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A Digital Document Flexible Sanitizing Scheme

A Digital Document Flexible Sanitizing Scheme. Takanobu Masubuchi, Mitsuyuki Takatsuka, Ryoichi Sasaki Tokyo Denki University Proceedings of the 2006 International Conference on Intelligent Information Hiding and Multimedia Signal Processing Adviser: 鄭錦楸 , 郭文中 教授 Reporter: 林彥宏. Outline.

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A Digital Document Flexible Sanitizing Scheme

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  1. A Digital Document Flexible Sanitizing Scheme Takanobu Masubuchi, Mitsuyuki Takatsuka, Ryoichi Sasaki Tokyo Denki University Proceedings of the 2006 International Conference on Intelligent Information Hiding and Multimedia Signal Processing Adviser: 鄭錦楸 ,郭文中 教授 Reporter: 林彥宏

  2. Outline • Introduction • Conventional Schemes • Proposed Scheme • Conclusions

  3. Introduction • digital documents sanitizing problem • SUMI-4:cannot detect illegalsanitization by the sanitizer • Content Extraction Signatures(CES):sanitizer cannot change the sanitizing blocks, even if the disclosure policy has changed • can answer requests for flexible changes in the sanitized sections of a document

  4. Conventional Schemes

  5. Overview of SUMI-4 Sign: M Random number Hash

  6. Overview of SUMI-4 Sanitizing: H2 Random Number Hash • The sanitizer can freely sanitize every part of the document.

  7. Proposed Scheme: Digital Document Flexible Sanitizing Scheme Trusted Third Party

  8. Procedure for the Signer M Seed Hash

  9. Procedure for Sanitizer H1 H2 Seed Hash Flags

  10. Verification by Requester H1 H2 Hash Flags

  11. Procedure for changed request TTP H1 H2 Hash Flags

  12. Signature re-verification procedure H1 Hash Flags

  13. Comparison of DDFS with SUMI-4 and CES • DDFS can handle requests to flexible change the sanitized blocks in a document without compromising security • the seed for random numbers is storedwith the documents, the stored data size is smaller compared to both SUMI-4 and CES. • the seed is managed safely with the publickey of the sanitizer in DDFS

  14. Conclusions • They propose a digitally signeddocument flexible sanitizing scheme (DDFS) that cananswer requests for flexible changes in the sanitizedsections of a document without compromising security.

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