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CRY-06: Integrity of Data In Transit

CRY 10 — Critical Protect

Cryptographic mechanisms exist to detect unauthorized changes to data in transit.

Renumbered: Formerly CRY-04 in SCF 2025.4.

Code reused: In SCF 2025.4 and earlier, CRY-06 was Non-Console Administrative Access. That control is now CFG-04.7.

Control Question: Are cryptographic mechanisms utilized to detect unauthorized changes to data in transit?

General (31)
Framework Mapping Values
AICPA TSC 2017:2022 (used for SOC 2) (source) CC6.1-POF10
CSA IoT SCF 2 SAP-07
GovRAMP SC-08 SC-08(01)
GovRAMP Low+ SC-08
GovRAMP Moderate SC-08 SC-08(01)
GovRAMP High SC-08 SC-08(01)
IEC 62443-2-1 2024 DATA 1.7
IEC 62443-3-3 2013 SR 3.1 SR 3.1 RE 1
IEC 62443-4-2 2019 CR 3.1 CR 3.1(1)
ISO 27002 2022 8.24 8.26
ISO 27017 2015 10.1.1 14.1.3
ISO 27018 2025 8.24 8.26
MITRE ATT&CK 16 T1020.001 T1040 T1090 T1090.004 T1550.001 T1550.004 T1552.007 T1557 T1557.001 T1557.002 T1557.003 T1557.004 T1562 T1562.006 T1562.010 T1602 T1602.001 T1602.002
NIST 800-53 R4 SC-8 SC-16(1) SC-28(1)
NIST 800-53 R5.2 SC-08 SC-08(01) SC-16(01)
NIST 800-53B R5 (moderate) (source) SC-08 SC-08(01)
NIST 800-53B R5 (high) (source) SC-08 SC-08(01)
NIST 800-82 R3 SC-08 SC-08(01) SC-16(01)
NIST 800-82 R3 MODERATE OT Overlay SC-08 SC-08(01)
NIST 800-82 R3 HIGH OT Overlay SC-08 SC-08(01)
NIST 800-160 Vol2 R1 SC-08(01) SC-16(01)
NIST 800-161 R1 SC-8
NIST 800-161 R1 Flow Down SC-8
NIST 800-161 R1 Level 2 SC-8
NIST 800-161 R1 Level 3 SC-8
NIST 800-171 R2 (source) NFO - SI-1
NIST 800-207 NIST Tenet 2
NIST CSF 2.0 (source) PR.DS-02
NIST Privacy Framework 1.0 PR.AC-P5 PR.DS-P2
OWASP Top 10 2025 A04:2025
SWIFT CSF 2025 2.1 2.5A 2.6
US (15)
EMEA (10)
Framework Mapping Values
EMEA Germany C5 2026 CRY-04.01B CRY-04.01AS PI-01.01B.4
EMEA Spain CCN-STIC 825 op.exp.10 mp.si.2 mp.info.3 mp.info.4 mp.s.2
EMEA Spain Royal Decree 311 2022 Article 12(6)(j)
EMEA EU DORA RTS 2024 Article 14.1 Article 14.1(a) Article 35.1(d)
EMEA UK CAF 4.0 B3.b
EMEA UK DEFSTAN 05-138 2024 2302
EMEA UK DEFSTAN 05-138 - L2 2024 2302
EMEA UK DEFSTAN 05-138 - L3 2024 2302
EMEA Saudi Arabia IoT CGIoT-1 2024 2-4-1 2-4-2 2-4-3 2-6-2
EMEA Saudi Arabia CSCC-1 2019 2-3-1-5 2-7-1-1
APAC (6)
Framework Mapping Values
APAC Australia CCM 2026 PRO-08
APAC Australia ISM June 2026 ISM-0677
APAC Japan ISMAP 14.2.5.8
APAC Malaysia RMiT 2025 A7-D2(b)(i) A7-D2(d)
APAC New Zealand NZISM 3.9 17.1.57.C.01
APAC Singapore CCOP CII 2026 5.7.2(d)

Capability Maturity Model

Level 0 — Not Performed

Practices are non-existent, based on the inability to demonstrate an implemented and operational capability. A reasonable person would conclude the control is not being performed.

Level 1 — Performed Informally

Cryptographic Protections (CRY) domain capabilities are ad hoc and inconsistent. Capability criteria associated with this control may include: ▪ Policies, standards & procedures associated with CRY domain capabilities provide limited coverage due to the depth and breadth of the existing documentation. ▪ Cryptography management-related activities are decentralized (e.g., a localized/regionalized function) and uses non-standardized methods to implement secure, resilient and compliant practices. ▪ IT and/or cybersecurity personnel provide an encryption solution (software or hardware) for the storage of sensitive/regulated data.

Level 2 — Planned & Tracked

Cryptographic Protections (CRY) capabilities are requirements-driven, but are not standardized across the entity (e.g., local/regional level consistency). Capability criteria associated with this control reasonably expect the following criteria to exist: ▪ Policies and standards associated with CRY domain capabilities are formally documented and centrally-managed by the entity. ▪ Standardized Operating Procedures (SOP) associated with CRY domain capabilities are documented and maintained by process owners. ▪ IT and/or cybersecurity personnel work with business stakeholders and process owners to appropriately scope and reasonably implement cybersecurity and data protection controls associated with CRY domain capabilities to address applicable statutory, regulatory and/or contractual requirements for Technology Assets, Applications, Services and/or Data (TAASD). ▪ Cryptographic management controls-related controls are primarily administrative and preventative in nature (e.g., policies, standards and procedures & guidelines). ▪ Cryptographic management may be a defined function (e.g., team or department) or assigned as an additional duty to existing IT and/or cybersecurity personnel. ▪ Technology Assets, Applications and/or Services (TAAS) that store, process or transmit sensitive/regulated data use cryptographic mechanisms to prevent unauthorized disclosure of information as an alternate to physical safeguards. ▪ External compliance requirements for cryptography are identified and documented, based on applicable laws, regulations and contractual obligations. ▪ IT and/or cybersecurity personnel work with business stakeholders and process owners to implement cryptographic mechanisms that are applicability for statutory, regulatory and/or contractual compliance obligations. ▪ Sensitive/regulated data is encrypted at rest using cryptographic protections that are commensurate with the sensitivity of the data.

Level 3 — Well Defined

Cryptographic Protections (CRY) capabilities are standardized across the entity for applicability to People, Processes, Technologies, Data and/or Facilities (PPTDF) to ensure consistency for Technology Assets, Applications, Services and/or Data (TAASD). Capability criteria associated with this control reasonably expect the following criteria to exist: ▪ Policies and standards associated with CRY domain capabilities are formally documented and centrally-managed by the entity's Governance, Risk & Compliance (GRC) team, or similar function. ▪ Standardized Operating Procedures (SOP) associated with CRY domain capabilities are well-documented and kept current by process owners. ▪ A security engineering team, or similar function, is appropriately staffed and supported to implement and maintain CRY domain capabilities. ▪ Technology is leveraged to enhance the efficiency and accuracy of cryptographic protections operations (e.g., PKI management tool). ▪ The entity's Governance, Risk & Compliance (GRC) team, or similar function, works with business stakeholders and process owners to appropriately scope and reasonably implement cybersecurity and data protection controls associated with CRY domain capabilities to address Minimum Compliance Requirements (MCR) (e.g., applicable statutory, regulatory and/or contractual requirements) and Discretionary Security Requirements (DSR) (e.g., entity-required controls). ▪ An implemented and operational cryptographic capability exists to protect the integrity of data being transmitted.

Level 4 — Quantitatively Controlled

Cryptographic Protections (CRY) capabilities, in addition to being standardized across the entity and centrally managed to ensure consistency across Technology Assets, Applications, Services and/or Data (TAASD), efforts are metrics driven to provide sufficient insight for decision makers to predict optimal performance, ensure continued operations and/or identify areas for improvement. Capability criteria associated with this control reasonably expect the following criteria to exist: ▪ Applicable SCR-CMM Level 3 (Well Defined) capabilities are implemented and operational. ▪ Metrics reporting includes quantitative analysis of Key Performance Indicators (KPIs). ▪ Metrics reporting includes quantitative analysis of Key Risk Indicators (KRIs). ▪ Scope of metrics, KPIs and KRIs covers organization-wide cybersecurity and data protection controls, including functions performed by third-parties. ▪ Organizational leadership maintains a formal process to objectively review and respond to metrics, KPIs and KRIs (e.g., monthly or quarterly review). ▪ Based on metrics analysis, process improvement recommendations are submitted for review and are handled in accordance with change control processes. ▪ Business and technical stakeholders are involved in reviewing and approving proposed changes to evolve capabilities.

Level 5 — Continuously Improving

Utilize SCR-CMM Level 3 or Level 4 (if available) criteria definitions: ▪ There are no defined Level 5 criteria, since it is reasonable to assume a continuously-improving process is not necessary to operationalize this control. ▪ Level 5 capabilities should be considered “world-class” where the control builds on Level 4 capabilities, but are continuously improving through Artificial Intelligence (AI) and/or Machine Learning (ML) technologies. ▪ While it may be possible to develop responsive capabilities for this control through the use of AI and/or ML technologies, the criteria would be organization-specific to define.

Assessment Objectives

  1. CRY-06_A01 cryptographic mechanisms are implemented to detect unauthorized changes to data in transit.
  2. CRY-06_A02 cryptographic uses are defined.
  3. CRY-06_A03 information requiring cryptographic protection is defined.
  4. CRY-06_A04 system components or media requiring cryptographic protection is/are defined.
  5. CRY-06_A05 types of cryptography for each specified cryptographic use are defined.
  6. CRY-06_A06 the integrity of transmitted cybersecurity / data privacy attributes is verified.
  7. CRY-06_A07 cryptographic mechanisms are implemented to prevent unauthorized disclosure of information at rest on system components or media.
  8. CRY-06_A08 cryptographic mechanisms are implemented to prevent unauthorized modification of information at rest on system components or media.

Evidence Requirements

E-CRY-01 Cryptographic Protections

Documented evidence of organization-approved cryptographic solutions and modules for both data at rest and in transit.

Cryptographic Protections

Technology Recommendations

Micro/Small

  • TLS for all data in transit (integrity via TLS)

Small

  • Secure Baseline Configurations (SBC)
  • TLS 1.2+ with authenticated cipher suites (AEAD)

Medium

  • Secure Baseline Configurations (SBC)
  • TLS with integrity-protected cipher suites; message signing for sensitive transfers
  • NIST Cryptographic Module Validation Program (CMVP) (https://csrc.nist.gov/projects/cryptographic-module-validation-program)

Large

  • Cryptographic governance program
  • Enforced TLS/IPsec with AEAD cipher suites
  • Digital signatures / HMAC for integrity of critical transfers

Enterprise

  • Enterprise transport integrity standards (TLS 1.3/IPsec with AEAD, message-level signing)
  • Certificate management platform
  • FIPS 140-3 validated modules

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