Security analysis on a conference scheme for mobile communications

10.1109/TWC.2006.1638641IEEE Transactions on Wireless Communications561238-124

Multiple Bridge Secret Delivery in Wireless Sensor Networks

Achieving security in wireless sensor networks is a challenging problem due to the inherent resource and computing constraints. Several key distribution techniques have been proposed in the technical literature for efficient distribution of keys to the nodes prior deployment. These techniques establish secure links for some pairs of physically connected nodes but leave other pairs alone. Remaining nodes use multi-hop scheme to form a secured path connecting these links. Using this technique, the secret is disclosed to all the nodes on the path. Therefore, if any of the nodes is compromised by an adversary, secret is disclosed to the adversary. To solve this problem, a scheme called Babel was proposed recently that finds common bridge node to deliver secret link keys to their neighbors. In this scheme regular paths are used to deliver multiple keys with the common bridge node, hence key compromise probability is lowered compared to previous techniques. Our work is based on the Babel scheme and has several advantages. In our work we propose a new scheme that finds multiple bridge nodes to deliver secret link keys to all its physical neighbors. Keys are distributed to multiple bridge nodes instead of one common bridge node to establish secure connections to the disconnected nodes. Hence even if a few of the bridge nodes are compromised, secret will not be disclosed to the adversary. We present the details of our scheme's design and investigate the connectivity and security performance of our scheme in this thesis

A Key Management Scheme for Wireless Sensor Networks Using Deployment Knowledge

To achieve security in wireless sensor networks, it is important to be able to encrypt messages sent among sensor nodes. Keys for encryption purposes must be agreed upon by communicating nodes. Due to resource constraints, achieving such key agreement in wireless sensor networks is non-trivial. Many key agreement schemes used in general networks, such as Diffie-Hellman and public-key based schemes, are not suitable for wireless sensor networks. Pre-distribution of secret keys for all pairs of nodes is not viable due to the large amount of memory used when the network size is large. Recently, a random key predistribution scheme and its improvements have been proposed