A method for fabricating a semiconductor device is provided. A method for controlling a digital television located in one independent space among a plurality of independent spaces physically separated from one another is disclosed. A computer code and a image extraction system are employed to discern and monitor the interference fringes generated from oil slicks. Further, if there are too many pages in the pool, one or more pages may be removed. By eliminating repeatability performed at an algorithmic level, a device inherently lacks one of the fundamental setup assumptions associated with certain classes of side channel, fault injection, timing, and related attacks, thus helps to protect the system against such attacks while preserving the cryptographic security of the system.