Identity in the real world

There are lots of technologies making the rounds right now that pertain
to identity and identity management. A combination of factors are at
play here. On one hand, there is the security situation which has
breathed new impetus into the sector. On the other hand, there is B2B
e-commerce which, some would argue is "on hold" pending resolution of
the identity problem.

I have devoted more thinking time during working hours to this problem
over the last year than I would like. After all, I do not consider
myself to be a specialist in this area and security is a very
specialized subject. My mental travels have re-enforced a sneaking
suspicion that I have harbored for some time now. Namely, identity
management is not a technology problem. No, scratch that. It doesn't
sound right. Try this: if technology "solves" the identity problem then
the identity problem - as envisaged in e-business - is different from
the identity problem in normal business.

Let me explain. Various technologies are being put forward as ways to be
*absolutely* sure that someone is who they say they are. Biometrics,
retina scans you name it. The word "absolute" is the one that I find
most interesting here. After all, in the real world, we do not have any
way of telling that someone absolutely is who they say they are.

What we do have, are a number of time honored ways of reducing the
probability that someone is not who they say they are. Signatures, ID
cards, passwords, casual questioning, history of successful
transactions, referrals and the all important
stare-in-the-eye-and-wait-for-blink method.

None of these are absolute methods. They are all statistical in nature.
For any given transaction - from buying something with a credit card to
getting a passport, we use a combination of these imperfect methods. We
then subconsciously accumulate the probabilities. Given that I look like
the person on the ID card (say 80%), have a passable signature likeness
(say 70%) and can produce a utility bill with the right address (say
85%) - each of these probabilities is taken into account to yield a
final probability that I am who I say I am.

Given the fuzziness of the real world in this regard, isn't it odd that
we seem to be holding out for a perfect answer - an absolute method - in
the electronic world?

To make matters worse, in business to business e-commerce, people
(identities) do not act themselves. Machines talk to other machines and
present credentials on behalf of identities. This raises the highly
non-trivial question, what is the connection between the identity and
the machine? If I write a Cobol program to invoke one of your web
services on behalf of my employer, whose identity is presented to your
web service?

All B2B is effectively "action at a distance" as far as identity
management is concerned. We have a mechanism for handling this sort of
action in the real world.

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