Computer Security: A Machine Learning Approach by Sandeep V. Sabnani Abstract: In this thesis, we present the application of machine learning to computer security, particularly to intrusion detection. We analyse two learning algorithms (NBTree and VFI) for the task of detecting intrusions and compare their relative performances. We then comment on the suitability of the NBTree algorithm for the intrusion detection task based on its high accuracy and high recall. We finally state the usefulness of machine learning to the field of computer security and also comment on the security of machine learning itself.