The word biometrics has a Greek origin: “metron” meaning measure and “bio” meaning life. Complex and very expensive biometric systems have been used for the last decades in high security areas. There is a whole series of biometric techniques putting emphasis on the head (face, iris, retina, ear pattern, …), the body (finger scan, hand geometry, vein pattern, DNA, …) or behavioural characteristics (voice, signature, motion, keystroke patterns,…). Only few of them are both technically mature and ready for the mass market at reasonable prices. Biometric characteristics are registered through a scanner for data acquisition. Certain unique features are extracted, processed, converted into a binary code and then cryptographically secured in a data base from that moment onwards. Newly presented data is compared to previously saved master templates and access is granted only on positive authentication.