Asymmetric content fingerprinting with adaptive window sizing
US8386792B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 10, 2008 |
| Grant date | Feb 26, 2013 |
| Priority date | — |
| Expiry date | Dec 28, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2209/60
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Processes for fingerprinting a document file and for preventing information leakage are disclosed. Computer apparatus for implementing said processes are also disclosed. For fingerprinting a document, the document is provided and may be normalized. A sequence of hash values are generated for the document. A window size is adaptively determined depending upon the document. Fingerprints for the document are selected from amongst the hash values using the adaptively-sized window. The fingerprints for the document are added to a fingerprint set for content being protected by the information leakage prevention system. For information leakage prevention, suspect documents are processed at the deployment points by extracting fingerprints from the suspect documents and matching the extracted fingerprints against the fingerprints in the fingerprint set. Different fingerprint extraction methods are used at the server and the deployment points. Other embodiments, aspects and features are also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.