Help! Is there a doctor in the network???
July 23rd, 2010 |
Cyber security is a hot topic, especially in national security circles. The world has witnessed a number of high-profile incidents in the past two years that have been notable for sharing three very important aspects:
- they were targeted attacks, carried out against specific institutions
- they were politically motivated, and, inconclusively, appear to be state-sponsored
- they used multiple-step, multi-vectors attacks and managed to evade existing security countermeasures
This deviates from the types of attacks that IT-centric approaches have sought to defend networks against. Traditional approaches neutralize the perceived threats against a network with a host of countermeasures: firewalls, malware scanners, automated network vulnerability scanning, patch policies, and intrusion detection systems. The network defenses can learn new tricks when the administrators update the signatures, or, for certain types of data, employ a Bayesian inference strategy (as has been employed to fight spam). This approach does a good job of protecting against untargeted attacks as well as weak targeted attacks.
Full network defense requires human analysts looking at anomalies at a level above the automated countermeasures. Check out the rest of this post to take a look at how human-driven, computer-aided analysis is a game changer in cyber security.








