Released January 10, 2018 This Recommendation specifies the design principles and requirements for the entropy sources used by Random Bit Generators, and the tests for the validation of entropy sources. These entropy sources are intended to be combined with Deterministic Random Bit Generator mechanisms that are specified in SP 800-90A to construct Random Bit Generators, as specified in SP 800-90C. Why buy an eBook when you can download a PDF for free? First you gotta find it and make sure it’s the latest version, not always easy. It’s much more cost-effective to just order the latest version from Amazon.com Unlike a PDF, this eBook allows easy page navigation because we bookmarked the Chapters and Appendices. (Don’t judge based on the free sample because that functionality is not activated on the free sample.) Once you buy a copy you will see how easy it is to get to the information you seek - fast. This material is published by 4th Watch Publishing Co. We publish tightly-bound, full-size books at 8 ½ by 11 inches, with glossy covers. 4th Watch Publishing Co. is a Service Disabled Veteran Owned Small Business (SDVOSB) and is not affiliated with the National Institute of Standards and Technology. A full copy of over 300 cybersecurity standards is loaded on our CyberSecurity Standards Library DVD which is available at Amazon.com. And, if you need to look up an acronym or the definition of a word, just go to the Cyber Dictionary.