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Privacy preserving method for querying a remote public service

  • US 8,666,992 B2
  • Filed: 06/15/2012
  • Issued: 03/04/2014
  • Est. Priority Date: 06/15/2012
  • Status: Expired due to Fees
First Claim
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1. A method of querying a remote service without revealing a private document to the remote service, comprising:

  • at a main computer, receiving from a client a signature generated from a user'"'"'s private document, without receiving the document;

    querying an intermediate database with the signature of the private document to generate an intermediate result set comprising intermediate database documents, based on a computation of similarity of the signatures of the intermediate database documents to the signature of the private document;

    computing a relevance factor for each document of the intermediate result set;

    computing a reconstruction error based on the relevance factors of all the documents in the intermediate result set and determining a confidence in the intermediate result set based on the reconstruction error;

    querying the remote service with a query which is based on the intermediate result set, whereby the user'"'"'s private document and the signature of the private document are not revealed to the remote service;

    receiving a final result set from the remote service based on the query; and

    weighting the final result set based on the relevance factors.

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