The cryptographic method is used in transactions for which a first entity generates, by use of a private RSA key, a proof verifiable by a second entity by use of a public RSA key associated with said private key. The display device includes: a pixel array unit and a driving unit which drives the pixel array unit. A first fluid consuming electrode and a second electrode are disposed within the cell housing. At least some of the capability deficits andor therapy modules are displayed with their association or on the basis of their association on a computer workstation. If user chooses to, the application is downloaded.