Patents by Inventor Debapratim De

Debapratim De 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).

  • Patent number: 9684710
    Abstract: A method and system for cryptographically indexing, searching for, and retrieving documents is provided. In some embodiments, an encryption system is provided that generates a document index that allows users to retrieve documents by performing encrypted queries for keywords associated with the documents. In some embodiments, each keyword maps to the same number of encrypted document identifiers. In some embodiments, an extractor graph is employed to map an indication of each keyword to a number of buckets storing encrypted document identifiers. In some embodiments, an order-preserving encryption system is provided. The encryption system uses an ordered index that maps encrypted instances of ordered attribute values to documents that are associated with those values. The ordered index enables queries containing query operators that rely on order, such as less than (“<”) or greater than (“>”), to be successfully performed on encrypted attribute values.
    Type: Grant
    Filed: May 28, 2009
    Date of Patent: June 20, 2017
    Assignee: Microsoft Technology Licensing, LLC
    Inventors: Satyanarayana V. Lokam, Ajay Manchepalli, Balasubramanyan Ashok, Debapratim De, Sandeep P. Karanth
  • Publication number: 20100306221
    Abstract: A method and system for cryptographically indexing, searching for, and retrieving documents is provided. In some embodiments, an encryption system is provided that generates a document index that allows users to retrieve documents by performing encrypted queries for keywords associated with the documents. In some embodiments, each keyword maps to the same number of encrypted document identifiers. In some embodiments, an extractor graph is employed to map an indication of each keyword to a number of buckets storing encrypted document identifiers. In some embodiments, an order-preserving encryption system is provided. The encryption system uses an ordered index that maps encrypted instances of ordered attribute values to documents that are associated with those values. The ordered index enables queries containing query operators that rely on order, such as less than (“<”) or greater than (“>”), to be successfully performed on encrypted attribute values.
    Type: Application
    Filed: May 28, 2009
    Publication date: December 2, 2010
    Applicant: Microsoft Corporation
    Inventors: Satyanarayana V. Lokam, Ajay Manchepalli, Balasubramanyan Ashok, Debapratim De, Sandeep P. Karanth