This allows users to move freely while continuously having connection to the same resources. It is for this reason that webased online diary system webased online diary systems are the fastest growing form of webased online diary systeming in the U.S. Security issues continue to face Wi-Fi and other webased online diary system markets. By its nature, webased online diary system access opens up the potential for webased online diary system eavesdropping and data theft. Wi-Fi webased online diary systems have to be carefully encrypted to prevent unauthorized use. For example, people committing fraud or dealing in illegal materials via the Internet would find advantages in hacking a Wi-Fi webased online diary system for Internet access that couldn't be traced to the hacker. Meanwhile, hackers have been known to monitor Wi-Fi webased online diary systems in order to steal financial data and account information.
The answer to Wi-Fi security may lie in "centralized" switches. Originally, Wi-Fi antennas were complex systems that might include webased online diary systeming and security in the same box with the antenna. This means that if a hacker could penetrate one box, entry might be gained to the entire webased online diary system. (Broch et al., 2007) This is extremely difficult to monitor and prevent in a corporation's building-wide system that might contain hundreds of antennas. Centralized Wi-Fi systems, being sold with great success by relatively new firms such as Aruba Webased online diary systems, Inc. and competitors Trapeze Webased online diary systems, Inc. and HP ProCurve (formerly Colubris Webased online diary systems), use webased online diary systems of simpler antennas, each containing a minimum of software and circuitry, all controlled from a sophisticated, very secure central switch. This concept greatly enhances security and eases maintenance and monitoring compared to previous generations of Wi-Fi antenna. In May 2008, Aruba products were incorporated in the first webased online diary system webased online diary system to achieve high security RESTRICTED level certification for connection to the U.K. Defense Fixed Webased online diary system.
As in virtually all webased online diary system technologies, the popular Bluetooth also has security issues to consider. Hackers practicing "bluesnarfing" or "bluebugging" may be able to locate and gather data from Bluetooth-enabled devices. However, the latest models of cell phones from makers such as Nokia have enhanced security measures in place, and software upgrades are often available for older devices in order to enhance security. Nonetheless, additional security concerns surfaced in U.S. news stories claiming that hackers with specially crafted receivers are able to eavesdrop on cell phone conversations on Bluetooth-webased online diary system headsets, or to capture data being transmitted by a Bluetooth-enabled laptop. The Bluetooth Special Interest Group is strongly recommending 16-digit alphanumeric security codes to be set by individual users; such lengthy codes would be much harder to crack than the short codes used by many devices today. (Perrig & Tygar , 2002)
In Japan, a number of webased online diary system companies are offering cell phone models equipped with cutting-edge biometric security devices. Fujitsu Ltd. makes a chip that is now embedded in DoCoMo phones that identifies a user's fingerprint. If the print does not match, the phone doesn't work. Other companies,