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ASP.NET verifies signature verification when it receives viewstate values, forms authentication cookies that it produces and sends to client before.
ViewState is one of the most important aspects of ASP.NET WebForms applications as with forms authentication cookies both for ASP.NET WebForms and MVC applications that should not be tampered and forged by the attackers.
This integrity verification can be disabled with a configuration directive below;
<appSettings> <add key="aspnet:UseLegacyEncryption" value="true" /> </appSettings>
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