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SESK: Stuff Everyone Should Know · sesk.info/secplus-nonrepudiation-signature

Which assurance does a digital signature add so a signer cannot later deny signing?

Non-repudiation, proof of who signed and that the data was not altered.

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  1. Non-repudiation ✔
  2. Obfuscation
  3. Redundancy

Why: A digital signature is made with the signer's private key. Anyone can verify it with the public key, which ties the data to the signer.

Huh, didn't know that: FIPS 186-5 says a digital signature provides origin authentication, data integrity and signatory non-repudiation.

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Why can't a signer say 'it wasn't me'? The math says it was.
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References

Answer: Non-repudiation. A digital signature is made with the signer's private key. Anyone can verify it with the public key, which ties the data to the signer.

  1. NIST CSRC Glossary: digital signature csrc.nist.gov/glossary/term/digital_signature
    provides a mechanism for verifying origin authentication, data integrity, and signatory non-repudiation
    Checked 2026-10-10.

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