What is an Advanced Electronic Signature?

An advanced electronic signature is a digital signature based on an advanced certificate uniquely identifying the signer. The signature keys are used with a high level of confidence by the signatory (who has sole control of the signing key).

Under eIDAS, an electronic signature is considered to be advanced if it has met several requirements, including:

- It uniquely identifies and links its signatory
- The private key used to create the electronic signature is under the sole control of the signatory
- If the data is tampered with after the message has been signed, the signature must identify that this has happened
- Invalidating the signature in the event its accompanying data has changed.

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