Non-repudiation
What is Non-repudiation?
Non-repudiation is the security property that provides credible proof that a specific action, transaction, or communication was performed by a particular party so that party cannot later deny it convincingly.
Examples
- A digitally signed contract provides evidence that the signer approved the document and cannot easily deny that action later.
- A user submits a transaction through a system that records strong identity, time, and signature data to support accountability.
Discover 🔎
Security is not only about stopping people from doing the wrong thing. It is also about being able to prove what happened after the fact. If a person approves a payment, signs a contract, or sends a critical instruction, the organization may need evidence that the action really came from that person and was not forged or denied later.
That is the role of non-repudiation. It supports accountability by making actions harder to deny convincingly once they have been performed. This matters most in environments where transactions, approvals, legal commitments, and sensitive communications need dependable proof.
Summary 📝
Non-repudiation provides evidence that a specific action or communication came from a specific party and was not changed afterward without detection. It is especially important where approvals, legal commitments, and sensitive transactions must remain accountable. In practice, it relies on strong identity, protected records, trusted timing, and mechanisms such as digital signatures.
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