Network security lessons from a Bronze age fort

The latest CSO Mag has a thoughtful article about a 3,000 year old Irish cliff-top fort, drawing various analogies between securing a fort vs. securing a network. Unfortunately, interesting though the analogy might be, a 3,000 year old fort offers minimal protection against modern weapons of war. Increasingly sophisticated adversaries using powerful new technologies remain a serious threat in any age. Oh and don't forget the Peasants' Revolt when the Tower Of London was breached by dint of bribing the gatekeeper. Social engineering has a long history too.