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covert channel

Definition(s):

  An unintended or unauthorized intra-system channel that enables two cooperating entities to transfer information in a way that violates the system's security policy but does not exceed the entities' access authorizations.
Source(s):
CNSSI 4009-2015 from IETF RFC 4949 Ver 2
NIST SP 800-53 Rev. 5 from CNSSI 4009-2015