Re: Hardware generators was: your mail

[SINCLAIR DOUGLAS N <sinclai@ecf.toronto.edu>]

> The card design isn't so much security as avoiding scarce real estate on
> a PC (which, at somewhere over 130 million units fielded, is a not
> inconsiderable market segment).  If this were a dongle device, I'd want
> it on a parallel port.  Many machines don't have a spare serial port,
> and transparent dongles would be harder to do there, anyway.  But
> transparent parallel port dongle technology is already established.

I agree.  I have constructed a parallel port RNG that sampled a blank
AM radio band for its source.  The data lines give plenty of power to
the device, and there are dedicated feedback lines (busy, paper_out, &c).

However, I had a very informative discussion with Eric Hughes at
CF '94 where I learned that this was the wrong way to go to get good
random numbers.  Maybe he would like to comment since I don't
believe I can do justice to his argument.