Interrosec is a cybersecurity firm that maps valid communications within a client’s network using its Flowsight product. Nonvalid communications, including those potentially initiated by an attacker, can be blocked and logged. This helps prevent hackers from moving through a network and gaining access to increasingly valuable information. High-profile hacks are often accomplished by infiltrating a single machine on a network through a spear phishing email. This was the case in recent hacks at Colonial Pipeline, Universal Health Services and SolarWinds. While PCI DSS compliance requires se...