Technique D) You compartmentalize as much as possible and keep the number of people aware of the secrets low.
This is another very useful technique employed by many different kinds of organizations. However, your organization is not interested in small schemes, it is interested in large plots that have proportionally sized rewards. So you face the same problem as every other organization that undertakes large engineering projects. No matter how you arrange matters or how many layers you create, you still end up with 1000's of employees around the world that know highly critical information. And it bears repeating that your employees in particular find betrayal to be an attractive prospect, unlike many of the other oragnizations that use this technique.
Technique E) You make use of kill-switches.
This certainly would put a large scare in your employees, but it has some fatal flaws that can not be corrected. First of all, having a network of kill-switches means that an interfering agency could potentially hijack this network and cause all of your employees to drop dead at a moment's notice. Additionally, what do you do about intentional / accidental faraday cages (planes, boats, certain buildings, etc.)? Do your employees die when they lose network connection? Or can your employees only be killed when they actively receive a network signal?
So, with all of the aforementioned techniques being insufficient, what is the only thing that can possibly let something like your organization survive? What is the "bare-minimum technique" or combination of techniques that attains the high degree of perfect secrecy you require? The bare minimum that could possibly achieve it is this : mind control. Or perhaps more appropriately identified, body control.
For your organization to survive, you require the ability to directly pre-empt your employee's attempts to betray you. Not simply hoping that they will never do so, or simply punishing after the fact, but actively preventing their body from communicating what is happening to outsiders AS they attempt to do so.
From the perspective of secrecy, this technique is almost perfect. And from the philosophical perspective, what is the ultimate betrayal you can experiencePost too long. Click here to view the full text.