Overview
ISO/IEC 27043:2015 - Information technology - Security techniques - Incident investigation principles and processes provides high-level guidelines and idealized models for digital incident investigations. The standard covers the full lifecycle of an investigation - from pre-incident readiness through detection, acquisition, analysis, interpretation, reporting and closure - and offers principles to ensure investigations are repeatable, transparent, and legally defensible. ISO/IEC 27043 is intended as an overarching framework that complements more detailed standards for specific forensic techniques.
Key topics and requirements
- Investigation process model: A harmonized, top-down model dividing processes into classes such as readiness, initialization, acquisitive, investigative and concurrent processes.
- Pre-incident readiness: Guidance for scenario definition, identifying potential digital evidence sources, planning collection and storage, and designing detection and system architecture.
- Acquisition and preservation: Principles for potential digital evidence identification, collection, acquisition, transportation, storage and long-term preservation.
- Examination, analysis and interpretation: High-level requirements to support repeatability and transparency of analysis so similarly skilled investigators can reach consistent results.
- Documentation and chain of custody: Emphasis on robust documentation, authorization, managing information flow and preserving chain of custody to maintain evidential value.
- Legal and ethical considerations: General legal principles and caveats; alignment of investigative methods with applicable laws, policies and jurisdictional requirements.
- Competence and validation: Investigators must be competent, use validated processes (see ISO/IEC 27041) and take responsibility for assigned processes.
Practical applications
- Establishing an organizational incident investigation framework that is consistent and defensible in court or regulatory review.
- Guiding incident response teams and digital forensic practitioners on process sequencing and responsibilities.
- Supporting policy-makers and legal decision‑makers to evaluate the reliability of digital evidence and investigation procedures.
- Informing procurement and deployment of logging, detection, storage and forensic-ready system architectures for faster, higher-quality investigations.
Who should use this standard
- Digital forensic practitioners and incident responders
- Security operations center (SOC) teams and IT managers
- Legal, compliance and evidence-handling officers
- Policy-makers, auditors and accreditation bodies
- Organizations preparing forensic-ready systems or standard operating procedures
Related standards
- ISO/IEC 27041 (investigative methods validation) and other standards in the ISO/IEC security techniques family provide detailed, complementary guidance.
Keywords: ISO/IEC 27043, incident investigation, digital evidence, incident response, chain of custody, digital forensics, investigation processes, forensic readiness.