AES (advanced electronic signature)

The middle signature level defined in Article 26 of eIDAS. An advanced electronic signature must be uniquely linked to the signer, capable of identifying them, created using means under the signer's sole control, and linked to the document so any subsequent change can be detected. In practice the requirements are often met by combining identification (for example MitID) with cryptographic sealing of the document. An AES carries significantly stronger evidential weight than a simple signature and is the standard choice for documents such as employment contracts and data processing agreements.