UNIX system security : how to protect your data and prevent intruders / Rik Farrow. Farrow, Rik, 1950- UNIX (Computer file) Computer security. QA76.76.O63 F38 1990 005.8 20 FAU "A Benchmark book"--P. [4] of cover Includes bibliographical references (p. 267-268) and index. Reading, Mass. : Addison-Wesley Pub. Co., c1991. c1991. 1991 Text vii, 278 p. ; eng