Implementing security in a site has the following aspects:
-> Authentication – it is the process of ensuring the user’s identity and authenticity. ASP.Net allows four types of authentication system:
1. Windows Authentication
2. Forms Authentication
3. Passport Authentication
4. Custom Authentication
-> Authorization – it is the process of defining and allotting specific roles to specific users.
Confidentiality – it involves encrypting the channel between the client’s browser and the web server.
-> Integrity – it involves maintaining the integrity of data. For example, implementing digital signature.
Also you ca see the below links:-
http://www.tutorialspoint.com/asp.net/asp.net_security.htm
http://msdn.microsoft.com/en-us/library/91f66yxt(v=vs.90).aspx
http://msdn.microsoft.com/en-us/library/ff648635.aspx
Happy Coding
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