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Microwave technologies developed in World War II secrecy, as the basis of many radar systems. After the war, they entered commercial use for radio, cooking, and radar. In 1951, AT&T began operations of the first transcontinental microwave radio system. Radio systems do not have as stringent a requirement for rights of way as do buried cables or telephone poles for wired systems. While there remained a need for coordination of radio frequency use to ensure noninterference among radio systems, there was much less argument to justify monopolies among microwave-based providers. Use of radio-based services in WANs has been cyclical: Microwaves provided a strong alternative to wired long-haul carriers, but optical fiber provides so much more bandwidth than microwave that it was able to displace microwave services. Other radio technologies, however, have become competitive with fiber. These technologies include mobile and fixed cellular, satellite, and niche wireless systems for remote areas. As competitive services became more reasonable as a business proposition, alternative carriers began to appear in the United States, initially in specialized niches. Electrical, gas, and railroad companies that had physical rights-of-way between cities began installing their own communications paths, initially for internal use. One such company was the Southern Pacific Railroad. There are various urban legends about what their service was called, but one version of folklore explains it as Southern Pacific Railroad Internal Network Technology

Changing anything in the database means many different changes have to be made to the user interface, greatly complicating maintenance Two of the primary objectives of object-oriented programming are code-reuse and data abstraction We all know and understand code reuse: Write the code once, and use it many different places Data abstraction is a bit more complex, but it s based on the notion that each layer of an application (data management, business logic, and user interface) should do what it does best, and not have to worry about other parts of the application The data layer should concern itself with getting data into and out of the data source The business logic should concern itself with the rules that drive the application, and the user interface presents data from the user and manages the application s interaction with the user.

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Other researchers quickly established the possibility of remote snooping on everything from fax machines through shielded RS-232 cables to Ethernet [719, 230] A few companies sprang up to sell jammers, but these are hard to implement properly [60], as they can interfere with TV and other services Military Tempest-shielded equipment remained unavailable to the commercial sector In any case, it is usually a generation out of date and five times as expensive as off-the-shelf PCs The view taken in the banking industry was, Well, we don t do it to our competitors, so they probably don t do it to us; and we don t know where to get effective countermeasures anyway, so put it in the too hard file.

This view got shaken somewhat in the late 1990s when HansGeorg Wolf demonstrated a Tempest attack that could recover card and PIN data from a cash machine at a distance of eight meters [239] However, Tempest precautions remain a rarity in commerce and in nondefense-sector industry1 Meanwhile, with the end of the Cold War, military budgets were cut, and often there was no alternative to using commercial off-the-shelf equipment; there was no longer the money to develop systems exclusively for government use Government organizations in NATO countries have switched to a zone model of Emsec protection, whereby the most sensitive equipment is kept in the rooms furthest from the facility perimeter, and shielding is reserved for the most sensitive systems (such as national intelligence) or where the threat is highest (such as in overseas embassies).

I-2.2

Nonetheless, the bill for Tempest protection in NATO government agencies comes to over a billion dollars a year A lower-cost protection technology, called Soft Tempest, has emerged and been deployed in some commercial products (such as the email encryption package PGP) [478] Soft Tempest uses software techniques to filter, mask, or render incomprehensible the information bearing electromagnetic emanations from a computer system Markus Kuhn and I discovered that most of the information bearing RF energy from a VDU was concentrated in the top of the spectrum, so filtering out this component is a logical first step We removed the top 30% of the Fourier transform of a standard font by convolving it with a suitable low-pass filter (see Figures 152 and 153) This turns out to have an almost imperceptible effect on the screen contents as seen by the user Figures 154 and 15.

Bundling all those operations behind or within a form violates the notion of data abstraction Every form in a bound application knows everything about the data managed by the form Although this works well in small applications where complete control over the data is relatively unimportant, larger, more ambitious applications generally require significant control over the data..

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