TY - GEN AU - Burr, W E AU - Dodson, D F AU - Newton, E M AU - Perlner, R A AU - Polk, W T AU - Gupta, S AU - Nabbus, E A 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 -