Patents by Inventor MingKang Xu

MingKang Xu 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).

  • Method and apparatus for detecting data tampering within a database
    Patent number: 8190915
    Abstract: One embodiment of the present invention provides a system that facilitates detecting data tampering within a table in a database. The system operates by hashing a row in the table to create a row-hash. The system then hashes a block of consecutive row-hashes to create a block-hash. Finally, the system signs the block-hash with an encryption key, so that tampering with data in the row will result in an invalid row-hash and an invalid block-hash.
    Type: Grant
    Filed: June 14, 2006
    Date of Patent: May 29, 2012
    Assignee: Oracle International Corporation
    Inventors: Mingkang Xu, Daniel ManHung Wong
  • Method and apparatus for authorizing a database operation
    Patent number: 7770006
    Abstract: One embodiment of the present invention provides a system that authorizes a sensitive database operation. During operation, the system receives a request to perform a sensitive database operation. Note that, a sensitive database operation is an operation which, in the hands of a malicious user, poses a serious security threat. Next, the system determines a multiparty authorization requirement for the sensitive database operation, wherein the multiparty authorization requirement specifies a set of approvals required for authorizing the sensitive database operation. The system then sends approval requests to one or more approving parties based on the multiparty authorization requirement. Next, the system receives approvals for authorizing the sensitive database operation. The system then determines whether the approvals satisfy the multiparty authorization requirement.
    Type: Grant
    Filed: May 26, 2005
    Date of Patent: August 3, 2010
    Assignee: Oracle International Corporation
    Inventors: Daniel ManHung Wong, MingKang Xu, Paul Youn, MinHank Ho, Chon Hei Lei
  • Method and apparatus for detecting data tampering within a database
    Publication number: 20070294205
    Abstract: One embodiment of the present invention provides a system that facilitates detecting data tampering within a table in a database. The system operates by hashing a row in the table to create a row-hash. The system then hashes a block of consecutive row-hashes to create a block-hash. Finally, the system signs the block-hash with an encryption key, so that tampering with data in the row will result in an invalid row-hash and an invalid block-hash.
    Type: Application
    Filed: June 14, 2006
    Publication date: December 20, 2007
    Inventors: Mingkang Xu, Daniel ManHung Wong
  • Method and apparatus for authorizing a database operation
    Publication number: 20060271783
    Abstract: One embodiment of the present invention provides a system that authorizes a sensitive database operation. During operation, the system receives a request to perform a sensitive database operation. Note that, a sensitive database operation is an operation which, in the hands of a malicious user, poses a serious security threat. Next, the system determines a multiparty authorization requirement for the sensitive database operation, wherein the multiparty authorization requirement specifies a set of approvals required for authorizing the sensitive database operation. The system then sends approval requests to one or more approving parties based on the multiparty authorization requirement. Next, the system receives approvals for authorizing the sensitive database operation. The system then determines whether the approvals satisfy the multiparty authorization requirement.
    Type: Application
    Filed: May 26, 2005
    Publication date: November 30, 2006
    Inventors: Daniel Wong, MingKang Xu, Paul Youn, MinHank Ho, Chon Hei Lei