Fingerprint processing involves two processes: the fingerprint enrollment process and the fingerprint matching process (comparing fingerprints is divided into two methods: comparing fingerprints (1: 1) and searching of fingerprints (1: N)]. When the fingerprint is registered, entered twice for each fingerprint and processed, the composite model is stored in the module. The comparison of fingerprints, via the fingerprint sensor fingerprint, allows to capture the fingerprint image and its processing, then to make a corresponding comparison with the fingerprint model of the module (if it corresponds, a model specified in the module, called fingerprint matching , is 1: 1 mode. If it corresponds to several models, it is called fingerprint search mode (1: N mode). The module gives the result of the match spondance (pass or fail).