Abstract: A processor of an encryption device obtains a graphical 3D object having a plurality of points, each point being defined by at least three coordinate values, generates a mask, applies the mask, using an operator, to at least selected points of the plurality of points to obtain an encrypted graphical 3D object and outputs the encrypted graphical 3D object. The mask is applied separately to the coordinate values or wherein the mask is applied to the at least three coordinate values together and separately to each selected point. In an embodiment, the processor applies the mask digit wise so that each input digit results in an output digit. The processor can also perform at least one of scaling and translation on the graphical 3D object before applying the mask. Decryption of an encrypted graphical 3D object is an essentially reverse procedure.