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讲述了密钥共享体制的基本概念和数学模型以及同态密钥共享体制，分析了理想存取结构和拟阵之间的对应关系，研究了完全密钥共享体制的最优信息率，讨论了在实际应用中非常重要的多密钥共享和密钥共享体制中的防欺骗问题．
The basic concepts and mathematical models of the key sharing system and the homomorphic key sharing system are introduced. The correspondence between the ideal access structure and the pseudo-matrix is analyzed. The optimal information rate of the complete key sharing system is discussed. In practical applications is very important multi-key sharing and key sharing system fraud.