The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 07, 1998
Filed:
Mar. 22, 1996
Yves Audebert, Croissy-sur-Seine, FR;
Activcard, Issy les Moulineaux Cedex, FR;
Abstract
The system includes a first card-like unit adapted to communicate with a second unit. The second unit grants conditional access to a function or service in accordance with an authentication operation. Both units are capable of running software for generating passwords by means of encryption of several dynamic variables as for example a time dependent variable and/or a variable representing the number of formulated authentication requests. The encryption may be performed using a dynamic key. In order to synchronize the values of the variables generated in concert but independently in the units, only some of the least significant digits of the variables are transferred from the card-like unit to the other unit, with the transfer being performed by adding the digits to the password. This synchronization information is combined with corresponding variables in the second unit and used to calculate therein a value which has to match with the password calculated in the second unit in order to gain access to the function or service.