XAdES

XAdES means XML Advanced Electronic Signatures) is a set of extensions to XML-DSig recommendation making it suitable for advanced electronic signatures.''.

XSIG
.XSIG File Extension

''An XSIG file is an XML Signature file used to verify the authenticity of a document. It is saved in the XAdES format, which includes various signature and timestamp properties. XSIG files are primarily used in Europe to digitally sign sensitive documents.''

''You can open XSIG files with AutoFirma, which is a multiplatform desktop application that can sign and validate documents saved in the XAdES format. The application is developed by the Ministry of Finance and Public Administrations of Spain.''

External

 * Spain, Ministerio de Transportes, Movilidad y Agenda Urbana, Autofirma, AutoFirma es una aplicación de escritorio del Ministerio de Hacienda y Función Pública, que le permite realizar la firma electrónica de una solicitud en su propio equipo de manera sencilla, sin utilizar el componente de firma Miniapplet.