to be considered the same as a forged ID or a
>> counterfeit, because there's a high probability that the corresponding
>> new/renewed ID exists and is in circulation.
> 
> I'm sorry, but this assertion bears no relation to any ID system with
> which I am familiar.

>> IDs have to be unique.
> 
> I think we mean radically different things by "ID" and you are confusing
> an ID with a license.

The discussion here is why you can't use an expired photo ID for travel.
Doesn't matter whether it's a driver's license or some other government
issued ID.

> If the question is "is this John who claims to be 65 years old" and I
> look like the somewhat younger guy in the picture, it's an ID and the
> license number and expiration date is irrelevant.  It's identified me.

It *might* have identified you. It may be that you're John's brother who's
wanted for murder, trying to leave the country, and John actually has
the currently valid ID in his possession.

-- 
  -- Howard Chu
  CTO, Symas Corp.           http://www.symas.com
  Director, Highland Sun     http://highlandsun.com/hyc/
  Chief Architect, OpenLDAP  http://www.openldap.org/project/