Wireless Fidelity – Wi Fi | Part 3

Wireless Fidelity – Wi Fi | Part 3

Wi-Fi — Confidentiality Worries

Most Wi-Fi networks do not provide any protection from unauthorized use. This is because the default settings during the acquisition do not require users to use any method of protection (hence the average user does not change either through ignorance or for convenience). This has led to proliferate in urban areas of a large number of private networks freely accessible.

Sometimes it happens to use other people’s networks without permission, if they have a level of strongest signal of their own. This leads to problems of security in the event are transmitted sensitive data or personal information (credit card numbers, telephone numbers, bank details).

Methods to prevent unauthorized use were born hand in hand with the development of new technologies and the “rupture” of the previous algorithms. The first system developed was WEP, Wired Equivalent Protocol but suffers from inherent problems that make it, in fact, useless. You can suppress the SSID broadcast identification or restrict access to MAC addresses well-defined, but it is easily subject to manipulation methods. To overcome the problems of WEP were invented WPA and WPA2 security levels that offer more.

To have a greater level of security is however necessary to implement authentication systems to a level of ISO / OSI stack higher. They may be based on RADIUS authentication server, the creation of encrypted VPN tunnels or PPPoE.

Obviously the best method of protection is to contain the propagation of radio waves which are not necessary. This can be implemented in software by limiting the transmission power or by using antennas with a lobe of radiation directed only to areas where connectivity is required.

Alleged damage to health due to Wi-Fi

There are ongoing investigations, including the BBC’s Panorama, which investigates allegations of some scientists that electromagnetic smog which could give rise to long-term damage to health. In particular it is noted that the frequencies of Wi-Fi are the same (though with much lower power) used by microwave ovens, which permits the cooking of food (2450 MHz). In addition to this thermal effect, the engineers point to the possibility of an additional biological effect is not related to the increase of temperature but still significant.

The transmission of Rai Tre Report, 11 May 2008, he reiterated the BBC investigation has documented and alarms, especially in relation to damage that can be created for children and persons Electro, which raise many institutions in the world to prevent installation Wi-Fi networks in schools or kindergartens. According to some, during this investigation were not provided precise figures and technical details.

Most of the respondents would be deployed only technical side of the alarm is the only one who instead gave a version would have been reassuring on companies accused of conniving with the industry (as indeed he has worked for some of them). The same BBC report also said that the treatment of respondents was not balanced. However, although absolute data were not provided, it was determined that indoor emissions of Wi-Fi were much higher than those of mobile telephony, it should be pointed out that the existing radio bands used in the UMTS system have frequencies very close to those of Wi-Fi.

The German government in 2007 decided to inform the German citizens of the possible health risks caused by excessive exposure to radiation Wi-Fi. The decision of Berlin following the initiation of the Health Protection Agency (HPA) for England, aimed at assessing the real dangers of wide use of Wi-Fi in schools of the Kingdom. German government spokesman said “Do not forget that Wi-Fi is a relatively new technology, yet to be developed. While the public hot-spots have low levels of radiation, within the home or work you can easily reach a critical threshold.”

Wi-Fi Hotspots

The hotspot is a short term for wireless internet hotspot (literally “point of wireless Internet access). This is a public high peak and clearly delimited (café, hotel, station, etc.) Which gives access to a wireless network allows mobile users to easily connect to the Internet. In early 2006, there were 100 000 Wi-Fi hotspots worldwide. Many directories areas wireless access is now available online to facilitate research in these areas around the world, like the locators areas Trustive Wi-Fi, and WiFi411 JiWire.

Study: From Wikipedia, the free encyclopedia. The text is available under the Creative Commons.


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