The focus on the perimeter has led to a reduction in breaches caused by traditional hacking. But this focus has also left everything inside the perimeter vulnerable to breaches that are more commonly affecting today's businesses -- lapses or breakdowns in internal processes, disgruntled employees walking off with laptops, mistakes by couriers and shipping companies, contractors not taking proper precautions with sensitive data, poorly-trained customer service employees -- all of which render perimeter-based security approaches practically useless.