Our contribution in this area is the creation of lightweight techniques for securing existing sensor network routing and data movement approaches, such as directed diffusion [5], spin [8] and data dissemination [9, 2]. We assume the computational capability and memory requirements typical of those provided by current generation of sensors. We note that in this work we make no attempt to counter the threat from a widespread denial of service attack against the RF layer. As pointed out in [12], such attacks are fairly straightforward to mount against fixed frequency RF communication links that are found in the sensors. Defending against them requires changes to.
