Abstract: A mobile App using biometric encryption and decryption for privacy and security having both authentication and recognition functions. It utilizes the built-in camera of the mobile device to provide facial images for authentication purposes. It further includes a secured data communication system for conveniently sending and receiving data on the mobile devices. The secured data communication system also utilizes biometric encryption and decryption technology for granting permissions to access the data communication system. The biometric encryption is implemented by using a selective biometric feature and optimized biometric feature detection and tracking methods. Different biometric feature authentication methods are optimized for use on various mobile platforms, such as, Android, iOS, Windows and others. Data encryption and decryption are achieved by using selected biometric feature vectors as cryptographic keys.