Edit: After half day, my wife’s Mac started having the same problem. I have then applied the solution that I found in the Apple
The Government Could Use An iPhone To Check Your Identity
California based company AOptix offer a biometric identification system based off the iPhone aimed at towards the government.
This complex application can be used to detect your face, iris, voice and fingerprints all from an iPhone. The system, that can be used by border agencies and health services consists of a specialist case for the iPhone 4/4S and an app for ?130 ($199). The app can be bought from the app store today in its first public release.
Questions were asked about the security of the product but the Director of Product Marketing Jeremy Pritikin reassuringly stated that it was a “very secure platform” and that they have a “very strong ecosystem for supporting accessories like the one [they] created”.