hi, eer..I think we need a defenition of an Rng & Prng that every 1 should agree on. would this help? RNG & PRNG ---------------- 1:>A RNG has an infinite period where as a PRNG has a defenite period after which the sequence will repeat. Atmospheric noise,Radiation decay are examples of RNG's.(Difference) 2:>An RNG & PRNG should pass a series of radomness tests. (Similarity) 3:>For the same set of input parameters,a RNG always give a different output. A PRNG always gives the same set of outputs for the same input parameters (Difference) would any 1 also like 2 review http://www.ircsuper.net/~neo/prng.html thanx. Regards Data. --- Jim Choate <ravage@einstein.ssz.com> wrote:
On Thu, 11 Jul 2002, Sandy Harris wrote:
No. Any good algorithm should produce output that looks /exactly/ like random noise, hence they should all look like each other.
Wrong, not all RNG's have the same statistical output. There is -nothing- in the requirement for a RNG that requires it (radiation sources are not equiprobable for example, they're much more 'zero' than 'one'). There may be boundary conditions on crypto applications that require equiprobable distributions with respect to characters or strings (that 'k' thing again, see Knuth). But that doesn't apply to -all- RNG's or their applications by a long shot.
Also, 'random noise' is redundent. 'Noise' is by -definition- random, otherwise it wouldn't be noise, it would have a correlation factor, once you found it you could remove the noise (assuming of course its computationaly tractible).
--
____________________________________________________________________
When I die, I would like to be born again as me.
Hugh Hefner ravage@ssz.com www.ssz.com jchoate@open-forge.org www.open-forge.org
--------------------------------------------------------------------
__________________________________________________ Do You Yahoo!? Yahoo! Autos - Get free new car price quotes http://autos.yahoo.com