The generation of random and pseudo-random numbers is an area fraught with pitfalls for the unwary.

It is, of course, in the nature of things that deterministing software cannot generate true random numbers. The best we can hope for is pseudo-random number sequences - sequences of numbers with many of the statistical properties of random numbers.

Of course, in threads asking questions of this sort - of which there are a great many - it generally turns out that a fairly simple pseudo-random number generator will suffice.

You will find some LFSR based pseudo-random number generators here:

http://www.programmersheaven.com/zone5/cat.../32219.htm