Do we have a way to make... truly secure scripts?

You're almost certainly correct, of course, most languages just use linear congruential generators and I'd expect LSL to just call through to the underlying C library for something like this.

The other thing to watch out for with this function is that because it returns a float, you can't get (much) more than 23 bits of randomness out of it at a time. So don't take the result of an llFrand call, multiply it by 4 billion and think you've got a full-range random channel number.

Right. And we can't set a seed in LSL, so we can only really expect it to be RANDOM. It cannot repeat a pseudo-random sequence given a key as seed for example. Might be a nifty feature to ask for though.


Try this:

integer rand = (integer)llFrand((float)(1 << 16)) << 16 | (integer)llFrand((float)(1 << 16));

or for only negative numbers:

integer negRand = 0x80000000 | (integer)llFrand((float)(1 << 15)) << 16 | (integer)llFrand((float)(1 << 16))