True random numbers in Sol10 Post: 302978144

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Operating Systems Solaris True random numbers in Sol10 Post 302978144 by drl on Tuesday 26th of July 2016 04:38:42 PM

07-26-2016

Registered User

Hi.

Some suggestions:

Code:

Sources of true random sequences
        0) AVOID /dev/random /dev/urandom:

        The kernel random-number generator is designed to produce
        a small amount of high-quality seed material to seed a
        cryptographic pseudo- random number generator (CPRNG). It
        is designed for security, not speed, and is poorly suited
        to generating large amounts of random data. Users should be
        very economical in the amount of seed material that they
        read from /dev/urandom (and /dev/random); unnecessarily
        reading large quantities of data from this device will have
        a negative impact on other users of the device.
        -- excerpt from man urandom

        1) http://www.fourmilab.ch/hotbits/

        2) http://random.irb.hr/index.php

        3) https://www.random.org/

        4) perl module: 
           Net::Random - get random data from online sources
           Sample output, 5 integers (min, max vary):
            From fourmilab.ch   : 600 1785 384 1466 1212
            From qrng.anu.edu.au: 2498 2234 2071 2573 2868
            From random.org     : 7014 5940 5911 6289 3246

Best wishes ... cheers, drl

Last edited by drl; 07-26-2016 at 05:44 PM..

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LEARN ABOUT OPENSOLARIS

srand

rand(3UCB)					     SunOS/BSD Compatibility Library Functions						rand(3UCB)

NAME

       rand, srand - simple random number generator

SYNOPSIS

       /usr/ucb/cc [ flag ... ] file ...

       int rand();

       int srand(seed)
       unsigned seed;

DESCRIPTION

       rand()  uses a multiplicative congruential random number generator with period 2^32 to return successive pseudo-random numbers in the range
       from 0 to 2^31 -1.

       srand() can be called at any time to reset the random-number generator to a random starting point. The generator is initially seeded with a
       value of 1.

SEE ALSO

       cc(1B), drand48(3C), rand(3C), random(3C)

NOTES

       Use of these interfaces should be restricted to only applications written on BSD platforms.  Use of these interfaces with any of the system
       libraries or in multi-thread applications is unsupported.

       The spectral properties of rand() leave a great deal to be desired. drand48(3C) and random(3C) provide much better, though more	elaborate,
       random-number generators.

       The low bits of the numbers generated are not very random; use the middle bits. In particular the lowest bit alternates between 0 and 1.

SunOS 5.11							    30 Oct 2007 							rand(3UCB)