The internet has become a convenient way for people exchanging information and doing business over the internet. Uptil now, intrusion detection technique has been using either anomaly based or signature based detection technique. The hybrid technique gives advantages of both the techniques. Anomaly detection strategy is to suspect of what is considered an unusual activity for the subject (users, processes, etc. ) and carry on further investigation. This approach is particularly effective against novel (i. e. previously unknown) attacks. Signature based detection systems detect previously known attack in a timely and efficient way. The Hybrid technique gives better result than signature based or anomaly based technique alone.

Intrusion detection Layered Approach Hidden Markov Model Decision Trees Naive Bayes