Can Cyber Protection be Straight-Forward? - Part 1

In the wake of the recent WCry Ransomware attacks on the NHS I have to ask whether I am missing something; or has the cyber security world disappeared up the backside of complication? Let me ask another question? Is it possible nowadays to adequately protect a system (or network of systems) by reducing the attack possibilities to a level where hackers are more than likely to go look elsewhere? In short, can a system be compromised if an attacker; A. Cannot get their executable code onto it and run it? and; B. Cannot subvert or misuse any existing/resident executable code? I hold that attackers will have a hard time compromising systems if they are prevented from doing both of the above point

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