Meaning
Advanced electronic signature standard that extends the basic XML signature with additional metadata for long-term legal validity. Utilizing xades digital signature ensures that a signed document remains verifiable even after the original certificate has expired. It accomplishes this by embedding the certificate chain and the revocation status directly into the file.
This format is widely adopted in European cross-border trade to meet the requirements of the eIDAS regulation. The standard provides several levels of sophistication, ranging from a basic signature to a full archival format that includes every piece of evidence required for a permanent record. By including these elements, the document becomes self-contained and independent of external verification services.
Longterm Validity
Preservation of the cryptographic evidence occurs through the addition of secure timestamps that prove the document existed at a specific point in time. The xades digital signature includes these markers to prevent the backdating of contracts or invoices. As technology evolves, new timestamps can be added to protect the original signature against the future failure of older encryption algorithms.
Structural Format
Information is stored in a structured XML format that allows for the separation of the signature from the data or its inclusion as a wrapper. This flexibility in xades digital signature allows different industries to adapt the standard to their existing document management systems. It supports the signing of specific parts of a document while leaving other sections open for subsequent updates or comments.
Evidence Preservation
Legal certainty is maintained by keeping all the data necessary for verification in a single, portable file. This means a court or an auditor can confirm the authenticity of a document without needing to access the private databases of the issuer. The standard provides a high level of non-repudiation, which is essential for high-value transactions and long-term industrial partnerships.
