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Two-Person Integrity
  • (TPI) System of storage and handling designed to prohibit individual access to certain COMSEC keying material, by requiring the presence of at least two authorized persons, each capable of detecting incorrect or unauthorized security procedures with respect to the task being performed. NOTE: Two-person integrity procedures differ from COMSEC no-lone zone procedures in that, under two-person integrity controls, two authorized persons must directly participate in the handling and safeguarding of the keying material (as in accessing storage containers, transportation, keying/rekeying operations, and destruction). COMSEC no-lone zone controls are less restrictive in that the two authorized persons need only to be physically present in the common area where the material is located. Two-person control refers to nuclear command and control COMSEC material while two-person integrity refers only to COMSEC keying material.