Nonrepudiation in computer security refers to the set of mechanisms, assurances, and cryptographic guarantees that prevent an individual or system from denying that a specific action, communication, or transaction took place.

It ensures that when a message is sent, a file is signed, or a transaction is executed, there is irrefutable evidence linking that action to the originating party, making later denial impossible without contradicting verifiable cryptographic proof.

Nonrepudiation typically relies on digital signatures, secure logging, trusted timestamps, and public‑key infrastructures, all of which work together to create a chain of evidence demonstrating authenticity, integrity, and authorship.

In practice, nonrepudiation is essential for environments where accountability is critical—such as financial systems, distributed computing, and legal or contractual exchanges—because it establishes a trustworthy record of events that can withstand disputes, audits, or forensic analysis.

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