Secret Key Establishment over a Pair of Independent Broadcast Channels

Details Secret Key Establishment over a Pair of Independent Broadcast Channels Secret Key Establishment over a Pair of Independent Broadcast Channels

2010-01-22

arxiv.org/abs/1001.3908v2

Computer Science

Information Theory

23 Pages, 4 figures, submitted to the 2010 International Symposium on Information Theory and its Applications (ISITA2010)

Scientific paper

This paper considers the problem of information-theoretic Secret Key Establishment (SKE) in the presence of a passive adversary, Eve, when Alice and Bob are connected by a pair of independent discrete memoryless broadcast channels in opposite directions. We refer to this setup as 2DMBC. We define the secret-key capacity in the 2DMBC setup and prove lower and upper bounds on this capacity. The lower bound is achieved by a two-round SKE protocol that uses a two-level coding construction. We show that the lower and the upper bounds coincide in the case of degraded DMBCs.

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