Abstract: Mobile ad hoc networks (MANETs) represent complex distributed systems that comprise wireless mobile nodes that can freely and dynamically self-organize into arbitrary and temporary, ad- hoc network topologies, allowing people and devices to seamlessly internetwork in areas with no pre-existing communication infrastructure, e.g., disaster recovery environments. Ad hoc networking concept is not a new one, having been around in various forms for over 20 years. Routing in Mobile Ad Hoc Networks faces many challenges that are not faced in other networks. These involve limited resources, mobility of nodes and dynamic topology and security. Thus the aim of the routing protocol should be to improve the secured communication among the nodes in the network. Controlling delay and delay variance plays an important role in the functioning of a routing protocol. It helps in selecting a route that is less congested, thus helping to uniformly distribute the traffic among the underlying nodes. It helps keep the performance of the network to an optimal level. This study introduced the security mechanism for Bandwidth Efficient Variance Adaptive Routing Protocol which uses delay and delay variance as the route selection metrics for on demand Distance Vector routing protocol which primarily uses the distance metrics. Security mechanism for this new algorithm uses digital signature and hash function for security and authentication. As this protocol does not involves Public Key Infrastructure for key distribution Digital signatures, the computing overhead reduced and does not require centralized infrastructure.