【摘要】 本文给出一类新的完善保密协议———优先退化协议 ,它与以往的优先提取协议具有不同的功能 :优先提取是指通信伙伴的互信息被首先提取 ,而优先退化是指敌方掌握的信息被首先退化 .本文讨论了优先退化协议有效的条件 ,并给出了一个同时具有优先提取和优先退化功能的混合协议更多还原

【Abstract】 This paper presents a new class of complete security protocol--advantage degeneration protocol.Advantage degeneration protocol and former advantage distillation protocol have different functions:one means that the mutual information of communication partners is distilled firstly,another that the information of enemy is degenerated firstly.The paper discusses conditions for efficient protocol,and presents a mixed protocol which has both advantage distillation and advantage degeneration functions.更多还原