ABSTRACT
Wireless Sensor Network (WSNs) are deployed at aggressive environments which are vulnerable to various
security attacks such as Wormholes, Denial of Attacks and Sybil Attacks. There are various intrusion detection
techniques that are used to identify attacks in a network with high accuracy level. This paper has focused on
Denial of Service attack, since it is the most common attack that affects the environment severely. Therefore a new
hybrid technique combining Hidden Markov Model with Ant Colony Optimization (HMM+ACO) has been
proposed that gives improved performance than the other techniques.
Keywords: - ACO, Denial of Service, HMM ,Intrusion Detection,Wireless Sensor Network