TY - RPRT TI - Attribute considerations for access control systems AU - Hu, Vincent C AU - Ferraiolo, David F AU - Kuhn, D Richard PY - 2019 PB - National Institute of Standards and Technology CY - Gaithersburg, MD SN - NIST SP 800-205 DO - 10.6028/NIST.SP.800-205 ER -