A method of generating an unpredictable number in a computing device is provided. The nickel powders are non-magnetic and have a HCP crystal structure. To avoid negative stress on the transistors, the transistors are alternately driven to an \u201coff\u201d state so that no one transistor sees a long \u201coff\u201d time. The PSF and message are demodulated from each of the sampled light packets. A system clock frequency may be one of the frequencies used. The dry etching process is conducted by an etching gas containing at least one gas species selected from the group consisting of: HBr, HCl, Cl2, Br2 and HI, wherein the dry etching process includes a first step conducted at a first temperature; and a second step conducted at a second temperature.