In my humble opinion it will be difficult to define a final methodology for security key, just in front of the evolution of the Internet system. Recent statistics tell us that each year, quadruple digital data, and this means that the development of the Internet and, therefore, information technology, goes four times faster than normal, in this area, security must face every year with new technology and integrated systems to lower and define the risks of intrusion. It definitely needs a dynamic IT infrastructure that is able to evolve in step with the evolution of the global information system. Continuous updates on the issue of security must be taken into account by companies providing services of this kind; it is unthinkable to think about having security equal to 100%. But much can be done by investing on information security. The open Internet is a gateway to any data, there will always be intrusion into the system, because the very evolution of the intrusion system is in step with the very evolution of computer technology. They should use closed networks, but also in this case, then we would be totally cut off from the progress. In conclusion, it is not possible for me to define or list metodolorie to increase the security of the computer system, as well as those who already know.