University of Shanghai for Science and Technology
It's an evidence how huge is the impacts of technological progress and inventions on nowadays market places and life. Computers and mainly Personal Computers have transformed the human behavior, capabilities of data processing and computing. The nineteenth have been clearly marked by the democratization of the large and wide area networks and mainly the Internet technologies. Among all those progress, security requirements and sensitivity have increased and shifted from a mainly physical protection to data protection and data access control then gradually to mainly communication protection and distant application management and finally e-processing of crucial data through a wide set of applications in what is nowadays called the 'Cloud'.