Explore industrial control protocol vulnerabilities and attack techniques in this 50-minute conference talk from Circle City Con 2014. Delve into the intricacies of HMI systems, L2 and L3 networks, firewalls, and PLCs, with a focus on their inherent security flaws. Learn about Modbus functionality, application firewalls, and sniffing techniques. Discover the concept of "tape loops" for manipulating industrial protocols, and understand their potential impact on various systems. Examine the motivations behind exploiting these vulnerabilities and consider the broader implications for industrial cybersecurity.