1. A method for biometric authentication of a user comprising the steps of: a) providing: a mobile device comprising a camera and a screen; a database; and a randomly-generated image that is unique to each user using the mobile device; b) capturing with the camera an image of a fingerprint of the user; c) extracting first significant geographical areas of the fingerprint image; d) extracting second significant geographical areas of the randomly-generated image; e) concatenating the first significant geographical areas with the second significant geographical areas to produce a concatenated string; f) comparing the concatenated string with an authenticated concatenated string that is stored in the database; and g) returning a positive result if the compared strings match.