Abstract: Internet usage has increased exponentially and has managed to cover all geographical areas across the world. Business-to-business (B2B), business-to-consumer (B2C), Internet-based e-commerce transactions, and Internet banking have come of age and are facing serious threats of attack, penetration or intrusion, despite the best available firewalls. Efficient and modern security tools are required to prevent information loss during internet banking and e-commerce transactions. One such tool that provides protective mechanism during internet based e-commerce transactions and banking is Intrusion Detection System. This paper discusses the types of attacks and how Intrusion Detection Systems can detect and prevent those attacks and intrusions during internet banking and other e-commerce based transactions.

Keywords: Intrusion, Intrusion detection system, Phishing, Pharming, MitM, MitB, Trojan horse virus, NIDS, HIDS.