A sweeping revision of the classic computer security text. This book provides end-to-end, detailed coverage of the state of the art in all aspects of computer security. Starting with a clear, in-depth review of cryptography, it also covers specific options for securing software and data against malicious code and intruders; the special challenges of securing networks and distributed systems; firewalls; ways to administer security on personal computers and UNIX systems; analyzing security risks and benefits; and the legal and ethical issues surrounding computer security.