Why security is important: Security is an important part of any web application development which is necessary to protect assets from unauthorized actions. This encapsulates verifying users, granting or denying access to sensitive information, or protecting data stored on the server.What ASP.NET has to offer: ASP.NET provides built-in functionality in the form of a security framework which includes classes for authentications and authorizations and sets of base classes for implementing confidentially and integrity. The ASP.NET security model is an extension of ASP.NET 2.0, or you can say it's the foundation of the ASP.NET 3.5 security model. ASP.NET 3.5 extends this Infrastructure with functionality for integration into Ajax.How ASP.NET implement security model: Gatekeepers.ASP.NET implements many components that enforce security for applications. Gatekeepers are conceptual patterns that apply a pipelining model to a security infrastructure. In this pipeline, a security mechanism is implemented by these individual components or gatekeepers. So this pipeline looks something like below.You can in the above image see a pipeline of gatekeepers. At the end of the pipeline, you can see the protected resource which could be anything like custom page code. The protected resource will be accessed or executed only if every gatekeeper grants access. If just one gatekeeper denies access, the request processing is returned to the caller with a security exception.What is this pipeline and gatekeeper in ASP.NET? This pipeline is a HTTP pipeline and ASP.NET implements the concept of gatekeepers through HTTP modules.These modules are just classes which are implementing the interface IHttpModule. Although a HTTP module is capable of multiple use, most of them are dedicated to a security level.How ASP.NET HTTP Modules acts as security gatekeepers: We know that web applications communication is based on HTTP which is stateless, which is that no information is retained for the user between requests. So it becomes important and necessary to authenticate and authorize the user at the beginning of each request. What ASP.NET does is that it fires a global application event to handle events by the use of HTTP modules to perform these authentication and authorization jobs.Let's see below what all these IHTTPModules classes are and how they act as gatekeeper.What are levels of Security in ASP.NET: Level of security is implemented by a few security mechanisms, discussed below:1. Authentication: Identifying user's identity and ensuring authenticity of this identity. There are 4 ways of implementing authentication, discussed below:
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