The following details can be used to understand the six methods listed in Tables B.1 and B.2.

Ability to Transmit: "Can It Talk to Me?"

At the core of all trust, all networks, all interpersonal, and indeed all intrapersonal communication itself, can be found but one, solitary concept: Transmission of information sending something that could represent anything somewhere.

This does not in any way mean that all transmission is perfect.

The U.S. Department of Defense, in a superb (as in, must-read, run, don't walk, bookmark, and highlight the URL for this now) report entitled "Realizing the Potential of C4I," notes the following:

"The maximum benefit of C4I [command, control, communications, computers, and intelligence] systems is derived from their interoperability and integration. That is, to operate effectively, C4I systems must be interconnected so that they can function as part of a larger "system of systems." These electronic interconnections multiply many-fold the opportunities for an adversary to attack them." Realizing the Potential of C4I www.nap.edu/html/C4I

"The only way to secure a system is not to plug it in." Unknown

A system entirely disconnected from any network won't be hacked (at least, not by anyone without local console access), but it won't be used much either. Statistically, a certain percentage of the untrusted population will attempt to access a resource they're not authorized to use, a certain smaller percentage will attempt to spoof their identity. Of those who attempt, an even smaller but nonzero percentage will actually have the skills...