Whenever a user browses a Web page, the page is sent to the user's machine where it is usually stored on the hard drive in a Temp directory. This means that even after a user has stopped browsing a Web site, parts of the site are still locally stored on the user's machine. Therefore, even though content may have been transmitted on an encrypted channel (SSL), it is most likely stored unencrypted. If someone were to get the user's machine, he may be able to access these files. Although that should be somewhat of a concern, a bigger concern is what happens if the user accesses the IVE from a machine that is not his, such as a kiosk or other public computer. Then these sensitive files will most likely be left on the machine.

To help combat this potential security issue, Juniper has deployed an application called Cache Cleaner. Just as the name implies, its primary job is to clean the Web browser cache (or other directories as well) of any content that is being stored during the IVE session, thus clearing the user's "tracks" on the machine so that another user won't be able to access the cached content. In this section, we will discuss the various aspects of Cache Cleaner, how it is deployed, and the options that apply to Cache Cleaner that dictate how it will behave on the user's machine.