Abstract
Lin [1] proposed a dynamic key management scheme suitable for hierarchical control systems and that appeared in Computer Communications. It is useful in solving the key management problem for a privileged hierarchy using related parameters. However, the related parameters are generated by modulo exponential computation. This seems not efficient enough for a system with frequently changing requirements. Besides, Lee and Hwang proposed two comments to this scheme [2]. To eliminate the possible drawbacks as discussed in their comments, Cho [3] proposed modifying the scheme by adding a parameter. Although Cho’s scheme is an improvement in security, it is not as efficient as Lin’s scheme. In this paper. we propose a novel scheme. based on the elliptic curves that eliminates the drawbacks and has better performance.
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