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:
Sep. 09, 2014
Filed:
Mar. 30, 2012
Thomas Roeder, Redmond, WA (US);
Mihaela Ion, Trento, IT;
Thomas Roeder, Redmond, WA (US);
Mihaela Ion, Trento, IT;
Microsoft Corporation, Redmond, WA (US);
Abstract
Techniques enable range-based queries in searchable symmetric encryption (SSE) systems. A server device includes or provides access to a database that stores encrypted documents along with an encrypted index that maps bucketized terms (e.g., a term coupled with a value range associated with that term) to encrypted documents. Search is performed through a two-step process in which the client first sends a first search token to request the bucketization for a term, then sends one or more second search tokens each specifying a particular bucket in which to search for the term. In response to the second tokens, the server sends information corresponding to encrypted documents that satisfy the search. Embodiments further provide for incremental addition and deletion of particular values for a term, and rebucketization at the client when a rate of false positive search results exceeds a threshold.