RS232 Crypto Dongle (idea for widely accessible crypto technology)

Yanek writes:

Also, it would not require ANY special software on the host or the pc, nor any special terminal. [A magical kingdom of compatibility is described.]

In practice, it will be impossible to make a device that does anything transparently. Software has to be rewritten and redesigned around crypto security. It is wise not to underestimate or overestimate the difficulty of doing this. Eric