将Shamir(k,n)-门限体制逆用,笔者构造了一类新的动态门限体制。该体制结构简单,易于实现。而且在系统更新时、删减成员时,仅需更新一些公开信息,因此效率更高。另外该方案可以有效的阻止来自系统内部和外部的攻击,因此提高了系统的实用性。同时该体制能够由每个成员自主选择子密钥,所以在应用上更加灵活方便。 By reversing the Shamir (k, n) -threshold system, the author constructs a new type of dynamic threshold system. The system structure is simple and easy to implement. And in the system update, delete members, only need to update some of the public information, so more efficient. In addition the program can effectively prevent attacks from inside and outside the system, thus improving the system’s practicality. At the same time, the system can choose the sub-key independently by each member, so the application is more flexible and convenient.