In Information Security, intrusion detection is the act

of detecting actions that attempt to compromise the confidentiality,

integrity or availability of a resource. Intrusion detection does not,

in general, include prevention of intrusions. In this paper, we are

mostly focused on data mining techniques that are being used for

such purposes. We debate on the advantages and disadvantages

of these techniques. Finally we present a new idea on how data

mining can aid IDSs.