The invention relates to a security device and an authentication method, in which a security element (1) is provided. The security element comprises a support material (6), in which a three-dimensional pattern with structures (4) such as cracks, grooves, flaking, pits, scales, elevations, and/or shrinkages are embedded as static or dynamic security features. Additionally, a material, which is detectable by a scanning device, or a material composition is deposited or incorporated at least partly onto or into the three-dimensional pattern embedded in the support material (6) and is, if necessary, new applicable onto or removable from the security element, whereby the color, intensity, structure, layer thickness, individual pigments or another physical property of the support material (6) and/or the three-dimensional security element (1) pattern embedded into the support material is changed such that an at least partly altered appearance is produced which is detectable by the scanning device at authentication point of time and is storable in the storage device.