A method and apparatus are provided for improving the security of data transmissions between stations. The method obviates the need for transmitting user-identification information such as personal identification number (PIN) from station to station, e.g., from the station utilized by the user to enter...http://www.google.fr/patents/US4281215?utm_source=gb-gplus-shareBrevet US4281215 - Method and apparatus for securing data transmissions
Method and apparatus for securing data transmissions
