1. A portable device for identification of an individual based on a vein-pattern comprising: a smartphone; a camera built in the smartphone, the camera acquiring an input image of a skin area with the vein-pattern of the individual, the input image is acquired in the near infrared (NIR) spectrum of light radiation; a built-in smartphone central processor unit (CPU) performs processing of the acquired input image to extract an input vein-pattern image from the obtained image of the skin area; the CPU performs deduction of points of interest from the vein-pattern image and calculation of their coordinates; the CPU also creates a 64-dimensional descriptor vector for each of the point of interest, the 64-dimensional descriptor vector including information about features of a local image around the each respective point of interest; the CPU compares the obtained image descriptor vector with each descriptor vector from a database of descriptor vectors; the database is stored in the smartphone; the CPU uses a criterion of minimum Euclidian distance between descriptor vectors and a criterion of sufficient separation between minimum Euclidian distances to establish pairs of matching points of interest for two images: the input image and each image stored in the database, and assuring the individual identification if the number of pairs of matched points of interest is greater than a predefined threshold.