A method of enabling selection of one or more pieces of secret information stored in a first entity, the first entity also storing at last one value indicative of at least one attribute for each of the one or more pieces of secret information, the method comprising the steps of: (a) receiving at the first entity a request from a second entity for one or more of the values for one or more of the pieces of secret information stored in the first entity; and (b) in response to the request, outputting the values to the second entity.