This project is a proof -of-concept of self learning intrusion detection systems. The project goal is to prove that it is possible to make this using a Naive Bayesian classifier. Through the project we have tested a dataset using Orange, and seen what kind of classification results we can get. This project does not contribute with any new knowledge in the field of self-learning intrusion detection systems, but has acted as part of our education and has given us more knowledge about the subject.