The invention authorizes an individual's access to computer networks from a comparison of an individual's biometric sample gathered during a bid step with at least one biometric sample gathered during a registration step and stored at a host system data processing center. The invention comprises a host system data processing center with means for comparing the entered biometric sample, and is equipped with various databases and memory modules. Furthermore, the invention is provided with: at least one biometric input apparatus; at least one terminal to provide information for execution of the requested transactions and transmissions by the host system once the identity of the individual is determined; and at least one computer network to which the individual seeks access. The invention is also provided with means for connecting the host system with the terminal and the biometric input apparatus.