Bedienungsanleitung Acronis True Image Home 2012 (Seite 210 von 229) (Englisch)

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8.7.4.1 Functioning principles of Information wiping methods

Physically, the complete wiping of information from a hard disk involves the switching of every

elementary magnetic area of the recording material as many times as possible by writing specially

selected sequences of logical 1's and 0's (also known as samples).

Using logical data encoding methods in current hard disks, you can select samples of symbol (or

elementary data bit) sequences to be written to sectors in order to repeatedly and effectively wipe

confidential information.

Methods offered by national standards provide (single or triple) recording of random symbols to disk

sectors that are straightforward and arbitrary decisions, in general, but still acceptable in simple

situations. The most effective information-wiping method is based on deep analysis of subtle

features of recording data to all types of hard disks. This knowledge speaks of the necessity of

complex multipass methods to guarantee information wiping.

The detailed theory of guaranteed information wiping is described in an article by Peter Gutmann.

Please see:

Secure Deletion of Data from Magnetic and Solid-State Memory at

http://www.cs.auckland.ac.nz/~pgut001/pubs/secure_del.html.

8.7.4.2 Information wiping methods used by Acronis

The table below briefly describes information wiping methods used by Acronis. Each description

features the number of hard disk sector passes along with the number(s) written to each sector byte.

The description of built-in information wiping methods

No. Algorithm (writing method) Passes Record

1. United States Department of

Defense 5220.22-M

pass – randomly selected symbols to each byte of

each sector, 2 – complementary to written during the

pass; 3 – random symbols again; 4 – writing

verification.

2. United States: NAVSO P-5239-

26 (RLL)

pass – 0x01 to all sectors, 2 – 0x27FFFFFF, 3 –

random symbol sequences, 4 – verification.

3. United States: NAVSO P-5239-

26 (MFM)

pass – 0x01 to all sectors, 2 – 0x7FFFFFFF, 3 –

random symbol sequences, 4 – verification.

4. German: VSITR 7

– 6

– alternate sequences of: 0x00 and 0xFF; 7

– 0xAA; i.e. 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0xAA.

5. Russian: GOST P50739-95 1 Logical zeros (0x00 numbers) to each byte of each

sector for 6

to 4

security level systems.

Randomly selected symbols (numbers) to each byte

of each sector for 3

to 1

security level systems.

6. Peter Gutmann's method 35 Peter Gutmann's method is very sophisticated. It's

based on his theory of hard disk information wiping

(see Secure Deletion of Data from Magnetic and

Solid-State Memory).

7. Bruce Schneier's method 7 Bruce Schneier offers a seven-pass overwriting

method in his Applied Cryptography book. 1

pass –

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