指出文献[1,2]的不足,进而给出基于单向Hash函数的动态密钥分存方案的改进算法,使系统在更新系统密钥时,无须更改每个成员的子密钥;而当某个成员的子密钥泄密时,系统只需为该成员重新分配子密钥而不必更改其他成员的子密钥;当有新成员加入时,系统只需为新成员分配一个子密钥,而其他成员不受任何影响;子密钥可无限制地多次使用;具有很好的防欺诈性. The deficiencies of [1, 2] are pointed out, then an improved algorithm of dynamic key share scheme based on one-way Hash function is given, which makes the system not need to change the sub-key of each member when updating the system key. When a member’s sub-key is compromised, the system only needs to re-assign the sub-key to the member without changing the sub-keys of other members. When a new member joins, the system only needs to assign a sub-key to the new member, While the other members are not affected by any; sub-key unlimited use for many times; has good anti-fraud.