To add to tptacek's excellent comment, it's important to remember that some of the characteristics of /dev/random and /dev/urandom discussed here only apply to

To add to tptacek's excellent comment, it's important to remember that some of the characteristics of /dev/random and /dev/urandom discussed here only apply to Linux; not other operating systems such as Solaris: https://blogs.oracle.com/darren/entry/solaris_random_number_generation https://blogs.oracle.com/darren/entry/solaris_random_number_... I'm certain OpenBSD differs here as well.