An etch resistant liner covering sidewalls of a transistor gate stack and along a portion of the substrate at a base of the transistor gate stack. Cryptographic key distribution systems are generally low in cryptographic-key-generating efficiency, and an improvement in the efficiency is demanded. The seating channel 36 with the decoration 40 installed therein is shielded by a transparent or translucent handle cover 42. The communication channel can be wireless or wired, such as dedicated cabling or using powerline communication.