可用于公开信道的密钥共享方案

Secret Sharing Schemes Applicable for Public Channel

该文首先指出现有的门限密钥共享方案都不能用于公开信道,然后给出了两个可用于公开信道的密钥共享方案SS-1和SS-2。利用方案SS-1中给出的方法,几乎所有的门限密钥共享方案都可以得到改进,并且不影响原方案所具有的特性。方案SS-2解决了两个敌对团体间共享密钥的问题,其优点是不需要中间人,其安全性主要基于离散对数问题。

Firstly,we show that the previous secret sharing schemes are not applicable for public channel.Next,two secret sharing schemes,SS-1 and SS-2,applicable for public channel are presented.Almost all the secret sharing schemes can be improved by using the method given in SS-1.SS-2 can be used in two opposed delegations and its security is mainly based on the discrete logarithm problem.