barcode reader integration with asp net

barcode reader integration with asp net

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When an application accesses an encrypted file, decryption proceeds as follows: 1. NTFS recognizes that the file is encrypted and sends a request to the EFS driver. 2. The EFS driver retrieves the DDF and passes it to the EFS service. 3. The EFS service retrieves the user s private key from the user s profile and uses it to decrypt the DDF and obtain the FEK. 4. The EFS service passes the FEK back to the EFS driver. 5. The EFS driver uses the FEK to decrypt sections of the file as needed for the application. Note When an application opens a file, only those sections of the file that the application is using are decrypted because EFS uses cipher block chaining. The behavior is different if the user removes the encryption attribute from the file. In this case, the entire file is decrypted and rewritten as plaintext. 6. The EFS driver returns the decrypted data to NTFS, which then sends the data to the requesting application. Figure18-4 illustrates the process of obtaining the user s private key from the user s profile, using it to decrypt the FEK, and using the FEK to decrypt the data for a user.

If you click the Phone tab, you can enter any phone numbers that you want your contacts to be able to see. Of course, you should not enter any information on this tab unless you explicitly want to share phone numbers with all of your contacts. Also, make sure you never give out passwords, credit card numbers, or any other personal information over instant messaging because the link, although private, does not encrypt data and is not considered secure.

User's Private Key From User's Profile Encrypted File DDF Contains FEK Encrypted with User's Public Key DRF (if a data recovery agent has been designated) Ciphertext (Encrypted Data) "*(d3ca&&1/!p94882aAA" DDF +User's Private Key Decrypts FEK Decrypted Data FEK + Ciphertext "The quick brown fox jumped over..."

Figure 18-4

Part III:

8

When encrypting files, it is best to turn on encryption for folders rather than to encrypt files individually. By using encrypted folders, you do not have to encrypt each file when you save it. This also ensures that any temporary or backup files that the application creates remain encrypted during and after editing, provided that the application does its editing in the same folder. When files or folders are encrypted or decrypted, the date and time stamps on the files and folders are updated to the current date and time. Note Applications do not always use the same folder for temporary files or backup files. Microsoft Word, for example, uses the folder where the encrypted file is located for temporary and backup files but can be configured to use alternate folders. Also, if EFS is appropriate for a specific user, it is a good practice to encrypt the user s My Documents folder because many applications use this folder as the default location to save files. Remember, though, that no files or directories in roaming profiles can be encrypted.

Applying encryption to a folder by using My Computer is simply a matter of assigning an attribute. To apply encryption to a folder by Using My Computer 1. In My Computer, select the folder to encrypt. 2. Right-click the folder and click Properties. 3. On the General tab, click the Advanced button. 4. Select the Encrypt contents to secure data check box, and then click OK. When you click OK, if the folder contains unencrypted files or subfolders, another dialog box appears to ask you whether you want to apply the changes to just the folder or to the folder, its subfolders, and all files. Table 18-1 shows the results of selecting the Apply changes to this folder only option.

Table 18-1