Tuesday, November 20, 2012

Mobile Flash Data Erasure

Mobile Flash Data Erasure

Secure your smartphone and tablet

                                                  Photo courtesy of Blancco

The growth in smart phones naturally means consumers will see even more utilities and tools similiar to those found on PCs, laptops and notebooks etc. A trend that is growing in relation to cleansing of personal details and company information stored logically and physically is called mobile flash data erasure (MFDE).

Service erasure
A group called www.tabernus.com/ promote "Tabernus also provides erasure solutions for Mobile Phones, USB, SSD (solid state devices) & other types of Flash removable memory and may other data holding devices too!"

Software erasure
Of course, there is a comparison for mobile phone flash erasure available from  http://www.blancco.com/us/erase-smartphones/

The above examples are in addition to hardware encryption:

Device specific denied data access
Hardware Encryption: The iPhone 3GS and later, and all iPads, support built-in hardware encryption. All user data can be automatically encrypted in hardware at all times. This is used primarily for wiping the device rather than to stop attacks. Erasing the entire flash storage would be slow, so instead wiping works by destroying the encryption key, which instantly makes all user data inaccessible (Securosis).

And flash memory management:

Flash Memory Management Systems
Wear leveling ( http://en.wikipedia.org/wiki/Wear_leveling ) as well routines used in garbage collection solutions ( http://en.wikipedia.org/wiki/Garbage_collection_%28SSD%29#Garbage_collection and http://en.wikipedia.org/wiki/Garbage_collection_%28computer_science%29 ) can lead to potential loss due to overwriting existing deleted data.

From an examiner's point of view, MFDE is most likely to have a huge impact on deleted data recovery (DDR) from flash chips. The methodology and science behind Chip Off and JTAG is currently used for recovery of deleted data from a  range of mobile devices. Overwriting 0101010101 (zeros and ones) or null values over particular areas or the entire area of the flash memory may make Chip Off and JTAG redundant in certain types of investigations and cases in the future.

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