DataProtectionScope Enumeration
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.
Imports System Imports System.Security.Cryptography Public Class DataProtectionSample ' Create byte array for additional entropy when using Protect method. Private Shared s_aditionalEntropy As Byte() = {9, 8, 7, 6, 5} Public Shared Sub Main() ' Create a simple byte array containing data to be encrypted. Dim secret As Byte() = {0, 1, 2, 3, 4, 1, 2, 3, 4} 'Encrypt the data. Dim encryptedSecret As Byte() = Protect(secret) Console.WriteLine("The encrypted byte array is:") PrintValues(encryptedSecret) ' Decrypt the data and store in a byte array. Dim originalData As Byte() = Unprotect(encryptedSecret) Console.WriteLine("{0}The original data is:", Environment.NewLine) PrintValues(originalData) End Sub Public Shared Function Protect(ByVal data() As Byte) As Byte() 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 e As CryptographicException Console.WriteLine("Data was not encrypted. An error occurred.") Console.WriteLine(e.ToString()) Return Nothing End Try End Function Public Shared Function Unprotect(ByVal data() As Byte) As Byte() Try 'Decrypt the data using DataProtectionScope.CurrentUser. Return ProtectedData.Unprotect(data, s_aditionalEntropy, DataProtectionScope.CurrentUser) Catch e As CryptographicException Console.WriteLine("Data was not decrypted. An error occurred.") Console.WriteLine(e.ToString()) Return Nothing End Try End Function Public Shared Sub PrintValues(ByVal myArr() As [Byte]) Dim i As [Byte] For Each i In myArr Console.Write(vbTab + "{0}", i) Next i Console.WriteLine() End Sub End Class
Available since 2.0