Lesson Summary in VB.NET

Maker QR Code JIS X 0510 in VB.NET Lesson Summary

Lesson Summary
Drawing Quick Response Code In VB.NET
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Reading QR Code In Visual Basic .NET
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Symmetric key encryption is a cryptographic technique for protecting the privacy of data in situations where both the encryptor and decryptor have access to the same secret key. There are four symmetric algorithm classes in the .NET Framework: RijndaelManaged, DES, TripleDES, and RC2. The primary disadvantage of symmetric key encryption is that you have to transfer the key between the sender and receiver, and the key can be very complex. Alternatively, you can generate a key based on a user password by using the Rfc2898DeriveBytes class. Asymmetric key encryption is a cryptographic technique for encrypting data using key pairs, in which one key performs the encryption, and the other key must be used to perform decryption. There are two asymmetric algorithm
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Decoding Bar Code In Visual Basic .NET
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Lesson 3: Encrypting and Decrypting Data
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classes in the .NET Framework: RSACryptoServiceProvider and DSACryptoServiceProvider (used only for creating digital signatures). Hashes process a file and produce a unique key that can be used to validate the integrity of the file. If the file is modified in any way, a different hash results. Therefore, hashing is useful when you want to ensure that a file has not been changed. Digital signatures enable you to use a public key to verify that a file is signed with a private key. In environments with a public-key infrastructure, you can use digital signatures to verify that a specific user created a file.
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Create Bar Code In Visual Basic .NET
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Lesson Review
QR Code JIS X 0510 Drawer In VB.NET
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Print PDF-417 2d Barcode In VB.NET
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You can use the following questions to test your knowledge of the information in Lesson 3, Encrypting and Decrypting Data. The questions are also available on the companion CD if you prefer to review them in electronic form.
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Encode British Royal Mail 4-State Customer Barcode In VB.NET
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NOTE
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Answers
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Answers to these questions and explanations of why each answer choice is right or wrong are located in the Answers section at the end of the book.
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1. Which of the following classes requires both the encryptor and decryptor to have the same key (Choose all that apply.) A. RSACryptoServiceProvider B. RijndaelManaged C. TripleDES D. DSACryptoServiceProvider E. DES F. RC2 2. Which of the following must be synchronized between the encryptor and decryptor when using symmetric encryption (Choose all that apply.) A. SymmetricAlgorithm.Key B. SymmetricAlgorithm.Salt C. SymmetricAlgorithm.IV D. SymmetricAlgorithm.Mode
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Quick Response Code Generation In Java
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12
User and Data Security
3. Under which circumstances should you export the private key from an asymmetric encryption algorithm A. When transferring data across a network for a single session B. When a remote computer will be sending you a private file that you must be able to decrypt C. When you are encrypting a file that needs to be read later D. When you are sending a remote computer a private file that the remote computer must be able to decrypt 4. Which of the following are keyed hashing algorithms (Choose all that apply.) A. RIPEMD160 B. HMACSHA1 C. SHA512 D. MACTripleDES E. MD5
12 Review
Review
To practice and reinforce the skills you learned in this chapter further, you can perform the following tasks: Review the chapter summary. Review the list of key terms introduced in this chapter. Complete the case scenarios. These scenarios set up real-world situations involving the topics of this chapter and ask you to create a solution. Complete the suggested practices. Take a practice test.
Summary
Use role-based security (RBS) to control which users can access which aspects of your application. You can base RBS on the local Windows user database, an AD DS domain, or a custom user database. Discretionary access control lists (DACLs) define which users can access which objects, whereas security access control lists (SACLs) define what logging is performed when users attempt to access a file. You can use classes in the System.Security.AccessControl namespace to view and manipulate both types of ACLs. The cryptography classes in the System.Security.Cryptography namespace enable you to encrypt and decrypt data (using either symmetric or asymmetric algorithms), validate data (using hashing), and sign data (using digital signatures).
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