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The fundamental problem with physical identification devices is that they can be lost, stolen, or copied People lose things all the time Ever lose a wallet/purse Remember the miserable experience of canceling all your credit cards, getting a new license and then checking your credit reports just in case somebody used your information to open new accounts in your name (you did remember to do that, right )

security enabled, the COD file is signed using the RIM Signature Tool and the developer s signing keys For more details on BlackBerry code signing, see the section titled Permissions and User Controls

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A class knowing about another class is no different than a function defined in one C header file knowing about another function defined in a different header file For the first function to know about the other function, it must include the header file containing the second function Objective-C classes are no different, for one class to know about another, it must import the second class interface in its interface Notice that one class knowing about another does not require importing the header; instead, you might use a @class compiler directive The next section and subsequent Try This example illustrate how and why you use an @class compiler directive For now, just realize it is another way that one class can know about another

It s possible to duplicate some types of identifiers without ever touching the original Compromising a card reader is very effective, and often very easy Small sensor devices can be attached to a card swipe system These sensors can capture the information from magnetic strips as they are swiped through the reader Smart Cards are more difficult to hack the exchange of data occurs through electronic contact, not magnetically Furthermore, the exchange is encrypted Breaking the encryption is a complex process that takes hours Theoretically, it s possible to build a device that can capture the encrypted transaction for later analysis Other information, like the amount of power used by the reader and small amounts of electrical radiation escaping from the device, can also be used to break the encryption on a Smart Card Hacking a Smart Card in this manner requires powerful and sophisticated technology Of course, if the hacker can get a physical hold on the card for long enough, all of this becomes much easier to accomplish Anti-tamper features are built into Smart Cards, but they tend to fail and are often disabled Even with the features active, it s still possible to access unauthorized information For example, the chip can be removed from the card and hooked up to common electronics testing equipment that can read data directly from the memory, bypassing all of the security features Advanced cards such as Java Cards can be directly attacked by rogue card reader systems The Java operating system or applications may have implementation glitches that can be exploited Conversely, a rogue Java Card could be used to attack a card reader, installing a backdoor by exploiting vulnerabilities in the reader system Future combination cards will include fingerprint scanning and other userverification systems to minimize fraud

The RIM BlackBerry simulator (aka fledgeexe) emulates all BlackBerry functionality Convienently, the simulator and images are bundled with both the Eclipse plug-in and the JDE or are downloadable as a separate package The simulator natively supports

Sometimes class relationships are not a one-to-one relationship such as in Figure 4-7 A class might have a relationship with multiple classes For instance, an AcademicDepartment has multiple Professors; therefore, an AcademicDepartment aggregates Professors (Figure 4-8) In this situation you would use a data structure such as an array, NSArray, or NSDictionary to implement the relationship For more information on aggregation, refer to UML Demystified

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