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Conference Papers Year : 2012

Security Limitations of Using Secret Sharing for Data Outsourcing

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Jonathan L. Dautrich
  • Function : Author
  • PersonId : 1010027
Chinya V. Ravishankar
  • Function : Author
  • PersonId : 1010028

Abstract

Three recently proposed schemes use secret sharing to support privacy-preserving data outsourcing. Each secret in the database is split into n shares, which are distributed to independent data servers. A trusted client can use any k shares to reconstruct the secret. These schemes claim to offer security even when k or more servers collude, as long as certain information such as the finite field prime is known only to the client. We present a concrete attack that refutes this claim by demonstrating that security is lost in all three schemes when k or more servers collude. Our attack runs on commodity hardware and recovers a 8192-bit prime and all secret values in less than an hour for k = 8.
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Dates and versions

hal-01534766 , version 1 (08-06-2017)

Licence

Attribution - CC BY 4.0

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Jonathan L. Dautrich, Chinya V. Ravishankar. Security Limitations of Using Secret Sharing for Data Outsourcing. 26th Conference on Data and Applications Security and Privacy (DBSec), Jul 2012, Paris, France. pp.145-160, ⟨10.1007/978-3-642-31540-4_12⟩. ⟨hal-01534766⟩
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