This Edition contains an all-new chapter on the Economics of Cybersecurity, explaining ways to make a Business case for Security Investments. Is There a Security Problem in Computing, Elementary Cryptography, Program Security, Protection in General-Purpose Operating Systems, Designing Trusted Operating Systems, Database and Data Mining Security, Security in Networks, Administering Security, The Economics of Cybersecurity, Privacy in Computing, Legal and Ethical Issues in Computer Security, Cryptography Explained, Bibliography.