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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rand

rand(3C)																  rand(3C)

NAME

       rand(), rand_r(), srand() - simple random-number generator

SYNOPSIS

DESCRIPTION

       uses  a	multiplicative,  congruential, random-number generator with period 2^32 that returns successive pseudo-random numbers in the range
       from 0 to 2^15-1.

       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.

       returns a random number at the address pointed to by the randval parameter.  The seed parameter can be set at any time to start the random-
       number generator at an arbitrary point.

   Note
       The spectral properties of leave a great deal to be desired.  provides a much better, though more elaborate, random-number  generator  (see
       drand48(3C)).

RETURN VALUE

       If seed or randval is NULL, returns 0.  Otherwise, returns a psuedo-random integer.

EXAMPLES

       The following:

	      int x, y;
	      srand(10);
	      x = rand();
	      y = rand();

       would produce the same results as:

	      int x, y, s = 10;
	      x=rand_r(&s);
	      y=rand_r(&s);

WARNINGS

       Users  of  should  note	that  rand_r()	now conforms with POSIX.1c.  The old prototype of is supported for compatibility with existing DCE
       applications only.

SEE ALSO

       drand48(3C), random(3M), thread_safety(5), random(7).

STANDARDS CONFORMANCE

																	  rand(3C)