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MANET consists of wireless mobile nodes that could be self-configured. These nodes aren't supported by any established infrastructure. So it is commonly susceptible to various attacks. The relevant researches for MANETs currently focus on solving various security problems. In this article, we first briefly survey previous works regarding key management of MANETs, and then simply introduce the security scheme presented by Yuchen Zhang, Jing Liu, etc. We further present our scheme based on the security scheme's insufficiency in respect of each node's identity authentication and secure channel for MANETs. In the end, We evaluate the performance of the above scheme in detail.