You want to generate numbers that are more random than Perl’s random numbers. Limitations of your C library’s random number generator seeds will sometimes cause problems. The sequence of pseudo-random numbers may repeat too soon for some applications.

Use a different random number generator, such as those provided by the Math::Random and Math::TrulyRandom modules from CPAN:

use Math::TrulyRandom; $random = truly_random_value(); use Math::Random; $random = random_uniform();

Perl uses the standard C library routine *rand*(3) to generate pseudo-random numbers. (This can be changed at build
time, however.) Some implementations of the `rand`

function return only 16-bit random numbers or have algorithmic
weaknesses and may not be sufficiently random.

The Math::TrulyRandom module uses the inadequacies of your system’s timers to generate the random numbers. This takes a while, so it isn’t useful for generating a lot of random numbers.

The Math::Random module uses the `randlib`

library
to generate random numbers. It also includes a wide range of related
functions.

The `srand`

and `rand`

functions in
*perlfunc*(1) and Chapter 3 of
*Programming Perl*; Section 2.7; Section 2.8; the
documentation for the CPAN modules Math::Random and Math::TrulyRandom

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