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This new edition of Practical UNIX and Internet Security provides detailed coverage of modern security and networking issues. It focuses on the four most popular Unix variants: Solaris, Linux, FreeBSD, and Mac OS X. It covers: computer security basics - introduction to security problems and solutions, Unix history and lineage, and the importance of security policies as a basic element of system security; security building blocks: fundamentals of Unix passwords, users, groups, the Unix file system, cryptography, physical security, and personnel security; network security - a detailed look at modem and dialup security, TCP/IP, securing individual network services, Sun's RPC, various host and network authentication systems (e.g., NIS, NIS+, and Kerberos), NFS and other file systems, and the importance of secure programming; secure operations - keeping up to date in today's changing security world, backups, defending against attacks, performing integrity management, and auditing; and incidents - discovering a break-in, dealing with programmed threats and denial of service attacks, and legal aspects of computer security.