Composability in quantum cryptography

Details Composability in quantum cryptography Composability in quantum cryptography

2010-06-11

arxiv.org/abs/1006.2215v1

New Journal of Physics, 11, 085006, 2009 (Focus on Quantum Cryptography: Theory and Practice)

Physics

Quantum Physics

18 pages, 2 figures

Scientific paper

10.1088/1367-2630/11/8/085006

In this article, we review several aspects of composability in the context of quantum cryptography. The first part is devoted to key distribution. We discuss the security criteria that a quantum key distribution protocol must fulfill to allow its safe use within a larger security application (e.g., for secure message transmission). To illustrate the practical use of composability, we show how to generate a continuous key stream by sequentially composing rounds of a quantum key distribution protocol. In a second part, we take a more general point of view, which is necessary for the study of cryptographic situations involving, for example, mutually distrustful parties. We explain the universal composability framework and state the composition theorem which guarantees that secure protocols can securely be composed to larger applications

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