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Maousse |
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Guru 
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Niveau : 5 N° de Membre :
1121
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Inscription: 14 Apr 2002
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Ah oui, il ne faut pas abuser de ce type de sécurité... ça use les disques aussi!
Tiens, pour informations (en anglais) :
1. American: DoD 5220.22-M (4 passes)
1st pass – randomly selected symbols to each byte of each sector, 2 – complementary to written during the 1st pass; 3 – random symbols again; 4 – writing verification.
2. American NAVSO P-5239-26 (RLL) (4 passes)
1st pass – 0x01 to all sectors, 2 - 0x27FFFFFF, 3 – random symbol sequences, 4 – verification.
3. American NAVSO P-5239-26 (MFM) (4 passes)
1st pass – 0x01 to all sectors, 2 - 0x7FFFFFFF, 3 – random symbol sequences, 4 – verification.
4. German: VSITR (7 passes)
1st – 6th – alternate sequences of: 0x00 and 0xFF; 7th - 0xAA; i.e. 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0xAA.
5. Russian: GOST P50739-95 (1 pass)
Logical zeros (0x00 numbers) to each byte of each sector for 6th to 4th security level systems. Randomly selected symbols (numbers) to each byte of each sector for 3rd to 1st security level systems.
6. P. Gutmann’s algorithm (35 passes)
Peter Gutmann’s algorithm is very sophisticated. It’s based on his theory of hard disk information wiping (see http://www.cs.auckland.ac.nz/~pgut0...secure_del.html).
7. B. Schneier’s algorithm (7 passes)
Bruce Schneier offers seven pass overwriting algorithm in his Applied Cryptography book. 1st pass – 0xFF, 2st pass – 0x00, and then five times with a cryptographically secure pseudo-random sequence.
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