基于Hash函数的动态密钥分存技术的改进

Improved algorithm of dynamic secret sharing schemes based on Hash function

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.

This paper pointed out the weak points of the references[1] and [2]and proposed a cheat-proof dynamic secret sharing scheme based on hash function. The dealer can renew system secrets without renewing the shadows of the participants. When some participants＇ shadows are revealed, they can be renewed without any effect on the others. Also a new shadow can be generated for a new participant without any effect on the others. The shadows can be reused for many times. The scheme offered an efficient protection against cheating among participants as well.