UNIX has been around for decades. Many corporate giants have come along with their dazzling new proprietary operating systems in an attempt to replace the defacto standard for corporate servers, and some have done quite well, but UNIX remains dominant. There are many reasons for the popularity of UNIX. It is standardized, portable, and proven. Most importantly, however, UNIX is versatile. Most technological advances can be supported by the fundamental design of a UNIX system. Herein lies the problem which we will address in this booklet. A versatile operating system allows people to do many different things-- even if the system administrator doesn't want them to. When that happens, security is breached. In today's increasingly electronic society, security breaches have the potential of being very serious.

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