Several systems have been developed to perform an online signature acquisition. Most of them are based on video camera systems,5 or digital tablets (tablet personal computers, personal digital assistants, etc.)6 Although they guarantee satisfactory results, the systems that use one or two cameras for the dynamic capture of the signature are sensitive to variations of lighting (shade produced by the movements of the hand), and cannot be easily adapted to real-world systems (such as control access systems). Moreover, systems using digital tablets seem more practical than those based on cameras; however, they are relatively more expensive and require more dedicated material for the exploitation of acquired data. Other types of acquisition systems based on a data glove (conceived initially for virtual reality) have also been developed for the same purpose.7 The latter are powerful, but very constraining and not suitable for a general public use.