Dell PowerVault ML6000 User's Manual

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written to tape. The Encryption Key Manager selects a pre-generated DK in round
robin fashion. DKs are reused on multiple tape cartridges when an insufficient
number of DKs have been pre-generated. The DK is sent to the LTO 4 or the LTO 5
tape drive in encrypted or wrapped form by the Encryption Key Manager. The
LTO 4 and LTO 5 tape drives unwrap this DK and use it to perform encryption or
decryption. However, no wrapped key is stored anywhere on the LTO 4 or the
LTO 5 tape cartridges. After the encrypted volume is written, the DK must be
accessible based on the alias or key label, and available to the Encryption Key
Manager in order for the volume to be read. Figure 1-3 illustrates this process.
The Dell Encryption Key Manager also gives you the ability to organize your
symmetric keys for LTO encryption into key groups. In this way, you can group
keys according to the type of data they encrypt, the users who have access to
them, or by any other meaningful characteristic. See “Creating and Managing Key
Groups” on page 3-14 for more information.
Encryption Key Processing by Other Applications
In application-managed tape encryption, unencrypted data is sent to the LTO 4 and
LTO 5 Tape Drives and converted to ciphertext using a symmetric DK provided by
the application, and is then written to tape. The DK is not stored anywhere on the
tape cartridge. Once the encrypted volume is written, the DK must be in a location
available to the application, a server database, for example, in order for the volume
to be read.
LTO 4 and LTO 5 Tape Drives can use applications such as Yosemite (for Dell
PowerVault TL2000 and TL4000 Tape Libraries), CommVault, and Symantec
Backup Exec for application-managed encryption.
Alternatively, LTO 4 and LTO 5 Tape Drives can be used by applications that use
the T10 command set to perform encryption. The T10 command set uses symmetric
256-bit AES keys provided by the application. T10 can use multiple, unique DKs
per tape cartridge, and even write encrypted data and clear data to the same tape
cartridge. When the application encrypts a tape cartridge, it selects or generates a
DK using a method determined by the application and sends it to the tape drive.
The key is not wrapped with an asymmetric public key and it is not stored on the
tape cartridge. Once the encrypted data is written to tape, the DK must be in a
location available to the application in order for the data to be read.
The process for application-managed and library-managed encryption tape
encryption is shown in Figure 1-3.
Clear
Data
E {data,DK}
sym
Encrypted
Tape
DK
Cipher
Tex t
a14m0236
Figure 1-3. Encryption Using Symmetric Encryption Keys. Library-Managed and Application-Managed Encryption on
LTO 4 and LTO 5 Tape Drives.
1-6 Dell Encryption Key Mgr User's Guide
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