Constrained Pseudorandom Functions and Their Applications

@article{Boneh2013ConstrainedPF,
  title={Constrained Pseudorandom Functions and Their Applications},
  author={Dan Boneh and Brent Waters},
  journal={IACR Cryptology ePrint Archive},
  year={2013},
  volume={2013},
  pages={352}
}
We put forward a new notion of pseudorandom functions (PRFs) we call constrained PRFs. In a standard PRF there is a master key k that enables one to evaluate the function at all points in the domain of the function. In a constrained PRF it is possible to derive constrained keys ks from the master key k. A constrained key ks enables the evaluation of the PRF at a certain subset S of the domain and nowhere else. We present a formal framework for this concept and show that constrained PRFs can be… CONTINUE READING
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