"A program that appears legitimate, but performs some illicit activity when it is run. It may be used to locate password information or make the system more vulnerable to future entry. A Trojan is similar to a virus, except that it does not replicate itself."
A cookie, however, is:
"Used for authentication, storing site preferences, shopping cart contents, the identifier for a server-based session, or anything else that can be accomplished through storing text data. They cannot replicate themselves and are not viruses"
It seems that the main difference between these two concepts is their degree of illicit activity. While trojans are usually malicious, cookies are simply 'investigative.' What can we do about this? How do we keep cookie's out of our computers entirely?
To put it simply, we can't.
Online information (web sites, videos, images) travel through the airwaves in streams of binary code. When they reach our computer, they enter through a variety of 'ports.' There are hundreds of ports built into the firmware of the computer and each is specialized to perform certain tasks at a certain rate. Often, malware will travel into your computer by exploiting ports that are not monitored actively by your computer. Cookies, however, enter through the normally open ports, disguised as elements of the website. While there are methods available to block some of them, there are numerous ways they can be incorporated within other site data in order to subvert software meant to prevent their entry.
Information is a two-way process, and websites will always have the ability to collect raw data on their visitors. The only question is, "how much is legal?" The FTC recently released a report citing how 'reasonable provision' would be made to protect consumer privacy but such general prose provides no direction or authority for regulatory bodies to step in. While there's no easy solution for the average internet user, the best advice I can give is to always stay informed.
Jared
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