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3. Before a user can be authorized to access an encrypted file and be added to the file, EFS needs to determine whether the certificate can be trusted. When a user s certificate is selected, EFS attempts to validate the certificate chain. If the chain validation fails, CryptoAPI also checks to see whether the certificate is in Trusted People store. If it is not, the certificate cannot be used. Imported self-signed certificates are automatically placed in Trusted People, and there is no certificate chain to validate, so the user can be added to the encrypted file. If the certificate was signed by a CA, EFS attempts to build a certification chain and validate the certificate. If the chain ends with an untrusted root CA, EFS will not use the certificate and the user is not added to the file. If the user s EFS certificate is signed by a CA and includes information about certificate revocation list (CRL) distribution points, EFS attempts to connect with the distribution points to check for certificate revocation. If a CRL distribution point cannot be reached, the certificate will not be used, even if the root is trusted. Finally, if the EFS certificate is signed by a CA, the CA is trusted, and the CA does not use CRL distribution points, EFS accepts the certificate and adds the user. 4. For the next part of the process, assume that Alice already has access to the encrypted file. She is either the original encryptor, or she has been authorized for access. Alice is authorizing Bob to access the file. 5. EFS obtains Alice s private key from her user profile to decrypt the file encryption key (FEK) contained in the file s data decryption field.

int currentRecordNumber = 0;

Part III:

int maxRecordNumber = 4;

6. EFS obtains Bob s public key from his certificate and uses it to encrypt the FEK. 7. Bob s encrypted FEK is stored in a new data decryption field with the file. Note

At no time in this process is the file itself decrypted, so it is not at risk directly. However, the FEK is briefly decrypted. Because EFS performs this operation in nonpaged memory, the decrypted FEK is never paged and so is never exposed.

public static void main(String args[])

Alice's User Profile Contains Her Private Key Alice's Private Key Local Certificate Stores OR Active Directory Contains Bob's Certificate Bob's Certificate and Private Key

birdsFrame frame = new birdsFrame("The birds application");

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Alice's Private Key From User Profile File Before Sharing DDF Contains FEK Encrypted with Alice's Public Key Optional DRF Encrypted Data Unencrypted FEK Encrypted FEK + Alice's Private Key

frameshow();

File After Sharing DDF Contains FEK Encrypted with Alice's Public Key DDF Contains FEK Encrypted with Bob's Public Key Optional DRF Encrypted Data

Figure 18-7

framehide();

18:

frameresize(330, 320);

It is important that users electing to share encrypted files keep the following points in mind: 1 Shared EFS files are not file shares If authorized users need to access shared EFS files over the network, a file share or Web folder is required Alternatively, users could establish remote sessions with computers that store encrypted files by using Terminal Services 2 Any user who is authorized to decrypt a file can authorize other users to access the file Granting access is not limited to the file owner Caution users to share files only with trusted accounts, because those accounts can authorize other accounts Removing the Write permission from a user or group of users can prevent this problem, but it also prevents the user or group from modifying the file 3 EFS sharing requires that the users who will be authorized to access the encrypted file have EFS certificates.

These certificates can be located in roaming profiles or in the user profiles on the computer on which the file to be shared is stored, or they can be stored in and retrieved from Active Directory 4 EFS sharing of an encrypted file often means that the file will be accessed across the network It is best if Web folders are used for encrypted file storage whenever possible For more information about using Web folders to share encrypted files, see Remote EFS Operations on File Shares and Web Folders earlier in this chapter 5 If a user chooses to remotely access an encrypted file stored on a file share and to authorize other users to access the file, the authorization process and requirements are the same as on the local computer.

birds applet = new birds();

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