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"Encrypting View State Although MAC encoding helps prevent tampering with view state data, it does not prevent users from viewing the data. You can prevent people from viewing this data in two ways: by transmitting the page over SSL, and by encrypting the view state data. Requiring the page to be sent over SSL can help prevent data-packet sniffing and unauthorized data access by people who are not the intended recipients of the page. However, the user who requested the page can still view the view state data because SSL decrypts the page to display it in the browser. This is fine if you are not concerned about authorized users having access to view state data. However, in some cases, controls might use view state to store information that no users should have access to. For example, the page might contain a data-bound control that stores item identifiers (data keys) in view state. If those identifiers contain sensitive data, such as customer IDs, you should encrypt the view state data in addition to or instead of sending the page over SSL. To encrypt the data, set the page's ViewStateEncryptionMode property to true. If you store information in view state, you can use regular read and write techniques; the page handles all encryption and decryption for you. Encrypting view state data can affect the performance of your application. Therefore, do not use encryption unless you need it. Control State Encryption Controls that use control state can require that view state be encrypted by calling the RegisterRequiresViewStateEncryption method. If any control in the page requires that view state be encrypted, all view state in the page will be encrypted. Per-user View State Encoding If a Web site authenticates users, you can set the ViewStateUserKey property in the Page_Init event handler to associate the page's view state with a specific user. This helps prevent one-click attacks, in which a malicious user creates a valid, pre-filled Web page with view state from a pre

Encrypting Connection Strings in Web.config

A very simple module that allows you encrypt and decrypt query string parameters. Source code is given, so it is extendable.

Fast symmetric cryptography in Javascript