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Part VI Connecting Networks 195 has a 100-meter range, a properly connected tin can will boost the range to a kilometer! The reason for this is that the LAN signal is still traveling well past the 100- 16 meter range; it s just much weaker The can acts as an antenna, increasing your LAN Connecting Networks: card s sensitivity and enabling it to pick up the weaker signals Wireless With the right tools, even extremely short-range signals can be seen from a dis- Connections tance That s the theory behind TEMPEST, a technology that can show someone what s on your computer monitor from across the street It works by using an incredibly sensitive antenna to detect the electrical radiation coming from your video card Sci-fi Hardly Signals get weak, but they keep going until interference distorts the signal beyond comprehension The signals from the first radio broadcast ever are still traveling through the universe and have already reached star systems roughly 100 light-years away In fact, the SETI program is relying on this very fact to detect other life in the universe They hope to eventually detect faint radio signals generated by other civilizations If ET can eavesdrop on your data, what chance do you have to protect it against the average hacker who s much closer and much more likely to be listening Interference: The other evil side effect of the range problem is interference Two signals broadcasting at the same frequency will distort each other As a result, pandemonium can occur when multiple radio devices are broadcasting near each other at similar frequencies The problem is that many wireless technologies use similar frequencies For example, Bluetooth, Wi-Fi and newer cordless phones all operate at the 24 GHz range of frequencies When these devices are close enough to one another they can create interference issues Unfortunately, the likelihood of unavoidable proximity problems is high, because these devices are becoming fairly ubiquitous within the home and office environments Even unrelated systems can cause interference Microwave ovens, some types of lights, and various kinds of machinery can leak radiation in the 24 GHz range, causing interference There are a number of technological solutions for mitigating interference, including: use of different frequencies, use of spread spectrum technology, and intelligent avoidance algorithms Newer Wi-Fi technology is capable of operating in the 5 GHz range, which will help to avoid interference with other 24 GHz devices (until more devices move to 5 GHz) Bluetooth uses spread spectrum to minimize interference among other Bluetooth devices, but as the signal hops around it will hop in and out of bands used by Wi-Fi networks As a result, a Bluetooth device may cause a nearby Wi-Fi network connection to perform badly or completely fail Newer Bluetooth and Wi-Fi systems are being designed with intelligent broadcasting systems for avoiding interference These system monitor interference levels and adjust the way in which data is transmitted to minimize conflicts The problem is that intelligent algorithms make already complex systems even more complex Protocol weaknesses: Both Bluetooth and Wi-Fi technologies have flawed underlying security models Bluetooth security relies upon its short range, spread spectrum signal hopping, and encryption As we ve discussed, range can be boosted with the right equipment Similarly, it s not too difficult to reassemble a spread spectrum.

Symbian provides technologies to reduce the chances of exploitable buffer overflow conditions, but the programmer must take advantage of them For example, buffer overflows regularly result from mishandling data when copying, formatting, or concatenating strings and byte arrays To protect against such errors, Symbian C++ provides the descriptor framework to replace all C-style strings and the related string-handling operations They are called descriptors because each instance stores its type, length, and data, thus describing everything needed to safely manipulate the stored data Mutable descriptors (those whose name does not end with the letter C) also include the maximum length Figure 7-5 presents the relationships among the varied descriptor classes Descriptors come in both 8-bit-wide and 16-bit-wide varieties and can be identified by the number appended to the name (for example, TDesC8 and TBuf16) When a descriptor is used that includes neither a 16 nor an 8, the 16-bit version will be used (Technically a determination is made based on whether the _UNICODE macro is defined, which is the platform default) It is important to note that the type and the length are stored within a single 32-bit Tint field The four most significant bits indicate the type of the descriptor, and the remaining 28 bits represent the size of the referenced data This has several important consequences First, descriptors are limited to a maximum size of 256MB (228 bytes) Second, developers must be exceptionally careful deriving custom descriptor subclasses with regard to the type field The TDesC base class uses this field to determine the memory layout of its subclasses This means that custom subclasses cannot have an arbitrary memory layout, but must share a type and memory layout of a built-in descriptor It is not recommended to derive custom descriptor classes

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