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Re: [Rats] About (E)UID's

Simon Frost <Simon.Frost@arm.com> Wed, 12 February 2020 14:08 UTC

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From: Simon Frost <Simon.Frost@arm.com>
To: Laurence Lundblade <lgl@island-resort.com>
CC: "Smith, Ned" <ned.smith@intel.com>, "Salz, Rich" <rsalz@akamai.com>, "rats@ietf.org" <rats@ietf.org>
Thread-Topic: [Rats] About (E)UID's
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Archived-At: <https://mailarchive.ietf.org/arch/msg/rats/L-ZQ5JRPdJGsLX4g8ydQUc3lWQc>
Subject: Re: [Rats] About (E)UID's
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Sorry, missed this while replying to Michael – see my just posted response which should enlarge on my original comment.

I don’t think probabilistic uniqueness can be relied upon globally. However it should be reliable where other information, either implicit from the use case or explicit by the use of other information establishes a more reliable locus.

I agree no one will want to pay fees to, or take liability for, a registry for global uniqueness on an instance level.


From: Laurence Lundblade <lgl@island-resort.com>
Sent: 12 February 2020 12:33
To: Simon Frost <Simon.Frost@arm.com>
Cc: Smith, Ned <ned.smith@intel.com>; Salz, Rich <rsalz@akamai.com>; rats@ietf.org
Subject: Re: [Rats] About (E)UID's


On Feb 11, 2020, at 3:39 PM, Simon Frost <Simon.Frost@arm.com<mailto:Simon.Frost@arm.com>> wrote:

I suggest we should change the description of the UEID claim to allow the standard to support more interpretations of what the locus of uniqueness might be to an implementation.

Hi Simon,

Can you say more and / or give an example?

The design goal of UEID is global / universal uniqueness — the locus is everything. It offers the vendor two paths to achieving this.

1) Probabilistically unique large random values that need to central authority and involve no money.

2) Global values assigned and managed by a central authority like IEEE or GSMA. This usually involves money.

1) is flexible in that it allows creation of the value by hashing together enough random bits from sources ready-to-hand (which Thomas points out, PSA is using).

We can add other global registries if needed (and they truly are global).

LL


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