The bounded-storage model in the presence of a quantum adversary

Robert T. Konig, Barbara M. Terhal

Research output: Contribution to journalArticlepeer-review

43 Scopus citations


An extractor is a function Ε that is used to extract randomness. Given an imperfect random source Χ and a uniform seed Y, the output Ε(X,Y) is close to uniform. We study properties of such functions in the presence of prior quantum information about X, with a particular focus on cryptographic applications. We prove that certain extractors are suitable for key expansion in the bounded-storage model where the adversary has a limited amount of quantum memory. For extractors with one-bit output we show that the extracted bit is essentially equally secure as in the case where the adversary has classical resources. We prove the security of certain constructions that output multiple bits in the bounded-storage model.

Original languageEnglish
Pages (from-to)749-762
Number of pages14
JournalIEEE Transactions on Information Theory
Issue number2
StatePublished - Feb 2008
Externally publishedYes


  • Bounded-storage model
  • Cryptography
  • Extractors
  • Locking
  • Privacy amplification
  • Quantum information theory
  • Quantum key distribution
  • Quantum memory
  • Security proofs
  • Universal composability


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