A method and system for supply of data relating to a described entity (302) to a relying entity (304), which includes the generation of a first digital certificate referred to as an empowerment certificate signed by a first signing entity. The empowerment certificate includes attributes of the described entity (302) information and identifying the first signing entity. It 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 said data. The empowerment certificate also includes identification of relying entities (304) to which the data can be supplied. The relying entity (304) forwards the empowerment certificate to source (306) supplying the data indicated in the empowerment certificate. Some or all of the data relating to the described entity (302) may be supplied by means of a second digital certificate referred to as a custom certificate, signed by a second signing entity. Custom certificates may appear in custom certificate revocation lists. A system and method for transfer of ownership of electronic property (801) from a first entity to a second entity are also provided. A method and system for electronic voting are also provided.