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:
Nov. 23, 1999
Filed:
Dec. 09, 1996
Applicant:
Inventors:
Jelle Wissenburgh, The Hague, NL;
Johannes Brehler, Leidschendam, NL;
Frank Muller, Delft, NL;
Martin Klass De Lange, Voorburg, NL;
Hendricus Johannes Van de Pavert, Veenendaal, NL;
Albertus Feiken, Amstelveen, NL;
Assignee:
Koninklijke KPN N.V., Groningen, NL;
Primary Examiner:
Int. Cl.
CPC ...
H04L / ;
U.S. Cl.
CPC ...
380 24 ; 380 23 ; 380 25 ; 235379 ; 235380 ; 705 16 ; 705 17 ; 705 35 ; 705 39 ; 705 41 ;
Abstract
The invention relates to a method for protected transactions involving a so-called smart card and a terminal, such as a cash register. In order to prevent the smart card from simultaneously carrying out transactions with several terminals, the invention provides an authentication value which is used in the data exchange between the smart card and the terminal to uniquely identify subsequent steps of the transaction.