Techniques for detecting and responding to attacks on computer and network systems including denial-of-service attacks. More particularly, the invention relates to such a foodstuff that comprises a toroidal shaped filling and a flour based casing that fully envelops said toroidal shaped filling, wherein the ratio between the internal diameter and the external diameter of the toroidal shaped filling is within range of 1:3 and 1:1. Each photosensor is positioned to receive light emitted from a second end of one of the light guides. The device also includes the subsidiary flexible removable vacuum chamber wherein the blank from sheet material is placed in contact with the shaping system of dies. The detected output levels are compared with a predetermined value to detect an error due to the attachment position of the optical device.