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DataProtectionScope Enumeration
Visual Studio 2010
Specifies the scope of the data protection to be applied by the Protect method.
Assembly: System.Security (in System.Security.dll)
| Member name | Description | |
|---|---|---|
| CurrentUser | The protected data is associated with the current user. Only threads running under the current user context can unprotect the data. | |
| LocalMachine | The 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.Security.dll> using namespace System; using namespace System::Security::Cryptography; public ref class DataProtectionSample { private: // Create byte array for additional entropy when using Protect method. static array<Byte>^s_aditionalEntropy = {9,8,7,6,5}; public: static void Main() { // Create a simple byte array containing data to be encrypted. array<Byte>^secret = {0,1,2,3,4,1,2,3,4}; //Encrypt the data. array<Byte>^encryptedSecret = Protect( secret ); Console::WriteLine( "The encrypted byte array is:" ); PrintValues( encryptedSecret ); // Decrypt the data and store in a byte array. array<Byte>^originalData = Unprotect( encryptedSecret ); Console::WriteLine( "{0}The original data is:", Environment::NewLine ); PrintValues( originalData ); } static array<Byte>^ Protect( array<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 ); return nullptr; } } static array<Byte>^ Unprotect( array<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 ); return nullptr; } } static void PrintValues( array<Byte>^myArr ) { System::Collections::IEnumerator^ myEnum = myArr->GetEnumerator(); while ( myEnum->MoveNext() ) { Byte i = safe_cast<Byte>(myEnum->Current); Console::Write( "\t{0}", i ); } Console::WriteLine(); } }; int main() { DataProtectionSample::Main(); }
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
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