<?xml version="1.0" encoding="UTF-8"?><!--Serialized by the GTRI Trustmark Framework API, version: 1.4.74--><tf:TrustInteroperabilityProfile xmlns:tf="https://trustmarkinitiative.org/specifications/trustmark-framework/1.4/schema/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:ds="http://www.w3.org/2000/09/xmldsig#"><tf:Identifier>https://artifacts.trustmarkinitiative.org/lib/tips/nist-sp-800-53-r4-security-control-sc-31_-covert-channel-analysis/4/</tf:Identifier><tf:Name>NIST SP 800-53 r4 Security Control SC-31: Covert Channel Analysis</tf:Name><tf:Version>4</tf:Version><tf:Description>Profile of requirements corresponding to NIST Special Publication 800-53, r4, Security Control SC-31: Covert Channel Analysis.</tf:Description><tf:PublicationDateTime>2021-04-26T00:00:00.000Z</tf:PublicationDateTime><tf:Primary>false</tf:Primary><tf:LegalNotice>This document and the information contained herein is provided on an "AS IS" basis, and the Georgia Tech Research Institute disclaims all warranties, express or implied, including but not limited to any warranty that the use of the information herein will not infringe any rights or any implied warranties or merchantability or fitness for a particular purpose. In addition, the Georgia Tech Research Institute disclaims legal liability for any loss incurred as a result of the use or reliance on the document or the information contained herein.</tf:LegalNotice><tf:Issuer><tf:Identifier>https://trustmarkinitiative.org/</tf:Identifier><tf:Name>TMI</tf:Name><tf:Contact><tf:Kind>PRIMARY</tf:Kind><tf:Responder></tf:Responder><tf:Email>help@trustmarkinitiative.org</tf:Email><tf:Telephone>555-555-5555</tf:Telephone><tf:WebsiteURL>https://trustmarkinitiative.org/</tf:WebsiteURL></tf:Contact></tf:Issuer><tf:Keywords><tf:Keyword>800-53</tf:Keyword><tf:Keyword>Communications Protection</tf:Keyword><tf:Keyword>Covert Channel Analysis</tf:Keyword><tf:Keyword>NIST</tf:Keyword><tf:Keyword>P0</tf:Keyword><tf:Keyword>Security</tf:Keyword><tf:Keyword>System</tf:Keyword></tf:Keywords><tf:References><tf:TrustmarkDefinitionRequirement tf:id="TD_ref1"><tf:TrustmarkDefinitionReference><tf:Identifier>https://artifacts.trustmarkinitiative.org/lib/tds/covert-channel-analysis---estimated-bandwidth/1.0/</tf:Identifier><tf:Number>1</tf:Number><tf:Name>Covert Channel Analysis - Estimated Bandwidth</tf:Name><tf:Version>1.0</tf:Version><tf:Description>Defines conformance and assessment criteria for verifying that an organization estimates the maximum bandwidth of potential covert channels.</tf:Description></tf:TrustmarkDefinitionReference></tf:TrustmarkDefinitionRequirement><tf:TrustmarkDefinitionRequirement tf:id="TD_ref2"><tf:TrustmarkDefinitionReference><tf:Identifier>https://artifacts.trustmarkinitiative.org/lib/tds/covert-channel-analysis/1.0/</tf:Identifier><tf:Number>2</tf:Number><tf:Name>Covert Channel Analysis</tf:Name><tf:Version>1.0</tf:Version><tf:Description>Defines conformance and assessment criteria for verifying that an organization performs a covert channel analysis to identify those aspects of communications within the information system that are potential avenues for covert storage or timing channels.</tf:Description></tf:TrustmarkDefinitionReference></tf:TrustmarkDefinitionRequirement></tf:References><tf:TrustExpression><![CDATA[TD_ref1 and TD_ref2]]></tf:TrustExpression><tf:Sources><tf:Source tf:id="Source-2112165102"><tf:Identifier>SP800-53R4</tf:Identifier><tf:Reference>NIST Special Publication 800-53 Revision 4, Security and Privacy Controls for Federal Information Systems and Organizations, National Institute of Standards and Technology, April 2013 (Includes updates as of 01-15-2014). Available at &lt;a href="http://dx.doi.org/10.6028/NIST.SP.800-53r4"&gt;http://dx.doi.org/10.6028/NIST.SP.800-53r4&lt;/a&gt;.</tf:Reference></tf:Source></tf:Sources></tf:TrustInteroperabilityProfile>