A fraudulent business transaction application (FBTA) is provided in embodiments of the present invention for monitoring fraudulent transactions. When a consumer supplies account access information in order to carry out an Internet business transaction, the FBTA uses an online fraud mitigation engine to detect phishing intrusions and identity theft. Embodiments are also provided for calculating travel velocity and transaction frequency, which are useful for determining a fraudulent transaction. Further embodiments are provided for authenticating a transaction using a cookie stored on a client device and a behavior profile stored on a server.