A Quantum-Proof Non-malleable Extractor

With Application to Privacy Amplification Against Active Quantum Adversaries
  • Divesh AggarwalEmail author
  • Kai-Min Chung
  • Han-Hsuan LinEmail author
  • Thomas Vidick
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 11477)


In privacy amplification, two mutually trusted parties aim to amplify the secrecy of an initial shared secret X in order to establish a shared private key K by exchanging messages over an insecure communication channel. If the channel is authenticated the task can be solved in a single round of communication using a strong randomness extractor; choosing a quantum-proof extractor allows one to establish security against quantum adversaries.

In the case that the channel is not authenticated, this simple solution is no longer secure. Nevertheless, Dodis and Wichs (STOC’09) showed that the problem can be solved in two rounds of communication using a non-malleable extractor, a stronger pseudo-random construction than a strong extractor.

We give the first construction of a non-malleable extractor that is secure against quantum adversaries. The extractor is based on a construction by Li (FOCS’12), and is able to extract from source of min-entropy rates larger than 1 / 2. Combining this construction with a quantum-proof variant of the reduction of Dodis and Wichs, due to Cohen and Vidick (unpublished) we obtain the first privacy amplification protocol secure against active quantum adversaries.


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Copyright information

© International Association for Cryptologic Research 2019

Authors and Affiliations

  1. 1.Center of Quantum Technologies, and Department of Computer ScienceNUSSingaporeSingapore
  2. 2.Institute of Information ScienceAcademia SinicaTaipeiTaiwan
  3. 3.Department of Computer ScienceThe University of Texas at AustinAustinUSA
  4. 4.Department of Computing and Mathematical SciencesCalifornia Institute of TechnologyPasadenaUSA

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