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Secure Cloud Storage meets with Secure Network Coding

Secure Cloud Storage meets with Secure Network Coding. Fei Chen (Chinese University of Hong Kong, Hong Kong) Tao Xiang (Chongqing University, China) Yuanyuan Yang (Stony Brook University, USA) Sherman S. M. Chow (Chinese University of Hong Kong, Hong Kong). Roadmap. Preliminaries

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Secure Cloud Storage meets with Secure Network Coding

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  1. Secure Cloud Storagemeets withSecure Network Coding Fei Chen (Chinese University of Hong Kong, Hong Kong) Tao Xiang (Chongqing University, China) Yuanyuan Yang (Stony Brook University, USA) Sherman S. M. Chow (Chinese University of Hong Kong, Hong Kong)

  2. Roadmap • Preliminaries • Generic Construction • Technical Obstacles • Showcase: A Novel Protocol • Extensions • Third-party Auditing • User Anonymity • Summary

  3. Secure Cloud Storage (SCS) • Juels-Kaliski, Atenieseet al.(both CCS’07) • Wang, Chow, Wang, Ren, Lou (IEEE TC’13) • Yang-Jia (TPDS’13) • Wang, Chow, Li, Li (ICDCS’13)

  4. SCS Protocol User Cloud

  5. Handling Security

  6. User Cloud

  7. Security Definition

  8. Secure Network Coding (SNC) • Ahlswede, Cai, Li, Yeung from CUHK (IEEE TIT’00) • Li, Yeung, Cai (IEEE TIT’03); Cai-Yeung (ISIT’02) • Gkantsidis-Rodriguez (INFOCOM’06); Li, Lui, Chiu (ICNP’06) • Agrawal-Boneh (ACNS’09); Catalano et al. (PKC’12) • (many others)

  9. SNC Protocol

  10. Security Definition

  11. Our work

  12. 1. Generic Construction

  13. Basic Idea

  14. Optimization

  15. Security

  16. Data Recovery Algorithm

  17. 2. A Novel SCS Protocol • Based on a recent SNC protocol by Catalano et al. (PKC’12) • First publicly verifiable secure cloud storage protocol which is provably secure (not random oracle heuristics)

  18. Detailed Construction

  19. Theoretical Performance • Asymptotic performance comparable to previous work

  20. Experimental Performance • Benchmark (data from Wikipedia) • Storage and communication overhead

  21. Computation Cost • (Time is in milliseconds.) • The protocol is effective in practice. • Efficiency cost is acceptable for a standard model proof. • For protocols with security argued with random oracle heuristics, one may instantiate with larger cryptographic groups / security parameters, which results in lower efficiency anyways.

  22. Supporting Third-Party Auditing • Idea: mask the returned result with randomized vectors with coefficients all 0 (zero-knowledge proof of knowledge) • [Wang, Chow, Wang, Ren, Lou (IEEE TC’13)]

  23. Supporting User Anonymity • Idea: randomization again (blind signature approach) • [Wang, Chow, Li, Li (ICDCS’13)]

  24. Summary • Secure Cloud Storage meets with Secure Network Coding • A generic construction • A novel SCS protocol • Security definition and security proof • Support of third-party auditing and user anonymity

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