Patents Assigned to Assa Abby AB
  • Key and lock device
    Patent number: 7099474
    Abstract: A key and lock device comprises a key having a first electronic circuit and a lock having a second electronic circuit. The key and the lock store secret information, some of which is unique for each device. The key and the lock exchange a random number through connectors and perform a calculation in the respective circuitry based on the random number and secret information. An electrical blocking mechanism is moved to a non-blocking position if a comparison of the calculations in the circuits gives the correct result.
    Type: Grant
    Filed: May 5, 2000
    Date of Patent: August 29, 2006
    Assignee: Assa Abby AB
    Inventors: Inge Lidén, Rolf Norberg, Björn Magnusson, Johan Warnström, Reijo Hakkarainen, Hannu Sivonen, Gudrun Brennecke, Christophe Chanel, Jens Gürtler, Jürgen Krühn, Alain Varenne, J M Thomas, Lance Schoell, Gilbert Andre, Christian Darmanin, Arnaud Lefebvre, Walter Hammer, Claude-Eric Jaquet, Nicolas Peguiron