To secure Internet transactions from being threatened or attacked, various technologies have been developed. Current technologies still cannot comprehend various threats and attacks. Inspired by this situation, the work described in this book aims to contribute in a better approach in securing Internet transactions. A control system model based on a systems approach for Internet transactions is proposed, and the functionalities of the model are also specified. To analyse patterns of threats and attacks within Internet transactions, an artificial intelligent patterns recogniser is developed. With the patterns recogniser, transaction patterns can then be memorised, recognised, and ultimately analysed. Despite a great amount of patterns, the accuracy of the patterns recogniser is not affected by the number of memorised or recognised patterns. This approach works fast, hence it is suitable for real time processes of Internet transactions. The control system is used for monitoring traffic and system, analysing it through the patterns recogniser, and responding to suspicious or abnormal activities in real time.