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Proceedings Paper

Quantum stream cipher beyond the Shannon limit of symmetric key cipher and the possibility of experimental demonstration
Author(s): Osamu Hirota; Takehisa Iwakoshi; Masaki Sohma; Fumio Futami
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Paper Abstract

The security in the next generation optical network which realizes "Cloud Computing System Service with data center" is one of the most important problems. In such a network, the encryption in physical layer which provide super security and small delay is a preferable. It has to be applicable, however, to very high speed data because the basic link is operated at 2.5 Gbit/sec ~ 10 Gbit/sec. The quantum stream cipher by Yuen-2000 protocol (Y00) is a completely new type of random cipher, which can exceed the Shannon limit of the symmetric key cipher. This paper extends some theoretical results on the security for quantum stream cipher such as Y00 protocol and generalized Y00. First, the conditions to exceed the Shannon limit are summarized. We formulate a generalized secret capacity in the sense of wire tap channel supported by secret key to clarify a cipher exceeding the Shannon limit. The generalized secret capacities for space communication and fiber communication based on the generalized Y00 are given. When the relaxation of physical constraint or device limit of the eavesdropper is allowed, we point out that a cipher scheme exceeding the Shannon limit can be realized only by the conventional optical system.

Paper Details

Date Published: 30 August 2010
PDF: 11 pages
Proc. SPIE 7815, Quantum Communications and Quantum Imaging VIII, 78150P (30 August 2010); doi: 10.1117/12.860117
Show Author Affiliations
Osamu Hirota, Tamagawa Univ. (Japan)
Takehisa Iwakoshi, Tamagawa Univ. (Japan)
Masaki Sohma, Tamagawa Univ. (Japan)
Fumio Futami, Tamagawa Univ. (Japan)

Published in SPIE Proceedings Vol. 7815:
Quantum Communications and Quantum Imaging VIII
Ronald E. Meyers; Yanhua Shih; Keith S. Deacon, Editor(s)

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