Biometric Solution

Term biometrics refers to technologies that measure and analyses human physiological or behavioral characteristics for authentication or identification purposes. Many different aspects of human physiology, chemistry or behavior can be used for authentication. Few of the most widely used characteristics or biometric factors are

       Fingerprint recognition
      Iris recognition
      Face recognition
      Voice recognition
      Hand geometry recognition
      Retina recognition

The main reasons to go for biometrics are to increase security while decreasing the burden of keeping keys, remembering passwords, etc