ACRONIS True Image Home 2010 Guía de usuario descargar pdf (Pagina 190)

24.3.2 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 –

0xFF, 2

pass – 0x00, and then five times with a

cryptographically secure pseudo-random sequence.

8. Fast 1 Logical zeros (0x00 numbers) to all sectors to wipe.

1 2 ... 185 186 187 188 189 190 191 192 193 194 195 196 197

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