Explore fraud detection techniques and real-time trust decisions in this 47-minute conference talk from BSidesSF 2016. Delve into the parallels between fraud detection and computer security, examining adversarial and technological ecosystems with exploits and attack surfaces. Learn about the challenges faced by businesses in identifying fraudulent activity as the on-demand economy shortens the window between purchase and service delivery. Discover common methods fraudsters use to attack online commerce, from traditional storefront attacks to challenges in real-time marketplaces. Gain insights into techniques and technologies employed to combat online fraud, drawing parallels with traditional network and application security practices. The talk covers topics such as the Target Credit Card Breach, credit card fraud history, classic attacks, reshipping, relationship graphs, machine learning, and lessons learned in security.