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The MANET wireless network operates independently of any infrastructure and can establish connections dynamically, making it highly accessible regardless of the environment. However, the network is vulnerable to attacks such as the BHA, which can cause the depletion of the network. This attack introduces MNs into the network, providing false routing information to the source node. This leads to the drop of data packets and ultimately damages the network. To address this issue, we propose a node credibility-based approach that utilizes Andrew's plot to assess node credibility after several transactions. This method enables us to identify highly credible nodes which can be considered trustworthy in the network. We utilized Network Simulator software to create various MANET scenarios and test the effectiveness of our proposed approach against the BHA.