Re: Prng Alvo

On Fri, 17 Apr 2009 12:01:06 -0700 (PDT), Phoenix
<ribeiroalvo@xxxxxxxxx> wrote:

Hi rossum.

I say it is not periodic, only mathematically speaking. We all now the
limits of the computer.
Exactly. Even without a computer, where are you going to get a big
enough piece of paper to write down the number when it gets to
trillions of significant digits? Any practical PRNG must repeat
unless you have an infinite computer or an infinite piece of paper as
well as an infinite amount of time. Being periodic is unavoidable;
you merely need to show us what the period is. A large enough period
may well be fine; claiming to be "aperiodic" is not.

As for the bad seed, all the algorithms still have this problem that.
And we now to there are good and bad seeds. Why? I think, is solved
with an increase on the seed or X0. Also I say in my web page that the
seed should not be integer or less than 1, that can be solved with a
incremnto initial in X0 or on the seed.
You will need to show your revised algorithm. 1.000000000000001 is
neither an integer nor less than 1.0 and is still a bad seed.

I fully agree that it is cryptographically not safe.
Correct. Then why post it to sci.crypt? Perhaps some other group
such as sci.math might be better, and would get you a more useful
response. Here we tend to evaluate PRNGs in terms of their
cryptographic usefulness. Fast but insecure is no good for
cryptography. Slow and secure is much better, Blum Blum Shub being a
case in point. BBS is slower than your algorithm but much more
secure. And yes, BBS is periodic.

Mathematical and statistical this algorithm on the tests produces good
results quickly, and is easy to implement in any applications.

This algorithm is not only with defects, it must have some virtues.
It is better than some I have seen.

rossum


Alvo

.

Relevant Pages

  • Re: Prng Alvo
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