EvidenceSheet
NIST SP 800-53 Rev 5 · SC - System and Communications Protection

SC-31 Covert Channel Analysis. Perform a covert channel analysis to identify those aspects of communications within the system that are potential avenues for covert [organization-defined] channels; and Estimate the maximum bandwidth of those channels

Covert Channel Analysis. Perform a covert channel analysis to identify those aspects of communications within the system that are potential avenues for covert [organization-defined] channels; and Estimate the maximum ban.

5
artefacts
0
held by a system
1
at each review
hard
to go live
Document repository
where the evidence lives
teal = a system already holds it · olive = produced at each review

system holds itEvidence a system already holds

none for this control

periodic reviewEvidence produced at each review

  • Evidence the analysis was repeated after significant design change · Document repository

governing documentDocuments that govern the control

  • The covert channel analysis documentation identifying potential storage or timing channels · Document repository
  • The defined channel types analysed, and the scope of communications covered · Policy repository / GRC workspace
  • Estimated maximum bandwidth for each channel identified · Document repository
  • Decisions on each channel, whether accepted, reduced or eliminated, with rationale · Document repository

First move

This control is evidenced by people and documents, not systems. Put the document under version control with an owner and review date, and log each review as a record with reviewer and date. Do not try to automate it.

Common gaps auditors find

Do this for your whole sheet

Paste the rows you run your controls from and get this mapping for every control at once, with the periodic-review ones flagged and a first move per row. No account for the first run.

Build my evidence sheet

SC-30 Concealment and Misdirection. Employ the following concealment and misdirection techniques for [organization-defined] at [organization-defined] to confuse and mislead adversaries: [organization-defined] · SC-32 System Partitioning. Partition the system into [organization-defined] residing in separate [organization-defined] domains or environments based on [organization-defined]