密码体制无条件安全性的新改进

The Unconditional Security of Cryptography and New Advancements

分析了一次一密体制和量子密码的安全性，提出了一次一密体制并非以前所认为的无条件安全，仍然存在不安全的可能。从完善保密的角度，针对一次一密体制的局限性提出新的密码分析方法——唯长度攻击。在量子密码方面，提出新的协议攻击方法，并从实用的角度提出设计配备相关的纠错编码和检验监听措施的量子加密改进协议。

The paper analyzed security of one-time system and makes the conclusion that it was not as secure as it was reckoned.It may be insecure under particular conditions.In order to perfect their security we brought forward a new cryptoanalysis method-only length attack aiming at the limitations of one-time system.At the same time,new means to attack protocols of quantum cryptography and the modified quantum encrypt protocol equipped with correcting codes and monitor measure are proposed.