Glossary
Advanced Electronic Signature (AES)
The middle tier of electronic signature under eIDAS. An AES is uniquely linked to the signatory, capable of identifying them, and linked to the data so any change is detectable.
AES sits between Simple Electronic Signatures (SES) and Qualified Electronic Signatures (QES) in the eIDAS hierarchy. It requires: unique linkage to the signatory, ability to identify the signatory, creation under the signatory's sole control, and attachment to the data in a way that detects any subsequent change.
AES provides stronger legal standing than SES but does not automatically equal a handwritten signature like QES does.
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