A first and second apparatuses, first and second computer programs and first and second methods are provided. The first apparatus comprises: an interface; and a secure processor configured to control the interface to provide a request, to the second apparatus, requesting information from one or more sensors of the second apparatus. The request may be a data structure comprising an element having one of a multiplicity of predetermined configurations, each configuration identifying at least one of a plurality of sensors. The second apparatus comprises: a further interface; one or more sensors; and a processor configured to receive via the further interface the request, from the secure processor of first apparatus, requesting information from at least one sensor identified in the request. The processor is configured to process the request, to determine whether the second apparatus comprises the at least one sensor identified in the request.