A New Approach for Secure and Portable OS

Data security has been an important concern from many years ago and has gained special importance in Information Technology. Since the present computer systems use layered and modular architectures and execute the instructions in a number of different phases, therefore it has become an imperative to establish a trusted chain between various layers. It usually is integrity checking by hashing of executable codes. With guarantee of software integrity, the web servers and other network entities can trust to client systems or workstations. Several methods have been proposed for this purpose, each of them have their own advantages and weakness. This paper is an attempt at evaluation of these methods and proposes a new method called PCSM which tries to overcome the weaknesses of previous systems. This method is more flexible and transparent and with the proposed architecture can prevent many attacks and therefore provides higher level of security. This paper is concluded with a comparison between the proposed method and other methods.