Is it possible to decrypt and view ViewState values?

Question

I know there are tools out there that will let you see the content of asp.net viewstate. Is it possible to see and modify the content of viewState if it has been encrypted

Answer 1

Edit: Here's a new link for an online viewstate decoder, since the original one is no longer available.

https://www.httpdebugger.com/Tools/ViewstateDecoder.aspx

Original:

I like this view state decoder. Very easy to use.

removed outdated link