Evaluate signature terminology and match technology to the transaction.
An electronic signature describes an electronic act used with intent to sign. A digital signature is a cryptographic mechanism designed to support authenticity and integrity. A workflow may use both, but the terms answer different questions.
Use the broad and narrow definitions
Electronic signature is the broader category. Depending on context, it can include typing a name, drawing a mark, clicking an agreement control, or applying another electronic process associated with a record and used with signing intent.
Digital signature usually refers to public-key cryptography. A signer uses a private key to create a signature value, and a verifier uses the corresponding public key to check it. NIST describes digital signatures as providing assurance about the claimed signatory and whether information was modified after signature generation.
Map the controls to the questions
| Question | Possible control | Important limit |
|---|---|---|
| Did the person intend to sign? | Clear action, disclosure, confirmation language, event record | A mark alone may not explain context or intent |
| Who had access? | Account, email link, code, identity check | Access evidence is not infallible personal identification |
| Did the file change? | Hash, digital signature, trusted timestamp, controlled version | Integrity does not prove the content was valid or understood |
| Can parties retrieve it? | Completed copy, export, retention and access policy | Platform availability is not a retention strategy by itself |
| Was the process authorized? | Role, authority, consent, transaction policy | Technology does not create authority a person lacks |
Understand certificates
Many digital-signature systems use a certificate that binds a public key to an identity assertion through a certificate authority. Review how identity was verified, who issued the certificate, its validity period and revocation status, where the private key is controlled, and what the relying party trusts.
A PDF viewer’s “valid signature” message generally reports a technical validation under its trust settings. It should not be rewritten as a universal legal conclusion.
Choose by transaction risk
- Low-risk internal acknowledgement: clear identity, intent, version, and retrievable record may be sufficient under the organization’s policy.
- Customer agreement: add delivery, consent, attribution, access, correction, and retention controls appropriate to the transaction.
- High-value or regulated document: obtain legal and security requirements first; stronger identity and cryptographic controls may be appropriate.
- Cross-border workflow: confirm jurisdiction-specific signature types, trust services, and recognition rules rather than assuming U.S. terminology travels.
Ask vendors precise questions
- When you say “digital signature,” which cryptographic standard and certificate model do you use?
- Who controls the private key?
- Which document bytes are signed, and how are later permitted changes shown?
- What identity, consent, intent, and authority evidence is separate from cryptography?
- How can a recipient validate and export the record outside your platform?
- What happens after certificate expiry, revocation, account closure, or long-term retention?
See the audit-trail guide for lifecycle evidence and the PDF preparation guide for field and signer experience.
Sources and further reading
Primary and contextual sources used to verify definitions or give readers a relevant next resource.
- NIST Digital Signatures project Primary technical overview of assurances digital signatures are designed to provide.
- Federal Trade Commission E-SIGN report Primary federal discussion of E-SIGN consumer-consent provisions and electronic records.