In this paper, effective synchronization of a group of neural networks using a generative adversarial network is proposed for secured neural key exchange over public channels. Two artificial neural networks (ANNs) are synchronized by reciprocal training to exchange the key across a public network. The most important aspect of neural coordination is determining how well two parties' ANNs synchronize in the absence of weights from the other. Existing approaches have a delay in measuring coordination, which compromises the secrecy of neuronal coordination. Moreover, there is a scarcity of study into the reciprocal learning of a cluster of ANNs and the generation of a common input vector through robust PRNG. This study offers a mutual learning approach for rapidly and effectively assessing the complete synchronization of a group of ANNs. The frequency with which the two networks have had the same outcome in previous rounds is used to determine cooperation. When a particular threshold is reached, the hash is used to check if all networks are correctly coordinated. To accomplish full coordination between two communicating entities, the proposed approach employs the hash value of the weight vectors. This method has several advantages, including (1) the use of a GAN-based PRNG to generate the input vector. (2) Over the public channel, complete binary tree-based group mutual neural synchronization of ANNs generates the session key. (3) In contrast to previous approaches, the proposed method enables two communication entities to detect full coordination more quickly. (4) This suggested system considers brute force, geometry, and majority assaults. Tests are carried out to test the proposed methodology's performance, and the findings demonstrate that it outperforms similar techniques currently in use.