Method and mobile device to issue digital certificates to electronic devices. The present invention relates to a method and system for issuing a digital certificate from a mobile certification device (10) to an electronic device (11) through a wired point-to-point interface comprising: connecting both devices, generate in the electronic device a pair of asymmetric cryptographic keys and a certificate signing request; send said request to the mobile certification device through the wired interface; verify, by an operator of the mobile certification device, the information included in said request, which is displayed in a graphic interface of the mobile certification device; issue the digital certificate for the electronic device, signed with a private key stored in a secure element of the mobile certification device; and send, to the electronic device, the digital certificate issued and the chain of trust that includes all the certificates of the intermediate certification authorities up to the root certification authority. (Machine-translation by Google Translate, not legally binding)