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:
Feb. 09, 2010
Filed:
Jul. 07, 2004
Tanmoy Dutta, Sammamish, WA (US);
Girish Chander, Redmond, WA (US);
Laurentiu Bogdan Cristofor, Redmond, WA (US);
Rodger N. Kline, Woodinville, WA (US);
James R. Hamilton, Bellevue, WA (US);
Tanmoy Dutta, Sammamish, WA (US);
Girish Chander, Redmond, WA (US);
Laurentiu Bogdan Cristofor, Redmond, WA (US);
Rodger N. Kline, Woodinville, WA (US);
James R. Hamilton, Bellevue, WA (US);
Microsoft Corporation, Redmond, WA (US);
Abstract
The systems and methods of the present invention facilitate database row-level security by utilizing SQL extensions to create and associate named security expressions with a query initiator(s). Such expressions include Boolean expressions, which must be satisfied by a row of data in order for that data to be made accessible to the query initiator. In general, a query is augmented with security expressions, which are aggregated and utilized during querying rows of data. The systems and methods variously place security expressions within a query in order to optimize query performance while mitigating information leaks. This is achieved by tagging security expressions as special and utilizing rules of predicate to pull or push non-security expressions above or below security expressions, depending on the likelihood of a non-security being safe, as determined via a static and/or dynamic analysis.