&gt; You cannot learn from your enemy without invasive action, and you cannot test your capabilities without constantly attacking your adversaries...<p>I&#x27;m sorry but this just sounds unethical and wrong.  So much can be learned passively.<p>This is a good read: <a href="https:&#x2F;&#x2F;www.nostarch.com&#x2F;silence.htm" rel="nofollow">https:&#x2F;&#x2F;www.nostarch.com&#x2F;silence.htm</a>