This recommendation specifies mechanisms for the generation of random bits using deterministic methods the methods provided are based on either hash functions or block cipher algorithms search search csrc menu search search information technology laboratory computer security resource center computer security resource center publications sp 800 90a rev 1 recommendation for random number . This recommendation specifies mechanisms for the generation of random bits using deterministic methods the methods provided are based on either hash functions block cipher algorithms or number theoretic problems search search csrc menu search search information technology laboratory computer security resource center computer security resource center publications sp 800 90a withdrawn on . Nist sp 800 90a rev 1 recommendation for random number generation using deterministic rbgs reports on computer systems technology the information technology laboratory itl at the national institute of standards and technology nist promotes the us economy and public welfare by providing technical leadership for the nations. This recommendation specifies mechanisms for the generation of random bits using deterministic methods the methods provided are based on either hash functions or block cipher algorithms supersedes sp 800 90a january 2012. Recommendation for random number generation using deterministic random bit generators published august 13 2015 authors elaine b barker larry feldman gregory a witte abstract this bulletin summarizes the information presented in nist sp 800 90a revision 1 the publication specifies mechanisms for the generation of random bits using deterministic methods the methods provided are