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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

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)

roadmap
Roadmap
  • Preliminaries
  • Generic Construction
    • Technical Obstacles
  • Showcase: A Novel Protocol
  • Extensions
    • Third-party Auditing
    • User Anonymity
  • Summary
secure cloud storage scs
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)
scs protocol
SCS Protocol

User

Cloud

slide6

User

Cloud

secure network coding snc
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)
2 a novel scs protocol
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)
theoretical performance
Theoretical Performance
  • Asymptotic performance comparable to previous work
experimental performance
Experimental Performance
  • Benchmark (data from Wikipedia)
  • Storage and communication overhead
computation cost
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.
supporting third party auditing
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)]
supporting user anonymity
Supporting User Anonymity
  • Idea: randomization again (blind signature approach)
  • [Wang, Chow, Li, Li (ICDCS’13)]
summary
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