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DataProtectionScope Enumeration

Specifies the scope of the data protection to be applied by the Protect method.

Namespace: System.Security.Cryptography
Assembly: System.Security (in system.security.dll)

public enum DataProtectionScope
public enum DataProtectionScope
public enum DataProtectionScope

 Member nameDescription
CurrentUserThe protected data is associated with the current user. Only threads running under the current user context can unprotect the data. 
LocalMachineThe protected data is associated with the machine context. Any process running on the computer can unprotect data. This enumeration value is usually used in server-specific applications that run on a server where untrusted users are not allowed access. 

This enumeration is used with the Protect and Unprotect methods to protect data through encryption.

Caution   The LocalMachine enumeration value allows multiple accounts to unprotect data. Use this value only when you trust every account on a computer. For most situations, you should use the CurrentUser value.

The following code example shows how to use data protection.

using System;
using System.Security.Cryptography;

public class DataProtectionSample
{
// Create byte array for additional entropy when using Protect method.
	static byte [] s_aditionalEntropy = { 9, 8, 7, 6, 5 };

	public static void Main()
	{
// Create a simple byte array containing data to be encrypted.
		
byte [] secret = { 0, 1, 2, 3, 4, 1, 2, 3, 4 };

//Encrypt the data.
		byte [] encryptedSecret = Protect( secret );
		Console.WriteLine("The encrypted byte array is:");
		PrintValues(encryptedSecret);
		
// Decrypt the data and store in a byte array.
		byte [] originalData = Unprotect( encryptedSecret );
		Console.WriteLine("{0}The original data is:", Environment.NewLine);
		PrintValues(originalData);

	}

	public static byte [] Protect( byte [] data )
	{
		try
		{
			// Encrypt the data using DataProtectionScope.CurrentUser. The result can be decrypted
			//  only by the same current user.
			return ProtectedData.Protect( data, s_aditionalEntropy, DataProtectionScope.CurrentUser );
		} 
		catch (CryptographicException e)
		{
			Console.WriteLine("Data was not encrypted. An error occurred.");
			Console.WriteLine(e.ToString());
			return null;
		}
	}

	public static byte [] Unprotect( byte [] data )
	{
		try
		{
			//Decrypt the data using DataProtectionScope.CurrentUser.
			return ProtectedData.Unprotect( data, s_aditionalEntropy, DataProtectionScope.CurrentUser );
		} 
		catch (CryptographicException e)
		{
			Console.WriteLine("Data was not decrypted. An error occurred.");
			Console.WriteLine(e.ToString());
			return null;
		}
	}

	public static void PrintValues( Byte[] myArr )  
	{
	      foreach ( Byte i in myArr )  
		  	{
		         Console.Write( "\t{0}", i );
			 }
      Console.WriteLine();
	 }

}

import System.*;
import System.Security.Cryptography.*;

public class DataProtectionSample
{
    // Create byte array for additional entropy when using Protect method.
    private static ubyte sAditionalEntropy[] =  { 9, 8, 7, 6, 5 };

    public static void main(String args[])
    {
        // Create a simple byte array containing data to be encrypted.
        ubyte secret[] =  { 0, 1, 2, 3, 4, 1, 2, 3, 4 };
        //Encrypt the data.
        ubyte encryptedSecret[] = Protect(secret);
        Console.WriteLine("The encrypted byte array is:");
        PrintValues(encryptedSecret);
        // Decrypt the data and store in a byte array.
        ubyte originalData[] = Unprotect(encryptedSecret);
        Console.WriteLine("{0}The original data is:", 
            Environment.get_NewLine());
        PrintValues(originalData);
    } //main

    public static ubyte[] Protect(ubyte data[])
    {
        try {
            // Encrypt the data using DataProtectionScope.CurrentUser. 
            // The result can be decrypted only by the same current user.
            return ProtectedData.Protect(data, sAditionalEntropy, 
                DataProtectionScope.CurrentUser);
        }
        catch (CryptographicException e) {
            Console.WriteLine("Data was not encrypted. An error occurred.");
            Console.WriteLine(e.ToString());
            return null;
        }
    } //Protect

    public static ubyte[] Unprotect(ubyte data[])
    {
        try {
            //Decrypt the data using DataProtectionScope.CurrentUser.
            return ProtectedData.Unprotect(data, sAditionalEntropy, 
                DataProtectionScope.CurrentUser);
        }
        catch (CryptographicException e) {
            Console.WriteLine("Data was not decrypted. An error occurred.");
            Console.WriteLine(e.ToString());
            return null;
        }
    } //Unprotect

    public static void PrintValues(ubyte myArr[])
    {
        for (int iCtr = 0; iCtr < myArr.length; iCtr++) {
            ubyte i = myArr[iCtr];
            Console.Write("\t{0}", System.Convert.ToString(i));
        }
        Console.WriteLine();
    } //PrintValues
} //DataProtectionSample 

Windows 98, Windows Server 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0

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