TY - GEN AU - W E Burr AU - D F Dodson AU - E M Newton AU - R A Perlner AU - W T Polk AU - S Gupta AU - E A Nabbus C2 - , National Institute of Standards and Technology, Gaithersburg, MD DA - 2011-01-01 05:01:00 DO - https://doi.org/10.6028/NIST.SP.800-63-1 LA - en PB - , National Institute of Standards and Technology, Gaithersburg, MD PY - 2011 TI - Electronic authentication guideline: ER -