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Universally composable privacy amplification against quantum adversaries

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arxiv quant-ph/0403133 v2 pith:GWBWAPZV submitted 2004-03-18 quant-ph

classification quant-ph
keywords quantumcomposableuniversallyadversaryamplificationprivacysecretstring
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Privacy amplification is the art of shrinking a partially secret string Z to a highly secret key S. We show that, even if an adversary holds quantum information about the initial string Z, the key S obtained by two-universal hashing is secure, according to a universally composable security definition. Additionally, we give an asymptotically optimal lower bound on the length of the extractable key S in terms of the adversary's (quantum) knowledge about Z. Our result has applications in quantum cryptography. In particular, it implies that many of the known quantum key distribution protocols are universally composable.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. On estimating operator norm distance, with optimal trace distance estimation when one state is pure

    quant-ph 2026-07 accept novelty 7.0 of 10

    Rank-independent quantum estimators achieve Θ(1/ε) queries for operator-norm (and trace) distance when one state is pure, and Õ(1/ε^{3/2}) queries for general states, proving BQP-completeness.

  2. On estimating Schatten norm and power distances between quantum states

    quant-ph 2025-05 conditional novelty 7.0 of 10

    For constant alpha > 1, the quantum Schatten alpha-norm distance between states given by preparation circuits can be estimated in polynomial time, and the corresponding decision problem QSD_alpha is BQP-complete; for ...

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