Patents by Inventor Xinhua J. Zhao

Xinhua J. Zhao 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).

  • Bridged cryptographic VLAN
    Patent number: 8347377
    Abstract: The invention comprises three extensions of the IEEE 802.1Q VLAN bridge model. The first extension is the cryptographic separation of VLANs over trunk links. A LAN segment type referred to as an encapsulated LAN segment is introduced. All frames on such a segment are encapsulated according to an encryption and authentication code scheme. The second extension is the division of a trunk port into inbound and outbound ports. The third extension is a protocol that automatically infers for each outbound port in a bridged VLAN, a set of LAN segment types for the port that minimizes the number of transfers between encapsulated and unencapsulated segments required to transport a frame in the bridged VLAN.
    Type: Grant
    Filed: September 13, 2010
    Date of Patent: January 1, 2013
    Assignee: Microsoft Corporation
    Inventors: Dennis Michael Volpano, Xinhua J. Zhao
  • BRIDGED CRYPTOGRAPHIC VLAN
    Publication number: 20110033047
    Abstract: The invention comprises three extensions of the IEEE 802.1Q VLAN bridge model. The first extension is the cryptographic separation of VLANs over trunk links. A LAN segment type referred to as an encapsulated LAN segment is introduced. All frames on such a segment are encapsulated according to an encryption and authentication code scheme. The second extension is the division of a trunk port into inbound and outbound ports. The third extension is a protocol that automatically infers for each outbound port in a bridged VLAN, a set of LAN segment types for the port that minimizes the number of transfers between encapsulated and unencapsulated segments required to transport a frame in the bridged VLAN.
    Type: Application
    Filed: September 13, 2010
    Publication date: February 10, 2011
    Applicant: MICROSOFT CORPORATION
    Inventors: DENNIS MICHAEL VOLPANO, XINHUA J. ZHAO
  • Bridged cryptographic VLAN
    Patent number: 7818796
    Abstract: The invention comprises three extensions of the IEEE 802.1Q VLAN bridge model. The first extension is the cryptographic separation of VLANs over trunk links. A LAN segment type referred to as an encapsulated LAN segment is introduced. All frames on such a segment are encapsulated according to an encryption and authentication code scheme. The second extension is the division of a trunk port into inbound and outbound ports. The third extension is a protocol that automatically infers for each outbound port in a bridged VLAN, a set of LAN segment types for the port that minimizes the number of transfers between encapsulated and unencapsulated segments required to transport a frame in the bridged VLAN.
    Type: Grant
    Filed: February 10, 2006
    Date of Patent: October 19, 2010
    Assignee: Microsoft Corporation
    Inventors: Dennis Michael Volpano, Xinhua J. Zhao
  • Bridged cryptographic VLAN
    Patent number: 7703132
    Abstract: The invention comprises three extensions of the IEEE 802.1Q VLAN bridge model. The first extension is the cryptographic separation of VLANs over trunk links. A LAN segment type referred to as an encapsulated LAN segment is introduced. All frames on such a segment are encapsulated according to an encryption and authentication code scheme. The second extension is the division of a trunk port into inbound and outbound ports. The third extension is a protocol that automatically infers for each outbound port in a bridged VLAN, a set of LAN segment types for the port that minimizes the number of transfers between encapsulated and unencapsulated segments required to transport a frame in the bridged VLAN.
    Type: Grant
    Filed: August 20, 2007
    Date of Patent: April 20, 2010
    Assignee: Microsoft Corporation
    Inventors: Dennis M. Volpano, Xinhua J. Zhao
  • Bridged Cryptographic VLAN
    Publication number: 20080198863
    Abstract: The invention comprises three extensions of the IEEE 802.1Q VLAN bridge model. The first extension is the cryptographic separation of VLANs over trunk links. A LAN segment type referred to as an encapsulated LAN segment is introduced. All frames on such a segment are encapsulated according to an encryption and authentication code scheme. The second extension is the division of a trunk port into inbound and outbound ports. The third extension is a protocol that automatically infers for each outbound port in a bridged VLAN, a set of LAN segment types for the port that minimizes the number of transfers between encapsulated and unencapsulated segments required to transport a frame in the bridged VLAN.
    Type: Application
    Filed: August 20, 2007
    Publication date: August 21, 2008
    Applicant: Cranite Systems, Inc.
    Inventors: Dennis M. Volpano, Xinhua J. Zhao
  • Bridged cryptographic VLAN
    Patent number: 7120791
    Abstract: The invention comprises three extensions of the IEEE 802.1Q VLAN bridge model. The first extension is the cryptographic separation of VLANs over trunk links. A LAN segment type referred to as an encapsulated LAN segment is introduced. All frames on such a segment are encapsulated according to an encryption and authentication code scheme. The second extension is the division of a trunk port into inbound and outbound ports. The third extension is a protocol that automatically infers for each outbound port in a bridged VLAN, a set of LAN segment types for the port that minimizes the number of transfers between encapsulated and unencapsulated segments required to transport a frame in the bridged VLAN.
    Type: Grant
    Filed: November 1, 2002
    Date of Patent: October 10, 2006
    Assignee: Cranite Systems, Inc.
    Inventors: Dennis Michael Volpano, Xinhua J. Zhao
  • Bridged cryptographic VLAN
    Publication number: 20030145118
    Abstract: The invention comprises three extensions of the IEEE 802.1Q VLAN bridge model. The first extension is the cryptographic separation of VLANs over trunk links. A LAN segment type referred to as an encapsulated LAN segment is introduced. All frames on such a segment are encapsulated according to an encryption and authentication code scheme. The second extension is the division of a trunk port into inbound and outbound ports. The third extension is a protocol that automatically infers for each outbound port in a bridged VLAN, a set of LAN segment types for the port that minimizes the number of transfers between encapsulated and unencapsulated segments required to transport a frame in the bridged VLAN.
    Type: Application
    Filed: November 1, 2002
    Publication date: July 31, 2003
    Inventors: Dennis Michael Volpano, Xinhua J. Zhao