ProtectedMemory Class

Provides methods for protecting and unprotecting memory. This class cannot be inherited.

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

public sealed class ProtectedMemory

This class provides access to the Data Protection API (DPAPI) available in Microsoft Windows XP and later operating systems. This is a service that is provided by the operating system and does not require additional libraries. It provides encryption for sensitive data in memory.

The class consists of two wrappers for the unmanaged DPAPI, Protect and Unprotect. These two methods can be used to encrypt and decrypt data in memory.

TopicLocation
How to: Use Data Protection.NET Framework: Security
How to: Use Data Protection.NET Framework: Security

The following code example shows how to use data protection.

using System;
using System.Security.Cryptography;

public class MemoryProtectionSample
{

	public static void Main()
	{
// Create the original data to be encrypted (The data length should be a multiple of 16).
		
byte [] secret = { 1, 2, 3, 4, 1, 2, 3, 4, 1, 2, 3, 4, 1, 2, 3, 4 };

// Encrypt the data in memory. The result is stored in the same same array as the original data.
		ProtectedMemory.Protect( secret, MemoryProtectionScope.SameLogon );
	
// Decrypt the data in memory and store in the original array.
		ProtectedMemory.Unprotect( secret, MemoryProtectionScope.SameLogon );
	}

}

System.Object
  System.Security.Cryptography.ProtectedMemory

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0, 2.0
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