Press Win+R key in combination to bring up the ‘Run’ dialog box.
Type ‘inetmgr’ in it and hit the ‘OK’ button.
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Internet Information Services (IIS) Manager screen should be opened.
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Double click on Machine Key. Machine Key section will be opened.
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In the Machine Key section you can change the Validation method and Encryption method using drop down, default is SHA1 and Auto respectively.
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Now you have new Validation key and associated Decryption Key. You can use this in the configuration file of any application using below code snippet:
Or if you want to use the key in same application click Apply in the Actions pane and the machine key will be updated in web.config.
<machineKey validationKey="883A787F3B793567817EA540DCA4285B1A695C58A38B3493E1E69821148E5E6B5032F61813DF81B9731AB5F8AF7ECA3A75429E38D6513408E86ED4AC77243439" decryptionKey="7F0884CE1698D23538D4FC3670FD122FCF856645518617B7" validation="SHA1" decryption="Auto"/>
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