BibTex format
@article{Jones:2008,
author = {Jones, NS and Masanes, L},
journal = {Information Theory, IEEE Transactions on},
pages = {680--691},
title = {Key Distillation and the Secret-Bit Fraction},
volume = {54},
year = {2008}
}
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Citation
RIS format (EndNote, RefMan)
TY - JOUR
AB - We consider distillation of secret bits from partially secret noisy correlations P<sub>ABE</sub>, shared between two honest parties and an eavesdropper. The most studied distillation scenario consists of joint operations on a large number of copies of the distribution (P<sub>ABE</sub>)<sup>N</sup>, assisted with public communication. Here we consider distillation with only one copy of the distribution, and instead of rates, the ¿quality¿ of the distilled secret bits is optimized, where the ¿quality¿ is quantified by the secret-bit fraction of the result. The secret-bit fraction of a binary distribution is the proportion which constitutes a secret bit between Alice and Bob. With local operations and public communication the maximal extractable secret-bit fraction from a distribution P<sub>ABE</sub> is found, and is denoted by ¿[P<sub>ABE</sub>]. This quantity is shown to be nonincreasing under local operations and public communication, and nondecreasing under eavesdropper's local operations: ¿ is a secrecy monotone. It is shown that if ¿ [P<sub>ABE</sub>] > 1/2 then P<sub>ABE</sub> is distillable, thus providing a sufficient condition for distillability. A simple expression for ¿[P<sub>ABE</sub>] is found when the eavesdropper is decoupled, and when the honest parties' information is binary and the local operations are reversible. Intriguingly, for general distributions the (optimal) operation requires local degradation of the data.
AU - Jones,NS
AU - Masanes,L
EP - 691
PY - 2008///
SN - 0018-9448
SP - 680
TI - Key Distillation and the Secret-Bit Fraction
T2 - Information Theory, IEEE Transactions on
VL - 54
ER -