UNIX Security Books

• Braun, Christoph. UNIX System Security Essentials. Wokingham, England: Addison-Wesley, 1994, ISBN 0-201-42775-3.
  A good overview of UNIX security even though the title's reference system is SINIX, a somewhat obscure UNIX implementation from Siemens Nixdorf.
• Curry, David A. UNIX System Security: A Guide for Users and System Administrators. Reading, MA: Addison-Wesley, 1994, ISBN 0-201-56327-4.
  This hardcover book covers all the bases.
• Farrow, Rik. UNIX System Security. Reading, MA: Addison-Wesley, 1991, ISBN 0-201-57030-0.
  A solid if somewhat dated overview of practical UNIX security.
• Ferbrache, David, and Gavin Shearer. UNIX Installation, Security & Integrity. Englewood Cliffs, NJ: Prentice Hall, 1993, ISBN 0-13-015389-3.
  A decent overview of UNIX security that's particularly strong on programming for security.
• Garfinkel, Simson, and Gene Spafford. Practical UNIX and Internet Security . Sebastopol, CA: O'Reilly & Associates, 1996, ISBN 1-56592-148-8.
  This is the "bible" of practical UNIX security, the one security book you'd want if you could only have one.
• R&D Books. UNIX Security: Sys Admin Essential Reference Series . Lawrence, KS: R&D Books, 1997, ISBN 0-87930-471-5.