[liberationtech] iPhone5S Fingerprint and 5th amendment

[Eugen Leitl]

On Wed, Sep 11, 2013 at 11:04:44AM -0500, Matt Mackall wrote:

> Similarly, any other sort of one-way algorithm that prevents you from
> reconstructing a valid input from the stored data is not going to work.

Typical fingerprint matching uses classification, recognizing and
encoding multiple features into a vector. You could use a one-way
hash on that vector. This is likely subject to a precompiled hash
lookup table attack, as the number of all possible fingerprints,
quantized via a classification vector is not that large.