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} // So we've driven it this proportion of the way round double proportionOfWholeCircle = d / circum; // Once round is 360 degrees (or 2pi radians), so we have traveled CurrentOrientation = CurrentOrientation + (Math.PI * 2.0 * proportionOfWholeCircle); // return true; (This is now redunant, so you can delete it)

// And we're going backwards if the motors are reversed d *= 1.0;

he exercises in this section will help test your understanding and give you some practical experience with the topics covered in s 12 through 15. If you have been reading through all the chapters in this book, and you complete all (or at least most) of the exercises, including the ones listed here, you will be well on your way toward being a security-conscious programmer! 1. Smarti Pants Hellerstein is a software developer who believes he can improve the security of DES by changing how its internals work. Should he do it Provide three reasons why he should or should not implement his ideas in his company s production system that supports 10 million users. 2. List three differences between AES and Triple DES. 3. In Table 16-1, label each of the algorithms as one or more of the following: (a) symmetric encryption algorithm, (b) asymmetric encryption algorithm, (c) hash algorithm, (d) stream cipher, or (e) block cipher. Also specify how many inputs each takes, whether the inputs must be a required size or if they are variable, what number of bits the inputs are expected to be, and what the output number of bits is. Note that we may not have covered all of this information in the text. You are encouraged to consult any security text or the Web to complete the chart. Table 16-1. Taking Stock of Crypto Primitives Exercise

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Notice that we changed the return specification back to void, and removed the unnecessary return at the end. The interesting bit, though, is in our test at the beginning of the method.

The quick tests at the beginning of the method are sometimes called guard clauses or guards. Unless performance is more important to your application than correct operation (and it usually isn t), it is a good idea to check these preconditions before you attempt to execute the method. Sometimes you will also want a similar set of post-condition tests on exit from the method, to verify that your state is still valid at the end of the operation. The design-by-contract development philosophy requires you to specify these pre- and post conditions as a part of your method contract, and some languages such as Eiffel support declarative specification of these conditions. Microsoft Research is working on an extension of C# called Spec# which includes some of these design-by-contract features. You can read about it at http://research.mi crosoft.com/en-us/projects/specsharp/.

Rather than return an instance of an enum, we throw an instance of the InvalidOpera tionException class.

to be used when an operation fails because the current state of the object itself doesn t allow the method to succeed (rather than, say, because a parameter passed in to the method was incorrect). That seems to fit this case quite nicely, so we can make use of it.

The goal of non-repudiation is to ensure undeniability of a transaction by any of the parties involved. A trusted third party, such as Trent, can be used to accomplish this. For example, let us say Alice interacted with Bob at some point, and she does not want Bob to deny that she interacted with him. Alice wants to prove to some trusted third party (i.e., Trent) that she did communicate with Bob. If, for instance, Alice sent a payment for a bill to Bob over the Web, she may want her payment to be non-repudiable. That is, she does not want Bob to be able to deny that he received the payment at some later point for any reason. Alice, for example, may feel comfortable sending money to Trent, but not directly to Bob. Bob also trusts Trent. Trent may say to Bob, Yes, Alice gave me the $500, so you can ship her the goods, and then I will pay you. In such an example, Trent is playing the role of an escrow agent, but trusted third parties may be able to serve in many other types of trusted roles

Back before C# 3.0, you could throw an instance of any type you liked (e.g., a string). In C# 3.0, a constraint was added that only types derived from Exception can be thrown.

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