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[liberationtech] iPhone5S Fingerprint and 5th amendment

Eugen Leitl eugen at leitl.org
Wed Sep 11 09:08:22 PDT 2013


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.


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