A Note on HEMA
Wang Li · Chinese Journal of Computers · 2004
In a recent paper, a hybrid encryption model for authentication(HEMA) was proposed, and the authors declare that HEMA encompasses all the virtues of typical models of authentication and is able to be applied in many sorts of open network systems such as mobile agents and multi-agents systems. In this paper, we point out some defects of HEMA. We show there are some redundancies and concurrent run-time errors in the protocol and indicate that to store and transfer the public key, which is desired to be transferred in open channels, by the trusted party secretly is a substantial error. Furthermore, we discuss the efficiency of the protocol by comparing it with some relative protocols.