If you're on Linux and need a block of randomness of decent quality, you may defer to system's random generator. Tools like shuf use the same under the hood.
#! /usr/bin/perl
use strict;
use warnings;
sub rnd_bytes {
local $/ = \( shift || 8 );
open my $fh, '<', '/dev/urandom';
scalar <$fh>
}
for my $n (unpack "Q*", rnd_bytes(20 * 8)) {
printf "\r%064b %016X\n",$n,$n;
}
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