Which security concept prevents users from denying their actions in a system? Learn how non-repudiation works through digital signatures and audit logs—essential for the Cisco Certified Support Technician (CCST) Cybersecurity 100-160 exam.
Table of Contents
Question
What security concept ensures that users cannot deny their actions within a system?
A. Encryption
B. Authentication
C. Non-repudiation
D. Availability
E. Confidentiality
Answer
C. Non-repudiation
Explanation
Non-repudiation ensures that actions are recorded and cannot be denied later.
The security concept that ensures users cannot deny their actions within a system is non-repudiation.
Non-repudiation provides proof that a specific action or communication was performed by a particular user, preventing that user from later denying their involvement.
This is achieved using cryptographic methods such as digital signatures, secure audit logs, and timestamps, which record and verify user actions in a way that is tamper-evident and legally admissible.
For example, when a user digitally signs a document or transaction, the unique signature (created with their private key) serves as irrefutable evidence that they authorized the action. Audit logs further support non-repudiation by recording who did what and when, making it impossible for users to credibly deny their actions.
Non-repudiation is distinct from authentication (which verifies identity) and integrity (which ensures data isn’t altered). It specifically addresses accountability and traceability, ensuring that actions and communications cannot be denied after the fact.
Non-repudiation ensures that actions are recorded and verifiable, so users cannot later deny their involvement or the authenticity of their actions within a system.
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