Yuen 2000协议对量子流密码相关攻击的免疫性
An immunity against correlation attack on quantum stream cipher by Yuen 2000 protocol
摘要：
本文对量子流密码Yuen-2000协议（或$αη$方案）对抗流密码典型攻击快速相关攻击的安全性进行了分析。虽然在信息论意义下，一个非常简单的不带随机映射器的量子流密码实验模型可以用快速相关算法进行解密，但这并不是Yuen 2000协议的基本特征。事实上，我们澄清，存在一个随机化方案，达到完美的相关免疫力对这种攻击下的近似。并且在该方案中，来自第二随机化的确定映射模式的运行密钥相关性也被量子噪声消除。在这种情况下，任何快速相关攻击对量子流密码都不起作用。
英文摘要：
This paper presents the security analysis on the quantum stream cipher so called Yuen-2000 protocol (or $αη$ scheme) against the fast correlation attack, the typical attack on stream ciphers. Although a very simple experimental model of the quantum stream cipher without a random mapper may be decrypted in the information theoretic sense by the fast correlation algorithm, it is not a basic feature of Yuen 2000 protocol. In fact, we clarify that there exists a randomization scheme which attains the perfect correlation immunity against such attacks under an approximation. And in this scheme, the running key correlation from the second randomization that determines the mapping patterns is dismissed also by quantum noise. In such a case, any fast correlation attack does not work on the quantum stream cipher.
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