Abstract: A security keyboard is disclosed with a contacting circuit board, a plurality of keys and a switching foil, where the contacting circuit board comprises contact elements necessary for the security keyboard and which is substantially completely enveloped in a security film and in operating the plurality of keys the keyboard pressure is transmitted through the security film to the contacts of the contacting circuit board. In accordance with the invention, the plurality of keys are held in the switching foil in such a way that on operating the plurality of keys a tactile feedback is produced. This permits a positive switching of the security keyboard since, because of the tactile feedback, an `automatic` backpressure of the keys results through a force inflection point, after which an operating force necessary for the operation of the keys, increases again as a consequence, in part, of the security film lying between the key and the contacting means of the security keyboard.

Abstract: The invention discloses a security foil which covers a security module, wherein the security foil comprises a shielding from electromagnetic radiation from inside and outside. In a preferred embodiment the security foil comprises a metal lattice with defined lattice distances. The lattice distances can be used to change characteristics of the shielding from electromagnetic radiation, in particular the relevant spectra. The invention is especially applicable in electronic payment transactions. The invention permits effective and low-cost shielding of security modules against electromagnetic radiation from inside and outside. Additional time and labor is saved because existing components can be used.