create qr barcode c# Combining Asymmetric Signing and Hash Algorithms in .NET framework

Encoding QR in .NET framework Combining Asymmetric Signing and Hash Algorithms

Combining Asymmetric Signing and Hash Algorithms
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Most applications that perform digital signing use a combination of asymmetric signing and hash algorithms. While the hash algorithm provides a mechanism to determine whether the original message has been modified in any way, the addition of a digital signature protects the resulting digest from modification and proves that the digest was created by the originator of the data. Figure 1-5 shows the interaction of hash algorithms and asymmetric signing in the digital signing process:
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1 Digest Function Plain Text 2 Digest 3 Encrypted Digest Private Key
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4 6 Digest Compare 7 5 Digest Encrypted Digest Public Key Digest Function Plain Text Encrypted Digest
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Figure 1-5
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Digital signing with asymmetric signing and hash algorithms
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1. The originator creates a plaintext data file. 2. The originator s software runs a hash algorithm against the plaintext message to create a message digest. 3. The digest is encrypted using the originator s private key. 4. The plaintext message and the encrypted digest are sent or made available to the recipient.
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Part I:
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Note When using digital signing, no encryption is applied to the plaintext data. The plaintext can be modified, but modification invalidates the encrypted digest sent with the message.
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5. The recipient decrypts the encrypted digest by using the sender s public key. The public key can be retrieved from a directory where the public key is stored (such as Active Directory) or included with the signed data. 6. The recipient runs the same hash algorithm used by the sender to create his or her own digest of the message. This digest is created against the plaintext message received from the originator. 7. The two digests are compared. If the digests differ, the message or digest has been modified during transmission.
Case Study: Microsoft Applications and Their Encryption Algorithms
In this case study, you will research the encryption and hash algorithms supported by Encrypting File System (EFS). The research involves reviewing white papers available on the Internet (or the compact disc that accompanies this book if you do not have Internet connectivity).
Opening the EFS White Paper
Use the following procedure to open the Encrypting File System in Windows XP and Windows Server 2003 white paper: 1. Insert the accompanying compact disc in your CD-ROM drive. 2. Open Windows Explorer. 3. Open the folder CD:\Case Studies\1\. 4. In the CD:\Case Studies\1 folder, double-click Encrypting File System in Windows XP and Windows Server 2003.htm.
Note Alternatively, you can locate the Encrypting File System in Windows XP and Windows Server 2003 white paper at www.microsoft.com/technet /prodtechnol/winxppro/deploy/cryptfs.mspx.
1:
Basics of Cryptography
5. From the Edit menu, click Find (on This Page). 6. In the Find dialog box, in the Find What box, type Default Encryption Algorithm and click Find Next. 7. In the Find dialog box, click Cancel.
Case Study Questions
1. Based on the encryption algorithms discussed in the Default Encryption Algorithms section of the white paper, does EFS use symmetric or asymmetric encryption 2. What encryption algorithm is used to encrypt EFS data on a Windows 2000 workstation 3. What encryption algorithms can be used to encrypt EFS data on Windows XP 4. How does the application of Windows XP, Service Pack 1, affect EFS encryption 5. What Group Policy setting enables the use of 3DES and AES encryption algorithms 6. What asymmetric encryption algorithm is used to protect the File Encryption Key (FEK) in EFS 7. A developer in your organization has a laptop that dual boots between Windows 2000, Professional, and Windows XP, Professional. Both operating systems have the latest service packs and security updates. The user s Outlook data file is encrypted, and the same EFS key pair is used in both operating systems to provide access to the Outlook data file. This morning, your developer was unable to access the Outlook data file when working in Windows 2000, but you are still able to create new encrypted files. Fearing that the Outlook data file was corrupt, he booted into Windows XP and was able to access the data file. What is the probable cause of this problem
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