Mobile Ad hoc Networks are wireless infrastructure less networks can be easily formed or deployed due to its simple infrastructure. Security has become a primary concern in order to provide protected communication between mobile nodes in a hostile environment. The main objective of this work is to enhance the performance of the network by securing the data and to minimize the malicious nodes which disturb the stream of the network. Securing data is a critical task which can be achieved by cryptographic algorithms and disturbance detection plays as a crucial ingredient in any comprehensive security solution to address the threats. Hence a Novel Cryptographic Algorithm with a new Disturbance Detection System (DDS) has been proposed for Mobile Adhoc Networks. This method prevents the outside attacks to obtain any information from any data exchange in network and also use promiscuous mode of working along with rating and collaborative decision making based on multiple threshold values. The proposed algorithm was implemented and simulated in the Glomosim and the result analysis proved that the performance of the network is increased.