Abstract: A method quickly recognizes a person by identification codes derivable from biometric data and includes registering a user, and recognizing a registered user, out of multiple registered users, through a recognition event. Each registration event includes acquiring biometric data of the user; then, encoding the biometric data into a respective registration identification code associated with the user; and registering the user and the associated registration identification code. Each recognition event includes acquiring the biometric data; then, encoding the biometric data into a respective recognition identification. Based on said registered registration identification codes, a comparison set of comparison identification codes is prepared. The recognition identification code is compared with each comparison identification code; and for each comparison, a respective matching level is estimated. The user is recognized or refused recognition based on the estimated matching levels.