From perl5200delta#rand-now-uses-a-consistent-random-number-generator
- rand now uses a consistent random number generator
Previously perl would use a platform specific random number generator, varying between the libc rand(), random() or drand48().
This meant that the quality of perl's random numbers would vary from platform to platform, from the 15 bits of rand() on Windows to 48-bits on POSIX platforms such as Linux with drand48().
Perl now uses its own internal drand48() implementation on all platforms. This does not make perl's rand cryptographically secure. perl #115928
If you are desperate enough, try calling the original 15 bits windows version.
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