There is no 'security product': you must engage in the permanent tracking of security flaw and intrusion: do heavily trap your kernel/applications, do man-in-th

There is no 'security product': you must engage in the permanent tracking of security flaw and intrusion: do heavily trap your kernel/applications, do man-in-the-middle traffic analysis between known traffic and unknown traffic, do not trust off-the-self crypto, etc. But the basics are not even here: you should not use any compiler, all critical pieces of software should be assembly written with very lean SDK (aka extremely stable machine code), namely without the abuse of macro-preprocessor. Everything else is just posture.