The security The agenda           Introduction for the security Networks and exchanges of data Computer security The risks The attacks Social Engineering Categories of attacks Parades for the attacks The security architecture An example Introduction for the security  Networks and exchanges of data  Computer security  The risks Networks and exchanges of data  For the exchange of the data, we've changed the technology   The paper before and now the electronic support The electronic version, it's very abstract solution and it's not easy define the global perimeter.  The Intranets, the private networks inside the companies appear all over the world and grow. The benefits are important :     Gain of the productivity Gain of the time Communications most effectives Distribution of the information is better  The interconnection for all these networks use Internet for the simple reasons :    Data shared with the clients and the partners Propose different services Profitability   Networks and exchanges of data The connection between Internet and the company's network open a large way with a lot of persons. They can use this solution and they obtain a lot of services. But Inside an Intranet we find a lot of data and information. For the live of the company, they're critical. If in the network, the security is bad, the information can be divulged and the system's properties. Question 1 : The persons use only the initial services ? Question 2 : How the persons use the services ? . The security The agenda           Introduction for the security Networks and exchanges of data Computer security The risks The attacks. security  The risks Networks and exchanges of data  For the exchange of the data, we've changed the technology   The paper before and now the electronic