System Models with Threshold Cryptography for Withdrawal of Nodes Certificate in Mobile Ad Hoc Networks

Abstract

Achieving security in mobile ad hoc network (MANET) is somewhat difficult compare to wired network because in ad hoc network malicious nodes can freely move from one location to another location and thus able to launch attacks against different nodes. In our previous work, we have explained a simple method to identify the malicious node that is collect information from, n nodes present in MANETs; but in that approach it is difficult to achieve efficient and secure key management as well as it is difficult to differentiate between valid and false accusation made by well-behaving and malicious nodes. As an extension to our previous work, this paper will help to achieve more security by using efficient key management technique. In this technique, we are dividing the functionality of the certificate authority. Threshold sharing techniques are used for distributing CA functionality. In this mechanism, every node present in the network will hold a piece of certificate authority signing key and multiple nodes in a one-hop monitoring range will jointly provide complete service. This paper also clarifies how to distinguish between legal and false accusations messages, as well as different system models will help our planned scheme for revoking the certificate of malicious node efficiently, and for avoiding false accusation attack which can occur due to inside malicious node.