Individual with assigned responsibility for maintaining the appropriate operational security posture for an information system or program.
Source(s):
NIST SP 800-128
from
NIST SP 800-37
NIST SP 800-37 Rev. 2
Individual assigned responsibility by the senior agency information security officer, authorizing official, management official, or information system owner for maintaining the appropriate operational security posture for an information system or program
Source(s):
NIST SP 800-137A
under System Security Officer (SSO)
from
NIST SP 800-37 Rev. 2
Individual with assigned responsibility for maintaining the appropriate operational security posture for a system or program.
Source(s):
NIST SP 800-53 Rev. 5
from
NIST SP 800-37 Rev. 2
NIST SP 800-53A Rev. 5
from
NIST SP 800-37 Rev. 2