Abstract: A method (100) for preventing malicious network traffic is described, the method including: providing (110), by a key generation appliance, a client key to a client device; receiving (120), by a control appliance, a data packet intended for an application server from the client device; determining (130), by the control appliance, whether the data packet includes the client key; forwarding (140) the data packet, by the control appliance, to the application server in response to a determination that the data packet comprises the client key; and/or blocking (150) the data packet, by the control appliance, in response to a determination that the data packet does not include the client key. Further, an apparatus (360) and a system (300) are provided that are configured to perform the method (100).

Abstract: Disclosed herein in a preferred embodiment is a recording material comprising a substrate and a coating comprising at least 3 plies, wherein the outermost ply contains nanoparticles and the inner plies together contain at least one color former, at least one color developer, at least one absorber and at least one solubilizer, and no ply contains both a color former and a color developer. Also disclosed is a process for producing the recording material of the invention and also to a laser marking process wherein the recording material is irradiated with a laser.