Blackberry ENTERPRISE SOLUTION SECURITY - ENFORCING ENCRYPTION OF INTERNAL AND EXTERNAL FILE SYSTEMS ON DEVICES Guia do Utilizador descarregar pdf (Página 47)

Scrubbing the user files on a BlackBerry device when deleting all BlackBerry device data

If a BlackBerry® device supports a partition of flash memory to store files that a user saved to the on-board device memory and

you or a user turned on content protection, the memory scrub process overwrites that section of the BlackBerry device memory

by writing a single character before the memory scrub process deletes the data. The memory scrub process performs the following

actions:

1. writes 0x55 to each byte (0101 0101

)

2. writes 0xAA to each byte (1010 1010

)

3. deletes all blocks, and changes all bytes to 0xFF (1111 1111

) or 0x00 (0000 0000

)

Security Technical Overview

Scrubbing the memory of a BlackBerry device when deleting all BlackBerry device data

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Blackberry ENTERPRISE SOLUTION SECURITY - ENFORCING ENCRYPTION OF INTERNAL AND EXTERNAL FILE SYSTEMS ON DEVICES Guia do Utilizador Página 47