NIST SP 800-21 Guideline for Implementing Cryptography In the Federal Government
NIST SP 800-77 Guide to IPsec VPNs
NIST SP 800-32 Introduction to Public Key Technology and the Federal PKI Infrastructure
FIPS 140 Security Requirements for Cryptographic Modules
FIPS 197Announcing the Advanced Encryption Standard (AES)
NIST Cryptography Listing of NIST publications relating to cryptography.
For more information, please choose one of the above links. Note that each link will open a PDF file.