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TIHPB2ENS
Copyright © Acronis, Inc., 2000-2009
197
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.
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
Defense 5220.22-M
4
1
st
pass – randomly selected symbols to each byte of
each sector, 2 – complementary to written during
the 1
the 1
st
pass; 3 – random symbols again; 4 – writing
verification.
2.
United States: NAVSO P-
5239-26 (RLL)
5239-26 (RLL)
4
1
st
pass – 0x01 to all sectors, 2 – 0x27FFFFFF, 3 –
random symbol sequences, 4 – verification.
3.
United States: NAVSO P-
5239-26 (MFM)
5239-26 (MFM)
4
1
st
pass – 0x01 to all sectors, 2 – 0x7FFFFFFF, 3 –
random symbol sequences, 4 – verification.
4.
German: VSITR
7
1
st
– 6
th
– alternate sequences of: 0x00 and 0xFF; 7
th
– 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
sector for 6
th
to 4
th
security level systems.
Randomly selected symbols (numbers) to each byte
of each sector for 3
of each sector for 3
rd
to 1
st
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
based on his theory of hard disk information wiping
(see
7.
Bruce Schneier's method
7
Bruce Schneier offers a seven-pass overwriting
method in his Applied Cryptography book. 1
method in his Applied Cryptography book. 1
st
pass –
0xFF, 2
nd
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.