top of page
D10S_hero_bkgd_v1_2026.png

D04

Application Security Architecture

D04-cover-image2.png
About The Standard Domain 

The Application Security Architecture domain defines how applications, APIs, components, and services are designed and built to withstand threats and protect data, functionality, and user trust.

​

It provides unified expectations for secure design, interface protection, runtime controls, and resilience to support confidentiality, integrity, availability, and safe operation of software systems.

Secure Application Design

API & Interface Protection

Secure Components

Runtime & Session Control

Resilience & Assurance

Why Adoption is Necessary

Architectural Clarity

 

Provides a shared blueprint for secure application structure, components, interfaces, and interactions.

​

Consistent Engineering Expectations

Aligns teams on secure design principles for APIs, services, software components, data flows, and application boundaries.

 

Measurable Verification

​

Defines testable outcomes for security controls across code, APIs, runtime behavior, and application protection mechanisms.

Stronger Evidence 

​

Supports traceability, audit readiness, and defensible evidence with clear design rationale, control coverage, and implementation proof.

How The Standard Works

Requirements

​

Define the security outcomes and capabilities applications must achieve to be secure by design.

​

Technical Specifications

Provide the architectural patterns, interfaces, controls, and design expectations needed to meet the requirements.

Verification and Validation

Define how to test, verify, and validate application security controls, behaviors, and protections.

Implementation Guidance

Offer practical guidance, patterns, and best practices to implement secure applications effectively.

​

Associate Standards Preview

Associate Standards Coming in Q3 2026 

Detailed, implementation-level standards that support D01 will be published in Q3 2026 to help teams operationalize secure network architectures.

D10S_ISAU_shield_logo_v2_2026_transp.png
Built for Builders. Backed by Evidence.

D04 provides the architectural foundation for secure applications, APIs, components, and services, designed, engineered, and proven to protect software functionality, data flows, and user trust.

Governance by:

ISAUnited-red_trimmed.png

Training by:

  • LinkedIn

Practitioner and Organizational Use

The Defensible 10 Standards (D10S) are published under a Creative Commons Attribution–NonCommercial 4.0 International License (CC BY-NC 4.0).


This license permits free use, adaptation, and internal implementation of the D10S by individual practitioners, educational institutions, and organizations for the purpose of research, training, architecture design, or internal security engineering.


Attribution to ISAUnited.org must be maintained in all uses, reproductions, or derivative works.

Commercial, Vendor, and Integration Use

The use, reproduction, or incorporation of the Defensible 10 Standards (D10S) or their content within commercial products, software, tooling, managed services, or for-profit offerings requires a separate commercial integration or redistribution license issued by the Institute of Security Architecture United (ISAUnited.org).


This includes but is not limited to:

  • Integration into commercial or subscription-based platforms or software tools

  • Use in vendor-branded frameworks or automated compliance products

  • Redistribution of modified or adapted versions for resale or commercial benefit

 

Requests for commercial licensing or integration agreements should be directed to:  info@isaunited.org

© 2026 The Defensible 10 Standards (D10S). Owned, operated, and maintained by the Institute of Security Architecture United (ISAUnited.org).

bottom of page