"That sounds pretty secure," Kyle answered. "However, I always tell you what you should tell the others, which means you know the contents of my messages. Isn't that a weak point?"
"It's a necessary evil," Major Sovignor answered. "Telling the senders how to encode the message themselves means spreading the way it works to a multiple of people. More people means more security risks. Besides, every leader of any base has sworn a strict oath. If we betray Humanity, we will die. We could also force every member to swear this oath, but this might create resentment. Such an oath is difficult to bear."
Kyle scratched the back of his head. "Can't you just use a Formation Array?"
"Every Formation Array has a design, and that design can be compromised. Formation Arrays can't swear oaths. A compromised person will share one message. A compromised Formation Array will spread countless before someone finds the injected flaw," Major Sovignor explained.
