OpenCrypt is designed for use on Unix and Linux web servers but is also compatible with some Windows and Sun Solaris web servers.

OpenCrypt is designed for the Apache Web Server software though this is not required unless you wish to use the 'traditional pop-up login prompt', if running Microsoft IIS web server or other web server software then OpenCrypt's 'PHP Login Interface' can still be used.

OpenCrypt is written in Perl and PHP, both of which are available free or charge and are supported by all popular web server software.

A number of additional Perl modules are also required, these are often not installed by default and are the most common cause of error during installation of the software. The Perl modules are available free of charge and most web hosting companies are more than happy to install the modules for you free of charge, details of the required Perl modules are shown to the right of this text.

OpenCrypt uses a mySQL database system to store system data for optimal speed and efficiency, mySQL is also available free of charge and is supported by all popular web server software.

The OpenCrypt software source code is 100% available and unobfuscated.

From your customer's point of view (the software end-user), the only requirement is an Internet web browser with a suitable Internet connection. The software is thoroughly tested in all the most popular web browsers including; Microsoft Internet Explorer, Mozilla Firefox and Apple Safari. The software frontend does not rely upon any JavaScript to ensure 100% compatibility, where JavaScript is used it is merely included to enhance the user expeirence, a fallback is always in-place for non-compatible users. This approach also applies to the HTML layout which is controlled using traditional HTML rather than CSS/stylesheets, again this is done to ensure 100% compatibility and CSS is merely used to enhance the design and user experience. Recent statistics show that JavaScript and CSS compatibility are on the increase, however the percentage of users with web browsers that support JavaScript and CSS still remains at around 94%. Note, this figure does not necessarily represent compatible browsers, in the case of JavaScript many users disable JavaScript support in their web browser. We consider 94% to be unacceptable and would not release a software package which did not work for 1 in 17 users.