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MachineKeySection.DecryptionKey Property

Gets or sets the key that is used to encrypt and decrypt data, or the process by which the key is generated.

Namespace:  System.Web.Configuration
Assembly:  System.Web (in System.Web.dll)

'Declaration
<TypeConverterAttribute(GetType(WhiteSpaceTrimStringConverter))> _
<StringValidatorAttribute(MinLength := )> _
<ConfigurationPropertyAttribute("decryptionKey", DefaultValue := "AutoGenerate,IsolateApps")> _
Public Property DecryptionKey As String
'Usage
Dim instance As MachineKeySection 
Dim value As String 

value = instance.DecryptionKey

instance.DecryptionKey = value

Property Value

Type: System.String
An encryption key value, or a value that indicates how the key is generated. The default is "AutoGenerate,IsolateApps".

The DecryptionKey property is used for encryption and decryption, such as in Windows Forms authentication, and for view state when the Validation property is set to "3DES".

Use the "AutoGenerate" option to specify that ASP.NET generates a random key and stores it in the Local Security Authority. The "AutoGenerate" option is part of the default value.

If you add the IsolateApps modifier to the DecryptionKey value, ASP.NET generates a unique encrypted key for each application by using each application's application ID. IsolateApps is also part of the default value.

If you need to support configuration across a network of Web servers (a Web farm), set the DecryptionKey property manually to ensure consistent configuration.

The following example demonstrates how to use the DecryptionKey property. This code example is part of a larger example provided for the MachineKeySection class.

' Display DecryptionKey property.
Console.WriteLine("DecryptionKey: {0}", configSection.DecryptionKey)

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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