In Ruby you should use the SecureRandom module, but even that has had issues in the past. http://ruby-doc.org/stdlib-2.3.1/libdoc/securerandom/rdoc/index.html

In Ruby you should use the SecureRandom module, but even that has had issues in the past. http://ruby-doc.org/stdlib-2.3.1/libdoc/securerandom/rdoc/index.html http://ruby-doc.org/stdlib-2.3.1/libdoc/securerandom/rdoc/in... https://news.ycombinator.com/item?id=11624890 https://news.ycombinator.com/item?id=11624890