TY - GEN AU - Zella G Ruthberg AU - Robert G McKenzie C2 - , National Institute of Standards and Technology, Gaithersburg, MD DA - 1980-01-01 05:01:00 DO - https://doi.org/10.6028/NBS.SP.500-57 LA - en PB - , National Institute of Standards and Technology, Gaithersburg, MD PY - 1980 TI - Audit and evaluation of computer security II: ER -