Blackberry ENTERPRISE SOLUTION ENFORCING Manuel - Sayfa 10

Yazılım Blackberry ENTERPRISE SOLUTION ENFORCING için çevrimiçi göz atın veya pdf Manuel indirin. Blackberry ENTERPRISE SOLUTION ENFORCING 11 sayfaları. Enforcing encryption of internal and external file systems on blackberry devices

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Enforcing encryption of internal and external file systems on BlackBerry devices

Controlling access to objects in external memory

The BlackBerry device is designed to permit code signing keys in the header information of each encrypted file

on the external memory device. The BlackBerry device is designed to check the code signing keys when the

BlackBerry device opens the input or output streams of the encrypted files.

The BlackBerry device, any computer platform, and other devices that use the external memory device can

modify encrypted files (for example, truncate files) on the external memory device. The BlackBerry device is not

designed to perform integrity checks on the encrypted file data.

Protecting master encryption keys on a locked BlackBerry device

If you turn on content protection of master encryption keys, the BlackBerry device uses the grand master key to

encrypt the master encryption keys stored in flash memory and encrypts the grand master key using the content

protection key. When the BlackBerry device receives data encrypted with a master encryption key while it is

locked, it uses the decrypted grand master key to decrypt the required master encryption key in flash memory,

and uses the decrypted master encryption key to decrypt and receive the data.

The BlackBerry device stores the decrypted master encryption keys and the decrypted grand master key in RAM

only. When you, the BlackBerry device user, or a set password timeout locks the BlackBerry device, the wireless

transceiver remains on and the BlackBerry device does not clear the RAM associated with these keys. The

BlackBerry device is designed to prevent the decrypted grand master keys and the decrypted master encryption

keys from appearing in flash memory.