On September 18, 2017 this (legacy) site will be replaced with the new site you can see at beta.csrc.nist.rip. At that time, links to this legacy site will be automatically redirected to apporpriate links on the new site.
The National Institute of Standards and Technology (NIST) is pleased to announce the release of Special Publication 800-108. Recommendation for Key Derivation Using Pseudorandom Functions. This Recommendation specifies techniquesfor the derivation of additional keying materialfrom a secret cryptographic key using pseudorandom functions. This key can be either established through a key establishment scheme or shared through some other manner.