Barry Shteiman looks at the role of machine learning in cyber security and explains that, while it is not a'silver bullet', it has a distinct role when augmented with human intelligence. Cyber criminals are launching attacks that are far more complex than those security teams faced a decade ago. Long gone are the days when straightforward attacks such as SQL injections were the only worries for security analysts. Cyber criminals are now deploying advanced attacks that may take place over months. For security analysts today, it's just as important to understand the normal behaviour of all business employees as it is to identify suspicious activity.