" Before we began, I thought I had pretty good physical strength and stamina, but I learned both could be better. We started out with a brief introduction to the equipment and layout of the space, and then moved on to an explanation of both fighting and neutral/passive stances. We warmed up with basic bodyweight calisthenics; then progressed to "tagging," where we tried to tag each other's shoulders and knees while standing face-to-face and blocking countermoves. Parker was amazing at tagging, of course, but I started to get the hang of it. The majority of the time, however, was spent covering groundwork and I really sunk my teeth into that. I knew very well what it was like to be down and at a disadvantage. If Parker noted my underlying vehemence, he didn't comment on it. When Gideon showed up at my apartment later that evening, he found me soaking my aching body in my bathtub
eventually with that one inexorable, irreversible, irretrievable factor. Time, for the cryptographer, controls a variable relationship. The most general of the cryptographer's principles deals with the sliding ratio between speed and security; as the need for speed in communications increases, the need for security decreases. Early in the planning of a major operation, messages demand great security because the enemy, if he could read them, would have time to prepare countermoves. But in the heat of battle, commanders may use plain language because the enemy, though he intercepts the messages, may not have time to react effectively. This principle arranges a nation's cryptosystems in a hierarchy in which front-line systems are simple and diplomatic systems secure and more complex. "Of each such system," Friedman wrote, "the best that can be expected is that the degree of security be great enough to delay solution by the enemy for such a length of time that when the
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