Rapid progress in science and technology has brought great convenience for business and personal life alike. In particular, evolutionary advancements in nanoscale semiconductor technology , while improving performance, are key contributors to the miniaturization of electronic products. These improvements, in turn, have introduced consumers to personal computing and the information era. Lately, consumer products for mobile computing and communication have been the fastest growing segments to drive the semiconductor industry. These new products further incorporate wireless, Internet, and revolutionary social network applications, allowing interpersonal communication without restrictions of time and place. However, these new products and services have created various privacy and security concerns. Although communicating with people whom one has never met is already common in a person’s virtual life, it may result in a breach of privacy as well as in virus attacks to the personal system. Therefore, developing high-security products and services is an urgent task not only for business, but also for the semiconductor industry.