The subject of security in the automatic information system is highly considered as an interesting subject in the view of researchers and workers who are dealing with those systems. The world wide spreads of computers have had direct impact on the development and efficiency of automatic information system. But still there is a continuous fear towards the security aspects and possibility of dependency of computers in directing and handling the automatic systems in permanent image and minute, and its ability to protect secrets and privacy from assault and snooping. The main objective of this paper is the exposure to gaps of coding systems with focus on classical encryption methods , designing mechanisms and scientific methods, to help in raising the security efficiency , and to provide the entire protection for data by using different methods with a special focusing on sensitive data.