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MachineKey::Unprotect Method

.NET Framework 4.5

Unprotects the specified data, which was protected by the Protect method.

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

static array<unsigned char>^ Unprotect(
	array<unsigned char>^ protectedData, 
	... array<String^>^ purposes


Type: array<System::Byte>

The ciphertext data to unprotect.

Type: array<System::String>

A list of purposes that describe what the data is meant for. This must be the same value that was passed to the Protect method when the data was protected.

Return Value

Type: array<System::Byte>
The plaintext data.


The protectedData parameter is null.


The purposes array contains one or more whitespace-only entries.


Possible causes include the following:

  • The protected data was tampered with.

  • The value of the purposes parameter is not the same as the value that was specified when the data was protected.

  • The application is deployed to more than one server and is using auto-generated encryption keys.

For information about this method, see the Protect method.

.NET Framework

Supported in: 4.6, 4.5

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

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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