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NIST’s Computer Security Division has decided to withdraw eleven (11) SP 800 publications on August 1, 2018. These publications are out of date and will not be revised or superseded. After they are withdrawn, their details and links to the PDFs will remain available on CSRC for historical reference.
For the complete list, see this CSRC Update at
https://csrc.nist.gov/news/2018/nist-to-withdraw-eleven-outdated-sp-800-pubs