The eIDAS rules are a set of regulations that govern the use of electronic identification and trust services across the European Union. The rules are designed to ensure the secure and reliable exchange of digital information between EU member states.

One of the key components of the eIDAS rules is the advanced signature level. The advanced signature level is a set of requirements that must be met in order to create a legally binding digital signature. This signature is used to authenticate the identity of the signer and to ensure that the document has not been tampered with.

The advanced signature level requires that the signature be created using a qualified electronic signature (QES) or an advanced electronic signature (AES). QES and AES are both digital signatures that are created using cryptographic techniques. QES is the most secure type of digital signature and is used for documents that require a high level of security. AES is less secure than QES but is still considered to be a secure form of digital signature.

The advanced signature level also requires that the signature be created using a qualified certificate. This certificate is issued by a qualified trust service provider and is used to verify the identity of the signer. The certificate must also be issued by a trusted third party, such as a government agency or a bank. The advanced signature level is an important part of the eIDAS rules and is designed to ensure that digital signatures are secure and reliable.

By meeting the requirements of the advanced signature level, organizations can ensure that their digital signatures are legally binding and can be trusted.