I look at another part of society, where the hacking and getting hacked has a long tradition- lawyers and the law. And money subverts them all. In the long run.
So lets look at yet another part of society- our own bodys. How does the body detect intruders, or even prevent theire entrance?
1) Provide no interface for hacking. Our stomaches and colons are our main energy interface - they regenerate at a increddible rate. Slimy, colon cells, they live fast, they die fast, holding on to them is near impossible.
2) Have a pre-warn system for getting hacked. If your sensory apparatus deteriorates, go in full reverse on all operations.
3) A general good feature to have - the ability to undo damage, by doing a full reset to a previously working state. Good in software development, good for a society, its a nice last line of defense, that the comon citizen can veto-vote direct democratic.
4) Divide and Conquer: Prevent accumulations of power, by allowing monopolies to be legally usurped. Can proof your employer is in a cartel/monopoly?
Congratualations, you are allowed to march out with x% of the company into a seperate company.
5)Dont be a static target. A passive defense is weakness, as it gives the attacker infinite attempts. If attacked, and the attack is proofable, dissolve the attacker, integrate his strengths into the defenses.