Click fraud
occurs when an individual or computer program fraudu-
lently clicks on an online ad without any intention of learning more about the
advertiser or making a purchase. Click fraud has become a serious problem at
Google and other Web sites that feature pay-per-click online advertising.
Some companies hire third parties (typically from low-wage countries) to
fraudulently click on a competitor’s ads to weaken them by driving up their
marketing costs. Click fraud can also be perpetrated with software programs
doing the clicking, and botnets are often used for this purpose. Search engines
such as Google attempt to monitor click fraud but have been reluctant to
publicize their efforts to deal with the problem.
G l o b a l T h r e a t s : C y b e r t e r r o r i s m a n d C y b e r w a r f a r e
The cybercriminal activities we have described—launching malware, denial-of-
service attacks, and phishing probes—are borderless. Computer security firm
Sophos reported that 42 percent of the malware it identified in early 2010
originated in the United States, while 11 percent came from China, and 6 per-
cent from Russia (Sophos, 2010). The global nature of the Internet makes it pos-
sible for cybercriminals to operate—and to do harm—anywhere in the world.
Concern is mounting that the vulnerabilities of the Internet or other
networks make digital networks easy targets for digital attacks by terrorists,
foreign intelligence services, or other groups seeking to create widespread
disruption and harm. Such cyberattacks might target the software that runs
electrical power grids, air traffic control systems, or networks of major banks
and financial institutions. At least 20 countries, including China, are believed to
be developing offensive and defensive cyberwarfare capabilities. The chapter-
ending case study discusses this problem in greater detail.
INTERNAL THREATS: EMPLOYEES
We tend to think the security threats to a business originate outside the organi-
zation. In fact, company insiders pose serious security problems. Employees
have access to privileged information, and in the presence of sloppy internal
security procedures, they are often able to roam throughout an organization’s
systems without leaving a trace.
Studies have found that user lack of knowledge is the single greatest cause of
network security breaches. Many employees forget their passwords to access
computer systems or allow co-workers to use them, which compromises the
system. Malicious intruders seeking system access sometimes trick employees
into revealing their passwords by pretending to be legitimate members of the
company in need of information. This practice is called
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