A Model of Hierarchical Key Assignment Scheme with CRT

A model of the hierarchical key assignment scheme is established in this paper, which can be applied with any one-way function. With the scheme, the users in the system are divided into several groups according to their predecessors and have a parameter with the group. Applied with CRT, a user key is bounded with its ID in the scheme. By sharing a parameter within the group, the scheme will use less space for parameters. Also, the scheme model is able to meet the optimal dynamic control property. Together with the security, dynamic and complexity analysis of the scheme model, this paper also includes an application example of the model with the discrete logarithm.