I&#x27;ve heard that reading from &#x2F;dev&#x2F;random tends to &quot;steal&quot; entropy from &#x2F;dev&#x2F;urandom or something.  I&#x27;m not sure.  But if you only use urandom, you&#x27;re safe.  Here, from a quick search:  <a href="http:&#x2F;&#x2F;sockpuppet.org&#x2F;blog&#x2F;2014&#x2F;02&#x2F;25&#x2F;safely-generate-random-numbers&#x2F;" rel="nofollow">http:&#x2F;&#x2F;sockpuppet.org&#x2F;blog&#x2F;2014&#x2F;02&#x2F;25&#x2F;safely-generate-random...</a>  <a href="http:&#x2F;&#x2F;www.2uo.de&#x2F;myths-about-urandom&#x2F;" rel="nofollow">http:&#x2F;&#x2F;www.2uo.de&#x2F;myths-about-urandom&#x2F;</a>