How to encrypt and decrypt viewstate values in web.config and page files in the most secure manner?

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How to encrypt and decrypt viewstate values in web.config and page files in the most secure manner?
When Tested with App Scan tool vulnerability shown is higher for the viewstate encryption decryption process. Hackers can tamper the data because of this. Viewstate has been avoided in max places as it causes Performance issues. I am using VS 2005(asp.net with c#) and Sql server 2005.

Posted 3-Jun-14 3:09am

Rahul 105

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Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) · Answer 1 · 2014-06-03T03:26:00

Solution 1

Refer How to make ViewState secure in ASP.NET[^].

Quote:
We can also enable these settings for EnableViewStateMAC and ViewStateEncryptionMode in web.config:

Posted 3-Jun-14 3:26am

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ)

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Nirav Prabtani 4-Jun-14 2:36am

my 5+

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) 4-Jun-14 2:59am

Thanks Nirav. :)

adriancs · Answer 2 · 2014-06-03T20:04:00

Another way is playing it with your own encryption library.

This article explains how to intercept the viewstate handling process:
ViewState Compression[^]

This article explains how to encrypt bytes:
C# AES 256 bits Encryption Library with Salt[^]

Combining these 2 articles enables you to encrypt the viewstate yourself.