Mobile Ad Hoc Network (MANET) and Vehicular Ad Hoc Network (VANET) are autonomous systems connected by wireless communication on a peer-to-peer basis. They are self-organized, self-configured, and self-controlled infrastructure-less networks. These kinds of networks have the advantage of being able to be set-up and deployed anywhere and anytime because it has a simple infrastructure set-up and no central administration. Distributing information between these nodes over long ranges in such networks, however, is a very challenging task, since sharing information always has a risk attached to it, especially when the information is confidential. The disclosure of such information to anyone else other than the intended parties could be extremely damaging. They are explored in this chapter.