Dependable and secure computing involves the authorization of access to the data in a network. It is controlled by the network administrators. To protect the information from loss and make it to be delivered its destination properly. The mobile ad hoc networks are still vulnerable under passive statistical traffic analysis attacks. How to discover the communication patterns without decrypting the captured packets, to present a novel statistical traffic pattern discovery system. It can be discovered Hidden traffic patterns in good accuracy, even without the number of actual sources and destinations and end-to-end communication relations known to the traffic analyzers.