An ad hoc network is a highly dynamic routing network cooperated by a set of wireless mobile nodes without any assistance of centralized access point. ARIADNE is a well-known secure on-demand ad hoc network routing protocol. After finishing the Route Discovery protocol, it just finds one route for the source and the destination nodes. However, the intermediate nodes can’t use that route to transmitting data for themselves. For reducing the Route Discovery broadcast packets and reusing the valid route for increasing the packet delivery ratio, we present a new secure on-demand routing protocol based on ARIADNE, called I-ARIADNE. We design the authentication mechanism for the intermediate nodes to verify the route information and reuse it for another route discovery request. Such design can reduce the broadcast packets. Later, they can use that route for transmitting data to other nodes on it. From simulation results, by using our protocol the performance of the entire network environment will be enhanced.