internet.com
You are in the: Small Business Computing Channelarrow View Sites +
Small Business Technology
» ECommerce-Guide | Small Business Computing | Webopedia | WinPlanet |  »Close
Webopedia.com
Enter a word for a definition... ...or choose a computer category.
 
 

menu
   Home
   Term of the Day
   New Terms
   Pronunciation
   New Links
   Quick Reference
   Did You Know?
   Categories
   Tech Support
   Webopedia Jobs
   About Us
   Link to Us
   Advertising
  

talk to us
   Submit a URL
   Suggest a Term
   Report an Error

internet.com
Developer
International
Internet Lists
Internet News
Internet Resources
IT
Linux/Open Source
Personal Technology
Small Business
Windows Technology
xSP Resources
Search internet.com
Advertise
Corporate Info
Newsletters
Tech Jobs
E-mail Offers
commerce
  Be a Commerce Partner
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Tempest
Last modified: Monday, February 25, 2002 

In computer technology, the name Tempest originated with the U.S. military in the 1960s as the name of a classified study of the security of telecommunications devices that emit electromagnetic radiation (EMR). Every electronic, electro-optical or electromechanical device gives off some type of electromagnetic signals, whether or not the device was designed to be a transmitter. This is why the use of cellular phones is not permitted on airplanes - their unintentional signals can interfere with navigational equipment. The EMR that "leaks" from devices can be intercepted and, using the proper equipment, reconstructed on a different device. The U.S. government began studying this phenomenon in order to prevent breaches in military security, but today the term has made its way into popular culture because of the proliferation of pervasive computing.

The EMR that is emitted by devices contains the information that the device is displaying or storing or transmitting. With equipment designed to intercept and reconstruct the data, it is possible to steal information from unsuspecting users by capturing the EMR signals. For example, in theory someone sitting in a van outside a person's house can read the EMR that is emanating from the user's laptop computer inside the house and reconstruct the information from the user's monitor on a different device. Different devices have different levels of susceptibility to Tempest radiation, and more and more devices are being created that shield the EMR from leaking from the device. The distance at which emanations can be monitored depends on whether or not there are conductive media such as power lines, water pipes or even metal cabinets in the area that will carry the signals further away from the original source.

While the name Tempest was the code name for the military operations in the 1960s, at a later stage the word became an acronym for Telecommunications Electronics Material Protected from Emanating Spurious Transmissions and an abbreviation of Transient Electromagnetic Pulse Emanation Standard.

E-mail this definition to a colleague

Sponsored listings

Hoover's: Tempest Energy Corp. Company Research - Find information on Tempest Energy Corp. with operations and products, financials, officers, competitors and more at Hoover's.


For internet.com pages about Tempest . Also check out the following links!

Related Links

The Complete, Unofficial TEMPEST Information Page  
The information on these pages is completely derived from publicly available, unclassified sources.

An Introduction to TEMPEST
A 2001 article from the SANS Institute.

related categories

Ethics

Pervasive Computing

Security

Telecommunications

related terms

hacker

pervasive computing

telecommunications


webopedia
Give Us Your
Feedback


Shopping
Tempest Products
Compare Products,Prices and Stores

Shop by Category:
Kitchen Hoods
7 Model Matches

Shoes
61 Store Offers

Sport and Outdoor
126 Store Offers

Auto Parts and Accessories
1346 Store Offers

Food and Drink
26 Store Offers



JupiterWeb networks:

internet.comearthweb.comDevx.com graphics.com

Search JupiterWeb:

Jupitermedia Corporation has two divisions:
Jupiterimages andJupiterWeb


Legal Notices, Licensing, Reprints, & Permissions, Privacy Policy.

Jupitermedia Corporate Info | Newsletters | Tech Jobs | Shopping | E-mail Offers