Was this page helpful?
Your feedback about this content is important. Let us know what you think.
Additional feedback?
1500 characters remaining
MachineKey Class
Collapse the table of content
Expand the table of content

MachineKey Class

.NET Framework 4.6 and 4.5

Provides a way to encrypt or hash data (or both) by using the same algorithms and key values that are used for ASP.NET forms authentication and view state.


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

public static class MachineKey

The MachineKey type exposes the following members.

Public methodStatic memberDecode Obsolete. Decodes and/or validates data that has been encrypted or provided with a hash-based message authentication code (HMAC).
Public methodStatic memberEncode Obsolete. Encrypts data and/or appends a hash-based message authentication code (HMAC).
Public methodStatic memberProtectProtects the specified data by encrypting or signing it.
Public methodStatic memberUnprotectUnprotects the specified data, which was protected by the Protect method.


The data to encrypt, hash, decrypt, or validate does not exist

The MachineKey class provides methods that expose the hashing and encryption logic that ASP.NET provides. For information about which encryption and hashing algorithms ASP.NET uses, and the key values that it uses with them, see machineKey Element (ASP.NET Settings Schema).

Caution noteCaution

The MachineKey APIs should only be used in an ASP.NET app. Behavior of the MachineKey APIs outside the context of an ASP.NET application is undefined

.NET Framework

Supported in: 4.6, 4.5, 4

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.
© 2015 Microsoft