🔏Non-repudiation

NEW

Assurance that a party cannot deny the authenticity of their signature, message, or action.

DESCRIPTION

Non-repudiation ensures that an entity cannot credibly deny sending a message or performing an action. Digital signatures, PKI, timestamps, and audit trails provide evidence. It is vital for legal compliance, financial transactions, and incident investigations. Robust logging and secure key management underpin its effectiveness. Weak controls risk disputes and regulatory non-compliance.

ALTERNATIVE DEFINITIONS

Wikipedia

Non-repudiation is the assurance that someone cannot deny the validity of something.

Concise assurance-focused definition.

Source

NIST CSRC

Protection against an individual falsely denying having performed a particular action.

Frames non-repudiation as protective control against denial.

Source

OWASP

Non-repudiation ensures actions or events can be proven to have occurred, preventing participants from denying their involvement.

Highlights practical control implementation in applications.

Source

RELATED TERMS

Digital Signature Public Key Infrastructure Transaction Audit Data Message Integrity Authentication Authorization Chain of Custody Logging TLS Compliance Management

COMPETING TERMS

Repudiation

KNOWLEDGE AREAS

Data Security Data Privacy & Compliance Data Governance

TARGET AUDIENCE

Security Architect Cybersecurity Engineer Chief Information Security Officer IT Auditor Data Privacy Officer IT Manager

EXTERNAL SOURCES

• Wikipedia - Non-repudiation
• NIST CSRC - Official glossary definition
• OWASP - Application security control overview
• ISO/IEC 27000 - Terminology reference

TOP QUESTIONS

How is Non-repudiation achieved in practice?

Through digital signatures, PKI, trusted timestamps, and immutable logs. Procedures ensure chain of custody for evidence.

Category: HowTo

What is the role of PKI in Non-repudiation?

PKI provides certificates and key management, enabling verifiable signatures and identity binding.

Category: Relationship

What are the risks if Non-repudiation is weak?

Disputes over transactions, regulatory penalties, and inability to investigate incidents effectively.

Category: Risks

How do audit trails support Non-repudiation?

Comprehensive, tamper-evident logs correlate actions with identities and timestamps, strengthening evidence.

Category: Management

Is Non-repudiation only technical?

No. Legal agreements, processes, and governance complement technical controls to ensure enforceability.

Category: Opinion

Where is Non-repudiation critical?

Financial transactions, e-signatures, healthcare records, and supply chain traceability.

Category: Example

How does Non-repudiation relate to integrity and authentication?

Non-repudiation builds on integrity and authentication to provide proof of action or origin.

Category: Relationship

What standards reference Non-repudiation?

ISO/IEC 27000 family, NIST publications, and OWASP controls reference its implementation.

Category: Overview

Can blockchain provide Non-repudiation?

Blockchain’s immutability and distributed consensus can strengthen non-repudiation for recorded events.

Category: Topic