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For more information about the decryption process, requirements, and procedures, see Encrypting and Decrypting by Using EFS earlier in this chapter. For more information about remote EFS operations, see Remote EFS Operations in a File Share Environment earlier in this chapter.

Now we try to open the + file in order to write to it; if there's an error, we let the user know: public boolean action (Event e, Object o){

If you are unable to open an encrypted file, you might not have the correct EFS certificate and private key for the file. If the file is old, the public key and private key set might no longer be available. Although expired certificates and private keys are archived, users can delete archived certificates and private keys, or they can be damaged. If this has occurred, you can recover the file.

if(etargetequals(button1)){

18:

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This problem can also occur when a computer that previously operated in stand-alone mode is now a member of a domain. The file might have been encrypted by a local self-signed certificate issued by the computer, but the CA designated at the domain level is now the issuing authority. To access a file that was encrypted while the computer was in stand-alone mode, log off, and then log back on to the local computer instead of the domain. The same conditions apply for encrypting and decrypting remote files. The user s profile must be available for EFS to use, the computer must be trusted for delegation, and the user s account must be enabled for delegation. For information about how to recover files, see Recovering Encrypted Files earlier in this chapter. For more information about encryption and decryption processes, requirements, and procedures, see Encrypting and Decrypting by Using EFS earlier in this chapter. For more information about remote EFS operations, see Remote EFS Operations in a File Share Environment earlier in this chapter.

if(etargetequals(button2)){

The public key certificate is not used for decryption because it does not contain the private key. However, if a file cannot be decrypted, you can determine who is authorized to access the file and which certificate and public key were used to encrypt the file. This information is listed in the Encryption Details dialog box under a file s advanced properties. When you determine whether the user has been authorized to access the file, you can determine what certificate was used to encrypt the file. Then you can determine whether the certificate is still available. If the certificate is not available, the private key will not be available and the user will not be able to decrypt the file. If the certificate is available, the user might have exported the private key and deleted it from the computer. To view authorized users and certificate thumbprint information 1. Right-click the encrypted file and then click Properties. 2. On the General tab, in the Attributes section, click Advanced. 3. In the Advanced Attributes dialog box, click Details to open Encryption Details. Users who are authorized to access the file are listed under Users Who Can Transparently Access This File. The thumbprint for the certificate used to encrypt the file is listed with the name of the authorized user. Note that any data recovery agents are listed as well.

if(etargetequals(button3)){

Part III:

FileOutputStream outstream = null;

To compare the certificate thumbprint associated with the encrypted file with other certificate thumbprints 1. Open the Certificates snap-in, and locate the user s certificates. 2. Double-click a certificate, and then click the Details tab. The certificate thumbprint is one of the listed details. 3. Compare the certificate thumbprint associated with the encrypted file with the thumbprints of each of the user s EFS certificates.

If the user who wants to access the file is not listed in Users Who Can Transparently Access This File, the user has not been authorized to access the file or has been deleted from the authorized user list. You can then determine whether the user is supposed to be authorized to access the file. If the user is already authorized to access the file, you can compare the certificate thumbprint listed next to the users name with thumbprints of the user s certificates in the Certificates snap-in.

try {

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