It is not for this Authority to define the means by which citizens can be identified by electronic means in administrative procedures, nor to determine whether an identification system can reliably guarantee the identity of the applicant. A system of identification of the interested parties that collects together with the data of the DNI or identification document of the interested party his image and voice, can have like legal base the exercise of public powers conferred to the person in charge of the treatment in relation to the functions identification of those interested in the procedure provided for in the administrative procedure regulations. If specific technical means are used that allow the unambiguous identification or authentication of an individual, it will involve the processing of biometric data and therefore special categories of data. In order for this data processing to be lawful and in accordance with data protection regulations, it must have the valid consent of the data subject and comply with the other principles of the RGPD, including the principle of minimization, so that, given the specific circumstances of the procedure or procedures in which it is intended to be applied, it passes the judgment of proportionality.