Re: Fingerprint as cryptokey

Francois Grieu <fgrieu@xxxxxxxxxxxx> wrote:
I'm trying to find an information-theoretic argument that
there can't be a Biometrics -> Cryptokey function, not using
a database CONSTRUCTED FROM enrolled person's inputs, that
- generates the same output from two inputs acquired from
the same person with sizable probability (say > 2^-10)
- but still is very unlikely to produce the same outputs
from two inputs acquired from any two different persons
(say 2^-100).

Any clue ?

I don't see how there can be such an argument. If we ignore issues of
practicability and twins, what about DNA sequencing? I would guess there
is enough variability in DNA to ensure perfect matches, even if you have
to add some huge error-correcting code to compensate for the inevitable
errors. Pass the error-corrected sequence through a suitable hash function
and you have your cryptokey with no database involved, right?

Or did I not understand?

(PS. Such a scheme would be daft without some secret involved. DNA
sequences are hardly likely to be secure from a determined adversary.)

--
Kristian Gjøsteen
.

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