A semiconductor structure and method for forming the same. The discrete antennas and the distributed antenna define a plurality of detection zones. The fluoresced x-rays are detected with an x-ray detector, and the piece of material is classified from the detected fluoresced x-rays. Check bits U are obtained by encrypting pixel data by exclusively ORing respective bits, except for the LSBs, of B pixel data at positions of the image I\u2032 and the pseudo random numbers. The second variation obfuscates data in a process.