Hardness-Preserving Reductions via Cuckoo Hashing

  title={Hardness-Preserving Reductions via Cuckoo Hashing},
  author={Itay Berman and Iftach Haitner and Ilan Komargodski and Moni Naor},
  journal={Journal of Cryptology},
The focus of this work is hardness-preserving transformations of somewhat limited pseudorandom functions families (PRFs) into ones with more versatile characteristics. Consider the problem of domain extension of pseudorandom functions: given a PRF that takes as input elements of some domain $$\mathcal {U}$$ U , we would like to come up with a PRF over a larger domain. Can we do it with little work and without significantly impacting the security of the system? One approach is to first hash the… CONTINUE READING
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