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Also known as: Separation of Duties
A security control separating responsibilities to reduce fraud and error risk.
DESCRIPTION
Segregation of duties divides critical tasks among multiple roles to prevent abuse and mistakes. It reduces the likelihood of unauthorized actions without collusion and improves auditability. Implemented through role design, approval workflows, and access controls, it is central to internal controls frameworks. Industries apply SoD in financial processes, deployments, and data changes. SoD complements least privilege and dual control.
ALTERNATIVE DEFINITIONS
NIST Glossary
A security principle where critical functions are divided among different individuals to reduce risk of malevolent activity without collusion.
Emphasizes reducing malevolent activity risk by dividing functions.
NIST SP 800-53 AC-5
Employ separation of duties for duties that, if performed by one individual, may pose a risk of fraud, waste, and abuse.
Links SoD to fraud, waste, abuse risk mitigation requirements.
ISACA
Separation of duties is the assignment of different parts of a process to different people to prevent errors and fraud.
Frames SoD in internal controls to prevent errors and fraud.
RELATED TERMS
Least Privilege Dual Control Access Control RBAC Privileged Access Management Change Management Transaction Audit Data Internal Controls Compliance Policy
COMPETING TERMS
Concentration of Duties
KNOWLEDGE AREAS
Data Security Data Governance Data Management Data Privacy & Compliance
TARGET AUDIENCE
Chief Information Security Officer Security Architect IT Auditor IT Manager Data Governance Manager Data Privacy Officer
EXTERNAL SOURCES
- Wikipedia - Separation of duties
- NIST - Control AC-5: Separation of duties
- ISACA - Internal controls guidance on SoD
- PCI Security Standards Council - PCI DSS resources on role segregation
TOP QUESTIONS
Why is Segregation of Duties important?
It prevents single-person control over critical actions, reducing fraud and errors.
Category: Relevancy
What mistakes undermine Segregation of Duties?
Excessive privileged roles, weak approval workflows, and undocumented exceptions degrade SoD effectiveness.
Category: Mistakes
How is Segregation of Duties implemented?
Define roles, separate approvals from execution, and enforce via RBAC and audit trails.
Category: Requirements
What risks arise without Segregation of Duties?
Elevated fraud risk, undetected errors, and non-compliance with control frameworks.
Category: Risk
How does SoD relate to Least Privilege?
Least privilege limits access; SoD splits critical tasks. Both prevent abuse together.
Category: Opinion
How should SoD exceptions be managed?
Document, time-bound, and approve exceptions; add compensating controls and post-event reviews.
Category: Management
What hot topics affect SoD today?
Automated entitlement reviews, just-in-time access, and continuous controls monitoring.
Category: Topic
Where to start establishing SoD?
Catalog critical processes, identify conflict pairs, and design role matrices with approval steps.
Category: Example
How to test SoD effectiveness?
Run control audits, simulate conflicted role assignments, and review change logs for unauthorized combinations.
Category: Testing