A qualified electronic signature certificate is a digital certificate that contains cryptographic keys that are the necessary elements to sign electronically. These certificates have the objective of unequivocally identifying their holder and are issued by Trust Service Providers accredited and supervised by competent bodies. The eIDAS accreditation in the countries of the European Union for the issuance of qualified certificates is based on compliance with ETSI standards EN 319 401, ETSI EN 319 411-1 and ETSI EN 319 411-2.