Is the concept of 'defence in depth' outdated? In this interview, Matt Alderman of Tenable Network Security explains that, while organisations may have a lot of security solutions - such as firewalls, intrusion detection and anti-malware - they're not necessarily using the systems in the most effective way. Rather than just dump the information these point solutions give you into a Security Information and Event Management (SIEM) system, hoping you can make sense of it, maybe it's time to adopt 'big data' methods.