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C. Correct: If you need to decrypt a file at a later time, you must export the private key. D. Incorrect: If you are sending a file to a remote computer, you should encrypt it with the remote computer s private key. You do not need to generate or export encryption keys at all. 4. Correct Answers: B and D A. Incorrect: RIPEMD160 is a nonkeyed hashing algorithm. B. Correct: HMACSHA1 is a keyed hashing algorithm. C. Incorrect: SHA512 is a nonkeyed hashing algorithm. D. Correct: MACTripleDES is a keyed hashing algorithm. E. Incorrect: MD5 is a nonkeyed hashing algorithm.
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12: Case Scenario Answers
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Case Scenario 1: Creating Custom Authentication Methods
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1. Use GenericIdentity and GenericPrincipal because the simple relationship between users and groups used by the accounting application does not require you to create custom classes based on IIdentity and IPrincipal. 2. Use declarative RBS demands to restrict access to AddBill. As long as a user is authenticated and is a member of one of the Temps, Accountants, or Managers group, the user can use that method. 3. Use declarative RBS demands to restrict access to authenticated members of the Accountants or Managers group. Within the method, use the GenericPrincipal.IsInRole method to verify that the user is a member of the Managers role if the value of the bill being paid is $1,500 or higher.
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Case Scenario 2: Protecting Data by Using Cryptography
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1. Both symmetric and asymmetric encryption can meet the requirements, but symmetric encryption is the best choice because it minimizes administrative overhead. You can use symmetric key encryption because the data will be transferred between relatively stable computers in remote offices, and because configuring each with a secret key would be easy. Alternatively, you can use asymmetric encryption, configure a key pair at the centralized database, and distribute the public key to each of the remote offices. The application could then use asym-
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Answers
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metric encryption to establish session keys to enable symmetric key encryption during the data transfers. 2. At the very least, you should store hashes of the password. A keyed hashing algorithm would be more secure than a nonkeyed algorithm. Your primary deterrence must be preventing attackers from gaining access to the password database, however. 3. You should use digital signatures. Store a key pair at the central office, and distribute the public key to each of the remote offices. Sign all bonus communications with the private key, and then verify the signature at the remote offices.
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13: Lesson Review Answers
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Lesson 1
1. Correct Answers: A, B, and D A. Correct: Adding a reference through Visual Studio 2005 will automate all the actions that are necessary to import a COM Library. B. Correct: TlbImport.exe allows you to import the type, although it s a command-line utility and generally considered less convenient than adding a reference. C. Incorrect: Regsrv registers a COM component, and used alone it does nothing for a .NET application. D. Correct: By using the Regsvr tool, you can first verify that a COM component has been properly registered. Afterward, either of the two methods will successfully import it. 2. Correct Answers: C and D A. Incorrect: Trapping an ApplicationException object will trap only CLS-compliant applications specific to that application. B. Incorrect: Setting the RuntimeCompatibilty attribute to false will turn off the default behavior, which will cause System.Exceptions to be caught only if they are CLS compliant. C. Correct: Trapping System.Exception will trap both CLS-compliant and nonCLS-compliant exceptions.
Answers
D. Correct: This would be unnecessary because this feature is enabled by default, but it would allow System.Exception to catch both CLS-compliant and non-CLS-compliant exceptions. 3. Correct Answers: A, B, C and D A. Correct: All members of COM objects have to be implemented as instance members as opposed to static or shared members. In the .NET Framework, there is extensive use of shared/static members, so there stands to be a great behavior difference between objects created in each environment. B. Correct: COM does not provide support for parameterized constructors whereas the .NET Framework does. C. Correct: COM objects must be registered in the Windows registry. This is not available in other operating systems. D. Correct: COM flattens the inheritance chain and as such, places significant restrictions on what can be done with inheritance. 4. Correct Answers: A, C, and D A. Correct: This will allow you to view the Intermediate Language instructions issued after a COM component has been imported. B. Incorrect: While this tool is very powerful, it provides no facility to manage COM Interop. C. Correct: This tool will allow you to import COM components and change the name they ll be imported as. D. Correct: Since all COM components must be registered properly (which entails Windows registry entries), this tool enables you to view what has been entered into the Windows registry.
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