The SiteCrypter system gives public site content providers the ability to easily and flexibly apply strong encryption to any number of selected portions of their Web site pages. All visitors to the site can see the site's public content, and trusted visitors can also see their authorized private content. SiteCrypter encrypts site pages before they are posted, preventing the usual exposure of sensitive informaton on the server. The encryption is also permanent, since the clear-text display process does not change or produce any new files. Published private content is safe anywhere and at any time. All elements needed to protect a SiteCrypter site's private content are contained within the site's pages, including the industry-standard cryptographic algorithms. No other support is needed or used. Pages are produced in Design Mode, for free processing and testing private pages; and Publish Mode, requiring prelicensing through sitecrypter.com to publish the pages (about 60 cents per page).