.NET Framework Security

Welcome to .NET Framework Security Documentation

The .NET Framework provides a comprehensive security model that helps you protect your applications and data. This documentation covers the core concepts, APIs, and best practices for building secure .NET applications.

Key Topics

• Code Access Security (CAS) – Managing permissions for assemblies.
• Role‑Based Security – Controlling access based on user roles.
• Cryptography – Using encryption, hashing, and digital signatures.
• Secure Coding Practices – Techniques to avoid common vulnerabilities.
• Security Tools – Tools such as FxCop, Code Analysis, and the .NET Security Analyzer.

Quick Example: Encrypting Data

using System;
using System.Security.Cryptography;
using System.Text;

public class CryptoDemo
{
    public static string Encrypt(string plainText, string key)
    {
        using (Aes aes = Aes.Create())
        {
            aes.Key = SHA256.Create().ComputeHash(Encoding.UTF8.GetBytes(key));
            aes.IV = new byte[16]; // Zero IV for demo only

            ICryptoTransform encryptor = aes.CreateEncryptor();
            byte[] input = Encoding.UTF8.GetBytes(plainText);
            byte[] output = encryptor.TransformFinalBlock(input, 0, input.Length);
            return Convert.ToBase64String(output);
        }
    }

    public static void Main()
    {
        string secret = Encrypt("Sensitive data", "MySecureKey");
        Console.WriteLine(secret);
    }
}

This sample demonstrates symmetric encryption using the Aes class. For production code, ensure a unique IV and proper key management.

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