Looks like fingerprints have 30-40ish bits of entropy depending on how forgiving the device is, so unless they're doing some key stretching it should be practic

Looks like fingerprints have 30-40ish bits of entropy depending on how forgiving the device is, so unless they're doing some key stretching it should be practical to produce an image of a similar fingerprint by brute-forcing the hash with every biologically likely fingerprint. http://lukenotricks.blogspot.com/2009/04/on-entropy-of-fingerprints.html http://lukenotricks.blogspot.com/2009/04/on-entropy-of-finge...