Search HowStuffWorks and the web:
 

Computer surveillance and security covers a wide range of ways to keep you and your information safe. Learn about firewalls, zombie computers, hackers and workplace surveillance.
Related Categories:
> Authentication

How Internet Cookies Work

Forward this article to five of your friends.

Your Name:

Your E-mail:

Friend #1 E-mail:

Friend #2 E-mail:

Friend #3 E-mail:

Friend #4 E-mail:

Friend #5 E-mail:

Your Message:



Please enter the characters you see above:
This helps HowStuffWorks prevent automated emails.

ADVERTISEMENT
Browse Browse Videos Browse Videos
 
  •  
    VIDEO SELECTIONS
     
HowStuffWorks
How Dry Cleaning Works

 
HowStuffWorks
How Clutches Work: Definition

 
HowStuffWorks
How Fireworks Work

 
xTrain
Basic Cast Drawing in Photoshop by Ron Lemen

 
Harvard Extension School's Computer Science E-1: Understand
Browser Wars

 
Harvard Extension School's Computer Science E-1: Understand
Browser Extensions

 
Sub-Zero/Wolf
How to Make Flourless Chocolate Cake

 
HowStuffWorks
How Camcorders Work

 
MediaLink
Create Memories That Will Last a Lifetime

 
 
  •  
    TOP SELLING
    FIREWALLS
80 Mbps Throughput, 4 LAN Ports, Features: Stateful Packet Inspection (SPI), DoS Prevention, Content Filtering, URL Filtering, Act...
$302 - $347

24 Mbps Throughput, 4 LAN Ports, Features: Stateful Packet Inspection (SPI), DoS Prevention, Content Filtering, URL Filtering, Act...
$151 - $208

90 Mbps Throughput, 24 LAN Ports, Features: Stateful Packet Inspection (SPI), DoS Prevention, Intrusion Prevention, Blacklist Spam...
$941 - $1135