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CRY-03.2: Pre/Post Transmission Handling

CRY 5 — Medium Protect

Cryptographic mechanisms exist to ensure the confidentiality and integrity of information during preparation for transmission and during reception.

Renumbered: Formerly CRY-01.3 in SCF 2025.4.

Control Question: Are cryptographic mechanisms utilized to ensure the confidentiality and integrity of information during preparation for transmission and during reception?

General (3)
Framework Mapping Values
NIST 800-53 R4 SC-8(2)
NIST 800-53 R5.2 SC-08(02)
NIST 800-82 R3 SC-08(02)
US (1)
Framework Mapping Values
USA Federal CMS MARS-E 2.0 SC-8(2)
APAC (2)
Framework Mapping Values
APAC Australia ISM June 2026 ISM-0548 ISM-0554
APAC India RBI Digital Payments 2021 67.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

SCR-CMM Level 1 criteria definitions are not available for this control: ▪ A reasonable person would conclude this control requires a structured process. ▪ At this level of maturity, the "ad hoc" nature of performing a capability informally would indicate the intent of the control is not met due to a lack of consistency and formality.

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.

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 ensure the confidentiality and integrity of information during preparation for transmission and during reception.

Level 4 — Quantitatively Controlled

Utilize SCR-CMM Level 3 criteria definitions: ▪ There are no defined Level 4 criteria, since it is reasonable to assume a quantitatively-controlled process is not necessary to operationalize this control. ▪ While it may be possible to develop “metrics-driven” capabilities for this control, the criteria would be organization-specific to define.

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-03.2_A01 the confidentiality and integrity of information is maintained during preparation for transmission.
  2. CRY-03.2_A02 the confidentiality and integrity of information is maintained during reception.

Technology Recommendations

Micro/Small

  • Use TLS for all transmissions; keep files encrypted until sent

Small

  • Secure Baseline Configurations (SBC)
  • TLS enforced end to end; secure staging of data before transmission

Medium

  • Secure Baseline Configurations (SBC)
  • Cryptographic governance program
  • Application-layer encryption for sensitive data prior to transmission

Large

  • Cryptographic governance program
  • End-to-end encryption standards covering preparation, transmission and reception
  • Secure file transfer platforms (e.g., managed file transfer)

Enterprise

  • Enterprise cryptographic standards covering pre/post transmission handling (end-to-end encryption, secure staging areas)
  • Managed File Transfer (MFT) platforms
  • HSM-backed key management

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