A decade ago, a company looking to secure its computer systems would have purchased antivirus software, a firewall, and perhaps an intrusion detection system. Today, the growing variety of attacks has given rise to nearly 70 different security niches, including markets for firewalls that specifically protect Web-based applications and for systems that prevent data loss across an enterprise. Meanwhile, each submarket is getting increasingly complex. In 2009 one of the biggest security companies, Symantec, generated 2.9 million separate signatures, or digital patterns associated with malicious software-an increase of 71 percent over the previous year.
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