Abstract: A method and system for supply of data relating to a described entity (302) to a relying entity (304). The method includes generating a first digital certificate referred to as an empowerment certificate signed with an electronic signature by a first signing entity. The empowerment certificate includes one or more attributes of the described entity (302) and one or more attributes of the empowerment certificate including one or more attributes identifying the first signing entity. The empowerment certificate also includes an indication of data relating to the described entity (302) which is to be supplied and an indication of one or more sources (306) for the data to be supplied. The empowerment certificate also includes one or more attributes identifying one or more relying entities (304) to which the data is authorised to be supplied.