We address the problem of securing the route discovery in mobile ad hoc networks, proposing a light-weight yet robust routing protocol, the Distance- Vector Secure Routing Protocol (DV-SRP). DV-SRP discovers on-demand multiple routes, which are established across the network, without providing explicitly the network connectivity. DV-SRP combines the advantages of the type of route discovery first introduced by AODV, with security and thus resilience to adversaries that disrupt the route discovery. Compared to previous proposals in the literature to secure the AODV-like route discovery, DV-SRP is either more robust, or more efficient, or more general.