With the advent of new technologies and software, software industry is becoming more competitive. The users are pressurizing software developers to deploy a fully secured system. Increasing requirements of software security often leads to the development of many successive versions of software. Software products are growing more sophisticated, the writing of latest versions has become complex and time consuming activity. For software security reasons it is necessary to understand the nature of security and the best way to do it is to identify new security factors and analyze them.