What is the main function of XML Signature?

The primary function of XML Signature is to ensure authentication and message integrity. XML Signature provides a mechanism for signers to create a digital signature for an XML document, which serves two critical purposes: it verifies the identity of the signer (authentication) and ensures that the content of the message has not been altered during transmission (message integrity).

By using cryptography, XML Signature encodes a hash of the message along with the signer's private key, producing a signature that can be verified by anyone who has access to the signer's public key. This confirms that the message originates from the claimed sender and has not been tampered with since it was signed.

The other options relate to functions that are not within the primary scope of XML Signature. For instance, creating user accounts and managing user roles pertain to identity management rather than data integrity techniques like digital signatures. Generating report logs is more aligned with auditing or monitoring activities, which also do not directly tie to the function of XML Signature.