TY - RPRT TI - Digital identity guidelines: enrollment and identity proofing AU - Grassi, Paul A AU - Fenton, James L AU - Lefkovitz, Naomi B AU - Danker, Jamie M AU - Choong, Yee-Yin AU - Greene, Kristen K AU - Theofanos, Mary F PY - 2017 PB - National Institute of Standards and Technology CY - Gaithersburg, MD SN - NIST SP 800-63a DO - 10.6028/NIST.SP.800-63a ER -