Cryptography Stack Exchange is a question and answer site for software developers, mathematicians and others interested in cryptography. It's 100% free, no registration required.

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I see in some “Authentication schemes with biometric” papers that those authors wrote a phase as password and biometric update phase.
My question is that why we may needs biometric update phase?
Is not biometric (say finger print or iris or face and …) permanent properties?

share|improve this question

closed as off-topic by archie, CodesInChaos, rath, Reid, hunter Nov 17 '13 at 21:41

  • This question does not appear to be about cryptography within the scope defined in the help center.
If this question can be reworded to fit the rules in the help center, please edit the question.

This question appears to be off-topic because it is about the mechanics of biometric authentication - it might be more appropriate for – archie Nov 17 '13 at 19:01
Please add links to the papers you mention. – rath Nov 17 '13 at 20:16

Some devices I've been working with do indeed update biometric information.

The reasons is that there may be additional information:

  • acceptable fingerprint was scanned (required features are found), but the scan shows some area of finger not involved in previous scans.
  • some other additional information helping make more exact scans in the future
share|improve this answer

Not the answer you're looking for? Browse other questions tagged or ask your own question.