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Date: Tue, 3 May 2005 12:58:33 -0400
From: "Tim Farley" <>
To: <>
Cc: <>
Subject: RE: ASP.NET __VIEWSTATE crypto validation prone to replay attacks

Microsoft has addressed your issues 1-a, 1-b and 1-c by adding a property "ViewStateUserKey" to the System.Web.UI.Page class in .NET Framework 1.1.  The documentation for this property is here:

Of course, it is up to the individual web page developer to ensure an appropriate non-trivial value has been placed into this property.  As we all know, this is exactly the sort of detail that developers often forget or flub, with disastrous results.

--Tim Farley
  SPI Dynamics

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