A Digital Signature is a value computed with a cryptographic process using a private key and then appended to a data object, thereby digitally signing the data. This is essentially a scheme that verifies the authenticity of the documents.
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Related Term: Authenticity, Electronic Signature, Non-Repudiation, Integrity
Source: CNSSI 4009, IETF RFC 2828, ICAM SAML 2.0 WB SSO Profile 1.0.2, InCommon Glossary, NIST SP 800-63 Rev 1