Quantum stream cipher by the Yuen 2000 protocol: Design and experiment by an intensity-modulation scheme
Quantum stream cipher by the Yuen 2000 protocol: Design and experiment by an intensity-modulation scheme
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DOI：
10.1103/physreva.72.022335
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发表时间：
2005-08-01
影响因子：
2.9
通讯作者：
Kato, K
中科院分区：
文献类型：
--
作者：
Hirota, O;Sohma, M;Kato, K
我们研究了Yuen 2000（所谓的Y-00） - 协议，该协议可以实现长距离（数百公里）的高比特率（GBIT/s）的随机流密码。基于Y-00协议的量子噪声随机化的随机流密码称为本文中的量子流密码，它可能具有针对已知的明文攻击的安全性，该宣传攻击与任何常规的对称密钥密码没有类似物。我们基于攻击者的异差测量和量子明确的测量，提出了一项简单的密码分析，以清楚实际通信中Y-00协议的强度。此外，我们为实施强度调节方案提供了设计，并通过长20公里的传输线报告了1 GBIT/S量子流密码的实验证明。
We investigate the Yuen 2000 (so-called Y-00)-protocol, which can realize a randomized stream cipher with high bit rate (Gbit/s) for long distances (several hundreds km). The randomized stream cipher with randomization by quantum noise based on the Y-00 protocol is called a quantum stream cipher in this paper, and it may have security against known plaintext attacks which has no analog with any conventional symmetric key ciphers. We present a simple cryptanalysis based on an attacker's heterodyne measurement and a quantum unambiguous measurement to make clear the strength of the Y-00 protocol in real communication. In addition, we give a design for the implementation of an intensity-modulation scheme and report an experimental demonstration of 1 Gbit/s quantum stream cipher through a 20-km-long transmission line.