From:

James Kanze <james.kanze@gmail.com>

Newsgroups:

comp.lang.c++,comp.lang.c,sci.crypt

Date:

Wed, 11 Jun 2008 02:36:37 -0700 (PDT)

Message-ID:

<93345e77-7354-41e8-a4c9-d851e3dce274@j22g2000hsf.googlegroups.com>

On Jun 11, 12:17 am, "Adem24" <ade...@nospammplease.org.invalid>

wrote:

wrote:

I need a good and fast random number generator (RNG), and a

linear congruential generator (LCG), both with a max period

Additional requirements:

- Must use [unsigned] integer-values only (32 or 64 bit), no floating po=

linear congruential generator (LCG), both with a max period

= 31 bits; the bigger the better.

Additional requirements:

- Must use [unsigned] integer-values only (32 or 64 bit), no floating po=

int.

- The RNG should have passed some statistical tests.

- The "RAND_MAX" of these generators should equal the period.

- The LCG should of course generate each number only once in a period.

- The period of the LCG should easily be changable programmatically

for at least any n of 2^n upto the max possible n.

- They must be written in C or C++.

Which RNG and LCG can you recommend which satisfy these requirements?

- The "RAND_MAX" of these generators should equal the period.

- The LCG should of course generate each number only once in a period.

- The period of the LCG should easily be changable programmatically

for at least any n of 2^n upto the max possible n.

- They must be written in C or C++.

Which RNG and LCG can you recommend which satisfy these requirements?

/dev/random is considered Cryptographically Secure

Pseduo-Random number generator. But I am not aware of its

period. And you don't have the source code for it. Its

implemented in kernel and you will have to manually browse

through the code to get the algorithm. It uses the noise from

the device drivers.

/dev/random is only available on some Unix systems, and it is

not (normally, at least) a pseudo-random generator, but rather

provides access to a truly random source. It can also be

painfully slow, since it must wait for sufficient entropy; it's

very useful for getting a random number to seed an RNG, but it's

probably too slow for any extended use.

The original posting is cross-posted to both comp.lang.c and

comp.lang.c++, so I don't know which language the original

poster uses---if it's C++, Boost has a large collection of

random number generators (which will be incorporated into the

next version of the standard).

--

James Kanze (GABI Software) email:james.kanze@gmail.com

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