The reusable, portable toilet seat has a planform congruent with a conventional toilet seat and includes a base of corrugated sheet material with a sheet of air-filled plastic wrap thereover and a layer of non-woven batting overlying the air-filled material. The device is a rectangular block having three threaded fixation pins. A cryptographic unit generatesstores an asymmetric cryptographic publicprivate key pair associated with each authorized BCU user. Additionally, any data transformations on the chunks are performed subsequent to identification of the data chunks. The hole pixel may be restored by searching for a source patch most similar to a background of the target patch, and copying a pixel in the found source patch into a hole pixel of the target patch. The contact may optionally be effectuated by temporarily altering the relative dimensions of the metallic ring and the transparent component, placing the transparent component into the inner space of the metallic ring, and then reversing the altered relative dimensions of the metallic ring and the transparent component.