Digital Certificate
A digital certificate is an electronic credential issued by a Certificate Authority (CA) that cryptographically binds a public key to the identity of its owner, enabling others to verify that a digital signature was created by that specific entity.
What it means
Digital certificates follow the X.509 standard and contain the certificate holder's name, the public key, the CA's digital signature, and an expiration date. When used in document signing, the certificate proves who created the signature and that the signing key has not been compromised. Qualified certificates issued under eIDAS carry the highest legal trust level in the EU.
Why it matters for e-signatures
For regulated industries or high-value contracts, attaching a qualified digital certificate to a signature provides the strongest possible cryptographic proof of signer identity — dramatically reducing the risk of successful repudiation.
Related terms
Frequently asked questions
Do all e-signatures use a digital certificate?
No. Simple electronic signatures (like a typed name or drawn signature) do not use a certificate. Certificate-based signatures are used for advanced and qualified signatures requiring higher assurance.
How long is a digital certificate valid?
Certificates are typically issued with validity periods of 1–3 years. Signatures validated after a certificate expires still hold up if long-term validation (LTV) data was embedded at signing time.
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