Web Security, Privacy & Commerce, 2nd Edition

Conclusion

Downloaded machine code can severely compromise the reliability and security of any computer’s operating system. Although once there was a time when Internet users would routinely spend hours each month downloading new browsers, email clients, and plug-ins, that time is fortunately drawing to an end. The current generation of Internet software is more than adequate for most users, and today’s new computers usually come with a wide variety of plug-ins and helper applications preinstalled. As a result, the joys of multimegabyte downloads over relatively slow dialup modems is quickly receding from memory.

On the other hand, few users understand the dangers that downloaded code can pose for their computer systems. With the advent of high-speed Internet connections provided by cable modems and DSL lines, more and more users are likely to surf and sample not only interesting web sites, but programs as well. Internet connections that are always on increase the opportunities for stealthily-crafted Trojan horse programs to do their damage without being detected.

In the next chapter, we’ll explore a variety of technologies that are designed to mitigate the dangers of downloaded code: Java, JavaScript, Flash, and Shockwave.