The security of information systems is a very complex issue which requires the preparation of strategies that allow information to flow freely, while ensuring the safety of using information systems throughout the Community. The safety assurance process is related to establishing a level of confidence in the system that could be very variable. This is a matter of professional opinion based on evidence about the system, its environment and its development process. Are spelled out in this article all about the security of information, data escrow, auditing systems, as well as the approach to measure the performance of the security, progress and advancement strategies and achieving its objectives. They consider the impact of insecurity on productivity by focusing on the Model Analysis for the Return on Security Investment (ROSI) derived from the financial indicator known ROI (Return on Investment). This model seeks to justify the investment in information security in monetary terms.