TY - RPRT TI - Guideline for implementing cryptography in the federal government AU - Barker, E B AU - Barker, W C AU - Lee, A PY - 2005 PB - National Institute of Standards and Technology CY - Gaithersburg, MD SN - NIST SP 800-21e2 DO - 10.6028/NIST.SP.800-21e2 ER -