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A palm vein scanner is a biometric scanner or device which works on the palm vein pattern recognition or authentication technology. A palm vein authentication works by comparing the pattern of veins in the palm (which appear as blue lines) of a person being authenticated with a pattern stored in a database. As vascular patterns are unique to each individual and exist inside the body, it is not possible to steal these patterns, making palm vein authentication scanners the most secure of all biometric identification methods. Finger vein pattern recognition is based on the same principle as palm vein pattern recognition.