Digital Signatures
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Digital Signature
A computerized mark is an electronic, encoded, stamp of verification on computerized data, for example, email messages, macros, or electronic records. A mark affirms that the data began from the underwriter and has not been modified.
Signing certificate
To create a digital signature, you need a signing certificate, which proves identity. When you send a digitally-signed macro or document, you also send your certificate and public key. Certificates are issued by a certification authority, and like a driver’s license, can be revoked. A certificate is usually valid for a year, after which, the signer must renew, or get a new, signing certificate to establish identity.
Digital Signature Assurances
The following terms and definitions show what assurances are provided by digital signatures.
Authenticity The signer is confirmed as the signer.
Integrity The content has not been changed or tampered with since it was digitally signed.
Non-repudiation Proves to all parties the origin of the signed content. Repudiation refers to the act of a signer denying any association with the signed content.
Notarization Signatures in Microsoft Word, Microsoft Excel, or Microsoft PowerPoint files, which are time stamped
