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1 February 1998 Security of quantum cryptography against individual attacks
Boris A. Slutsky, Ramesh R. Rao, Pang Chen Sun, Yeshaiahu Fainman
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Proceedings Volume 3228, Multimedia Networks: Security, Displays, Terminals, and Gateways; (1998) https://doi.org/10.1117/12.300902
Event: Voice, Video, and Data Communications, 1997, Dallas, TX, United States
Abstract
An attempt to eavesdrop a quantum cryptographic channel reveals itself through errors it inevitably introduces into the transmission. We investigate the relationship between the induced error rate and the maximum amount of information the eavesdropper can extract, both in the two-state B92 and the four-state BB84 quantum cryptographic protocols. In each case, the optimal eavesdropping method that on average yields the most information for a given error rate is explicitly constructed. Analysis is limited to eavesdropping strategies where each bit of the quantum transmission is attacked individually and independently form other bits. Subject to this restriction, however, we believe that all attacks not forbidden by physical laws are included. Unlike previous work, the eavesdropper's advantage is measured in terms of Renyi information, and with respect only to bits received error-free by Bob. This alters both the maximum extractable information and the optimal eavesdropping attack. The result can be used directly at the privacy amplification stage of the protocol to accomplish secure communication over a noisy channel.
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Boris A. Slutsky, Ramesh R. Rao, Pang Chen Sun, and Yeshaiahu Fainman "Security of quantum cryptography against individual attacks", Proc. SPIE 3228, Multimedia Networks: Security, Displays, Terminals, and Gateways, (1 February 1998); https://doi.org/10.1117/12.300902
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KEYWORDS
Information security
Quantum cryptography
Quantum communications
Quantum information
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