TY - GEN AU - Frank Heinrich C2 - Special Publication (NIST SP), National Institute of Standards and Technology, Gaithersburg, MD DA - 1978-01-01 DO - https://doi.org/10.6028/NBS.SP.500-21v2 LA - en PB - Special Publication (NIST SP), National Institute of Standards and Technology, Gaithersburg, MD PY - 1978 TI - The Network Security Center: a System Level Approach to Computer Network Security ER -