https://stackoverflow.com/questions/7554831/faster-random-generator-in-tomcat-7 https://www.digitalocean.com/community/tutorials/how-to-setup-additional-entropy-for-cloud-servers-using-haveged https://stackoverflow.com/questions/137212/how-to-deal-with-a-slow-securerandom-generator
https://stackoverflow.com/questions/7554831/faster-random-generator-in-tomcat-7
https://www.digitalocean.com/community/tutorials/how-to-setup-additional-entropy-for-cloud-servers-using-haveged
https://stackoverflow.com/questions/137212/how-to-deal-with-a-slow-securerandom-generator