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Relaxed Two-to-One Recoding Schemes

  • Omkant Pandey
  • Kim Ramchen
  • Brent Waters
Part of the Lecture Notes in Computer Science book series (LNCS, volume 8642)

Abstract

A two-to-one recoding (TOR) scheme is a new cryptographic primitive, proposed in the recent work of Gorbunov, Vaikuntanathan, and Wee (GVW), as a means to construct attribute-based encryption (ABE) schemes for all boolean circuits. GVW show that TOR schemes can be constructed assuming the hardness of the learning-with-errors (LWE) problem.

We propose a slightly weaker variant of TOR schemes called correlation-relaxed two-to-one recoding (CR-TOR). Unlike the TOR schemes, our weaker variant does not require an encoding function to be pseudorandom on correlated inputs. We instead replace it with an indistinguishability property that states a ciphertext is hard to decrypt without access to a certain encoding. The primary benefit of this relaxation is that it allows the construction of ABE for circuits using the TOR paradigm from a broader class of cryptographic assumptions.

We show how to construct a CR-TOR scheme from the noisy cryptographic multilinear maps of Garg, Gentry, and Halevi as well as those of Coron, Lepoint, and Tibouchi. Our framework leads to an instantiation of ABE for circuits that is conceptually different from the existing constructions.

Keywords

Output Wire Input Wire Polynomial Time Adversary Recoding Scheme Functional Encryption 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer International Publishing Switzerland 2014

Authors and Affiliations

  • Omkant Pandey
    • 1
  • Kim Ramchen
    • 2
  • Brent Waters
    • 2
  1. 1.University of IllinoisUrbana-ChampaignUSA
  2. 2.University of TexasAustinUSA

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