CEAACK MANETs are vulnerable to attacks and this can be reduced by employing a cluster mechanism which ensures that packet transmission occurs without unnecessary delay. Clustering can be made effective in CEAACK MANETs by opting for a cluster head mechanism which ensures that control rests with a single powerful node within a cluster. This cluster head takes on the responsibility of routing the packets efficiently by coordinating with the base station. Cluster heads are also prone to malicious attacks and is affected more than a normal network. In this paper we try to incorporate a new approach in CEAACK MANETs by implementing a cryptographic technique to tackle the vulnerabilities of the network. This cryptographic is highly secure which uses a distinct classified digital key which can be generated dynamically using the Advanced Encryption Standard(AES) Algorithm. This technique can ensure that data is securely transmitted in a reliable manner. This scheme aims at transmission efficiency and also tries to reduce the intrudes in CEAACK MANETs.