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Cryptography is a fascinating area, and, if it interests you, you can easily spend hours, days, or years reading about different options and experimenting with them. There are a few extra items you can pursue in MediaGrabber to make it more secure for your users. Allow the user to enter her own key that will be used for encryption instead of using a hard-coded one. Extra credit: Generate a strong key based on text that she enters (e.g., generate a value like 0x42FAAB783C10CE77 from the password tristero.) Super extra credit: Securely store the user s key so she doesn t need to type it in every time she sends an encrypted message. Add support for multiple ciphers to the app, such as AES, TripleDES, and RC5. Allow the user to select which encryption method to use when sending. Keep in mind that this also will require support for multiple key sizes. Make your app as secure against hackers as you can. Conceal your key within the .cod file. Experiment with ways to generate key values that also allow the receiver to figure out the key. Program security requires constant vigilance, so completing these exercises will help you develop the mindset of constant paranoia and inquisitiveness that will help you discover flaws before they can be exploited.
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Choices abound in the world of security. The rich resources of the built-in RIM crypto libraries and the free offerings of Bouncy Castle make it very unlikely that you will ever find yourself lacking crypto options. The bigger challenge is to make sense of what s out there and pick what makes the most sense for your app. If your app is for personal use or you just want to discourage potential hackers, very little is needed. Applying even the
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CHAPTER 5: Cryptography
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simplest cipher will deter the vast majority of abusers, who will move on to easier targets. However, if you are responsible for crafting a system that manages people s money, personal information, or sensitive data, you must fulfill the mission of protecting that trust. Involve others, consult experts, and make sure your app is reviewed and tested. Please keep in mind that the examples in this chapter included hard-coded keys for maximum readability, but this will rarely be used in true applications. Consider whether each user will need their own key, and if so, how to distribute them. Think about whether you can algorithmically generate a key, and if you can, how to ensure both parties stay in sync. Security through obscurity is a persistent enemy of good design. Too many people convince themselves that, by not talking about how their app works, they are protecting against intrusion. You will know your app is secure if you can tell someone every detail about how it works and still know that they will not be able to crack it. Fortunately, simply by thinking about these issues, you already have a head start on many other developers. Not to mention, you have more than a head start on using advanced BlackBerry APIs you have completed the race! Part 1 of this book has provided you with the tools for creating feature-rich applications that exploit the best built-in capabilities of BlackBerry devices. Up until this point, our apps have been growing upward, gaining new functionality. Next, we will turn out focus inward and start exploring ways to more tightly integrate with other systems on the device.
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Device Integration
You now have the tools to make a useful and interesting mobile BlackBerry app. If you re lucky, lots of people will get it and it will sit in the Downloads folder or at the bottom of their home screen. It may be great while people are using it, but even the best app becomes forgettable if people don t see it often. This next section focuses on integration, the process of connecting your app with other powerful apps and features on the device. You will gain access to the user s personal address book, calendar, and more, so that you can access information and provide new updates. You will learn how to use the BlackBerry web browser in your app, and use your app in the BlackBerry web browser. Finally, you will learn how to elevate your app to the level of a first-class application, capable of providing services to other apps on the phone and displaying custom icons from the BlackBerry menus. By the end of this part, your apps won t just have more features: they ll also be irresistible. Obtaining this level of polish and mutual cooperation with built-in device applications can turn your app from something you download into a part of your daily routine.
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