Lesson 2 in Visual Basic .NET

Painting QR Code ISO/IEC18004 in Visual Basic .NET Lesson 2

Lesson 2
Encoding Quick Response Code In VB.NET
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1. Correct Answers: A and B A. Correct: You can control access to files using the FileSecurity class. B. Correct: You can control access to registry keys using the RegistrySecurity class. C. Incorrect: The .NET Framework does not provide libraries for configuring printer permissions. D. Incorrect: The .NET Framework does not provide libraries for configuring share permissions.
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Answers
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2. Correct Answer: A A. Correct: To apply ACL changes to a folder, call Directory.SetAccessControl. This method requires two parameters: the directory and the DirectorySecurity object containing the ACLs. B. Incorrect: Although you can create a new directory by specifying a DirectorySecurity object, in this example, the directory must exist already for the code to work properly. C. Incorrect: You must provide both a path and a DirectorySecurity object to Directory.SetAccessControl. D. Incorrect: Although you can create a new directory by specifying a DirectorySecurity object, in this example, the directory must exist already for the code to work properly. In addition, you cannot create a directory by specifying only a DirectorySecurity object. 3. Correct Answer: B A. Incorrect: RegistryAccessRule describes a DACL for a registry key. B. Correct: RegistryAuditRule describes an SACL for a registry key. C. Incorrect: AccessRule is the base class for all DACLs. D. Incorrect: AuditRule is the base class for all SACLs. However, it is not specific to registry keys. RegistryAuditRule inherits from AuditRule and specifically describes registry key SACLs. 4. Correct Answer: C A. Incorrect: DirectorySecurity.GetAccessRules returns an instance of AuthorizationRuleCollection containing FileSystemAccessRule objects. B. Incorrect: DirectorySecurity.GetAccessRules returns an instance of AuthorizationRuleCollection containing FileSystemAccessRule objects. C. Correct: DirectorySecurity.GetAccessRules returns an instance of AuthorizationRuleCollection containing FileSystemAccessRule objects. D. Incorrect: Although you could iterate through an instance of AuthorizationRuleCollection using AuthorizationRule objects, you would not have access to important elements of file system ACLs. Instead, you should use FileSystemAccessRule, which derives from AuthorizationRule.
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Lesson 3
Paint Data Matrix In Visual Basic .NET
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1. Correct Answers: B, C, E, and F A. Incorrect: The RSACryptoServiceProvider class provides asymmetric encryption, which requires the encryptor and decryptor to have related, but different, keys. B. Correct: The RijndaelManaged class provides symmetric encryption, which requires the encryptor and decryptor to have the same key. C. Correct: The TripleDES class provides symmetric encryption, which requires the encryptor and decryptor to have the same key. D. Incorrect: The DSACryptoServiceProvider class provides asymmetric digital signing, which requires the encryptor and decryptor to have related, but different, keys. E. Correct: The DES class provides symmetric encryption, which requires the encryptor and decryptor to have the same key. F. Correct: The RC2 class provides symmetric encryption, which requires the encryptor and decryptor to have the same key. 2. Correct Answers: A, C, and D A. Correct: SymmetricAlgorithm.Key must be the same on both the encryptor and decryptor. B. Incorrect: Symmetric encryption algorithms do not use a salt. Salts are used when creating keys from passwords using the Rfc2898DeriveBytes class. C. Correct: SymmetricAlgorithm.IV must be the same on both the encryptor and decryptor. D. Correct: SymmetricAlgorithm.Mode must be the same on both the encryptor and decryptor. 3. Correct Answer: C A. Incorrect: When transferring data across a network, you need to export only the public key. Because you can create new keys for future network sessions, there is no need to save the private key. B. Incorrect: If you are decrypting a file encrypted by a remote computer, you should provide the remote computer your public key. You do not need to export your private key.
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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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