The solution contains two projects:

1. CookieEncryptionModule - this is the HTTP module class library that does the actual work.
2. CookieEncryptionTestWeb - this is a web project that has been 'wired up' to use the HTTP module.

Using the module is as simple as dropping the CookieEncryptionModule.dll into the web application bin folder and adding a reference to the httpModules section in the web.config (see test project).