As businesses place more applications on the web, they expose more of their sensitive customer data to hackers. Browser-based applications tunnel through the entire security perimeter of an organization, giving users unprecedented access to internal systems. It's little wonder that the majority of attacks today target the application directly. For most organizations, the web application has in itself become the security perimeter, and the only way to ensure the security of those applications is what's known as an application firewall. However, application firewalls can only be effective if they are tailored to match closely to an application. Poorly-tailored gateways will inevitably block legitimate user or customer traffic or let in hackers. The F5 Application Security Manager (ASM), an application firewall, is a new class of device that protects applications from hackers and other malicious attacks. It enforces granular security policies to protect web applications as well as confidential information from both random and targeted application security attacks. And thanks to breakthrough technology that automatically generates an extremely accurate model of all legitimate user interaction with an application, ASM is able to filter all application requests and deny anything that is not legitimate user activity.