Clear Abstractions
LOW MODERATE HIGHRequirements NIST SOURCE
Implement the security design principle of clear abstractions.
Discussion (NIST Supplemental Guidance)
The principle of clear abstractions states that a system has simple, well-defined interfaces and functions that provide a consistent and intuitive view of the data and how the data is managed. The clarity, simplicity, necessity, and sufficiency of the system interfaces— combined with a precise definition of their functional behavior—promotes ease of analysis, inspection, and testing as well as the correct and secure use of the system. The clarity of an abstraction is subjective. Examples that reflect the application of this principle include avoidance of redundant, unused interfaces; information hiding; and avoidance of semantic overloading of interfaces or their parameters. Information hiding (i.e., representation-independent programming), is a design discipline used to ensure that the internal representation of information in one system component is not visible to another system component invoking or calling the first component, such that the published abstraction is not influenced by how the data may be managed internally.
Implementation Guidance
Original engineering commentary written for this explorer — not NIST source text and not authoritative guidance.
No engineering interpretation has been authored for SA-8(1) yet. This section is architected to receive it — see the Requirements and Assessment sections above for the authoritative NIST source content in the meantime.
Assessment
Assessment Objectives
- the security design principle of clear abstractions is implemented.
Examine
[SELECT FROM: System and services acquisition policy; procedures addressing the security design principle of clear abstractions used in the specification, design, development, implementation, and modification of the system; system design documentation; security and privacy requirements and specifications for the system; system security and privacy architecture; system security plan; other relevant documents or records].
Interview
[SELECT FROM: Organizational personnel with the responsibility for determining system security and privacy requirements; organizational personnel with system specification, design, development, implementation, and modification responsibilities; system developers; organizational personnel with information security responsibilities].
Test
[SELECT FROM: Organizational processes for applying the security design principle of clear abstractions to system specification, design, development, implementation, and modification; mechanisms supporting the application of the security design principle of clear abstractions to system specification, design, development, implementation, and modification].
Overlays
STIGs & CCIs
No STIG checks or CCI mappings are currently loaded for SA-8(1). This section is architected to display, per product: STIG ID, Finding ID, Severity, Title, Description, Check, Fix, CCI, and NIST control mapping — but nothing is populated here until a real DISA STIG/CCI dataset is ingested.
Learn more about STIG/CCI integration →Evidence
Categorized from the SP 800-53A "Examine"/"Test" artifact list above by keyword — not an authoritative NIST evidence list.
Policy
- System and services acquisition policy
- system security plan
Configuration
- system design documentation
- system security and privacy architecture
Testing
- Organizational processes for applying the security design principle of clear abstractions to system specification, design, development, implementation, and modification
- mechanisms supporting the application of the security design principle of clear abstractions to system specification, design, development, implementation, and modification
Other Records
- procedures addressing the security design principle of clear abstractions used in the specification, design, development, implementation, and modification of the system
- security and privacy requirements and specifications for the system
- other relevant documents or records