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Proofs or Retrievability

A Proof of Retrievability (PoR) is a cryptographic protocol which aims at ensuring a user that he can retrieve files he previously stored on a server. J. Lavauzelle and F. Levy-dit-Vehel studied a new approach for the construction of PoRs. The idea is to encode the file so that the user can check with low communication whether its file has been damaged. Such an encoding can be efficiently done with locally decodable and testable codes, and especially with the family of lifted codes introduced by Guo, Kopparty and Sudan  [30]. In practice, PoRs thus defined achieve very efficient storage overhead and acceptable communication, compared to the existing litterature. This new construction [15] has been presented during the ISIT2016 conference in Barcelona.