TY - GEN AU - Gait, Jason C2 - , National Institute of Standards and Technology, Gaithersburg, MD DA - 1980-01-01 05:01:00 DO - https://doi.org/10.6028/NBS.SP.500-61 LA - en PB - , National Institute of Standards and Technology, Gaithersburg, MD PY - 1980 TI - Maintenance testing for the data encryption standard: ER -