Key Derivation Without Entropy Waste

  title={Key Derivation Without Entropy Waste},
  author={Yevgeniy Dodis and Krzysztof Pietrzak and Daniel Wichs},
  booktitle={IACR Cryptology ePrint Archive},
We revisit the classical problem of converting an imperfect source of randomness into a usable cryptographic key. Assume that we have some cryptographic application P that expects a uniformly random m-bit key R and ensures that the best attack (in some complexity class) against P (R) has success probability at most δ. Our goal is to design a key-derivation function (KDF) h that converts any random source X of min-entropy k into a sufficiently “good” key h(X), guaranteeing that P (h(X)) has… CONTINUE READING
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