25 August 2005 Quantum stream cipher part III: design of keyed randomization and experiment
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In this talk, we present a design of keyed randomization, and an experiment for quantum stream cipher by Yuen protocol which can realize a randomized stream cipher with Gbps for long distance. A simple explanation of why Y-00 is more secure than any type of the conventional stream cipher is given, showing Y-00 with keyed randomization, for example, overlapping selection keying:OSK. That is, the noiseless Y-00 with OSK is equivalent of the conventional stream cipher, but the noise is inevitable. So one can easily see that the security is enhanced by the noise. In addition, we give a design for the implementation of the intensity modulation scheme and report the experimental demonstration of 1 Gbps quantum stream cipher with OSK randomization through 20~40 km long transmission line. This may provide a way to go toward the broad market applications which require security, high speed, compact size, maintenance free, and low price.
© (2005) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Osamu Hirota, Osamu Hirota, Tsuyoshi S. Usuda, Tsuyoshi S. Usuda, Masaru Fuse, Masaru Fuse, } "Quantum stream cipher part III: design of keyed randomization and experiment", Proc. SPIE 5893, Quantum Communications and Quantum Imaging III, 589304 (25 August 2005); doi: 10.1117/12.613080; https://doi.org/10.1117/12.613080


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