Patents by Inventor Minh Duy Tu

Minh Duy Tu has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Security key distribution using key rollover strategies for wireless networks
    Patent number: 7545942
    Abstract: Security key distribution techniques using key rollover strategies for wireless networks are described. A number of keys are generated, usually by an access point. The present invention allows a standard mode and a mixed mode. In standard mode, each device on the network supports automatic key updates. In mixed mode, one or more devices on the wireless network require fixed keys. In both modes, a predetermined number of keys are determined and communicated to client devices that are accessing the wireless network. The predetermined number is determined so that a client device can miss a certain number of authentication periods without losing communication with the wireless network. Preferably, transmit keys used by an access point are different than the transmit keys used by the client devices that support automatic key updates.
    Type: Grant
    Filed: April 13, 2007
    Date of Patent: June 9, 2009
    Assignee: Agere Systems Inc.
    Inventors: Douglas Michael Cohen, Christiaan Hartman, Ajit Kumar Jha, Minh Duy Tu
  • Security key distribution using key rollover strategies for wireless networks
    Patent number: 7221764
    Abstract: Security key distribution techniques using key rollover strategies for wireless networks are described. A number of keys are generated, usually by an access point. The present invention allows a standard mode and a mixed mode. In standard mode, each device on the network supports automatic key updates. In mixed mode, one or more devices on the wireless network require fixed keys. In both modes, a predetermined number of keys are determined and communicated to client devices that are accessing the wireless network. The predetermined number is determined so that a client device can miss a certain number of authentication periods without losing communication with the wireless network. Preferably, transmit keys used by an access point are different than the transmit keys used by the client devices that support automatic key updates.
    Type: Grant
    Filed: February 14, 2002
    Date of Patent: May 22, 2007
    Assignee: Agere Systems Inc.
    Inventors: Douglas Michael Cohen, Christiaan Hartman, Ajit Kumar Jha, Minh Duy Tu
  • Security key distribution using key rollover strategies for wireless networks
    Publication number: 20030152235
    Abstract: Security key distribution techniques using key rollover strategies for wireless networks are described. A number of keys are generated, usually by an access point. The present invention allows a standard mode and a mixed mode. In standard mode, each device on the network supports automatic key updates. In mixed mode, one or more devices on the wireless network require fixed keys. In both modes, a predetermined number of keys are determined and communicated to client devices that are accessing the wireless network. The predetermined number is determined so that a client device can miss a certain number of authentication periods without losing communication with the wireless network. Preferably, transmit keys used by an access point are different than the transmit keys used by the client devices that support automatic key updates.
    Type: Application
    Filed: February 14, 2002
    Publication date: August 14, 2003
    Inventors: Douglas Michael Cohen, Christiaan Hartman, Ajit Kumar Jha, Minh Duy Tu