Computer security is in the news.
Not a day goes by when we do not hear about a security breach ranging from innocent intrusions to serious breaches of national security and confidential information. The globalization of financial markets, the spread of advanced technologies, and the rapid diffusion of information have combined to produce an increasingly interdependent world. The Social Security System may fail to send checks to the proper people. Air traffic control systems may be disabled causing near miss mid-air collisions. Salary and other payments may end up in unnumbered accounts in Zurich.