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

guarantee

information

wiping.

The detailed theory of guaranteed information wiping is described in an
article of Peter Gutmann, please see:

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

A.2

Algorithms Used by Acronis PrivacyExpert

The table below briefly describes information wiping algorithms used by
Acronis PrivacyExpert. Each description features the number of hard disk
sector passes along with number(s) written to each sector byte.

The description of built-in information wiping algorithms

Algorithm

(writing

method)

Passes Record

American: DoD
5220.22-M

4 1

pass – randomly selected symbols

to each byte of each sector, 2 –
complementary to written during the
1

pass; 3 – random symbols again;

4 – writing verification.

American:
NAVSO P-5239-
26 (RLL)

4 1

pass – 0x01 to all sectors, 2 -

0x27FFFFFF, 3 – random symbol
sequences, 4 – verification.

American:
NAVSO P-5239-
26 (MFM)

4 1

pass – 0x01 to all sectors, 2 -

0x7FFFFFFF, 3 – random symbol
sequences, 4 – verification.

German: VSITR 7

– 6

– alternate sequences of:

0x00 and 0xFF; 7

- 0xAA; i.e. 0x00,

0xFF, 0x00, 0xFF, 0x00, 0xFF, 0xAA.

Russian: GOST
P50739-95

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.

Appendix A : Hard Disk Wiping algorithms

Содержание PRIVACYEXPERT 2003

Страница 1: ...User s Guide PrivacyExpert 2003 Compute with confidence www acronis com...

Страница 2: ...it permission of the copyright holder Distribution of the work or derivative work in any standard paper book form for commercial purposes is prohibited unless prior permission is obtained from the cop...

Страница 3: ...RITHMS 22 CHAPTER 2 COMPLEX PC CLEAN UP 23 2 1 ENTIRE PC CLEAN UP 23 2 2 SYSTEM CLEAN UP 24 2 3 INTERNET CLEAN UP 24 CHAPTER 3 SEPARATE PC COMPONENTS CLEAN UP 25 3 1 INTERNET COMPONENTS 25 3 1 1 INTER...

Страница 4: ...files can be easily recovered under the Windows operating system to gain access to information a user would like to conceal 2 Windows and the most widespread browsers Internet Explorer and Netscape Na...

Страница 5: ...f very private personal data might fall into hands of malicious persons to suit such ends as blackmail intimidation extortion and orout rightfraud Your work colleagues might potentially gain access to...

Страница 6: ...cronis PrivacyExpert user s interface setting and executing different PC clean up variants Chapter 2 Complex PC Clean up If you need to perform a complex clean up of PC sections read section 2 1 Entir...

Страница 7: ...s that have legally purchased and registered their copy of Acronis PrivacyExpert receive free technical support from Acronis If you have problems installing or using the system that you cannot be reso...

Страница 8: ...rt the Acronis PrivacyExpert installation CD ROM into the CD ROM drive and run the program Please carefully follow all instructions shown in the installation wizard Having answered all the questions i...

Страница 9: ...ce features a standard Windows XP icon graphical user interface GUI elements We will not describe details here but instead pay general attention to setting and executing clean up variants 1 6 1 The Ac...

Страница 10: ...f three predefined complex PC clean up Ifyouneedtoperform 1 entire PC clean up including Windows system areas and sections related to working on the Internet execute EntirePCClean up 2 clean up of sec...

Страница 11: ...as well as separate components clean up are executed manually or by schedule and are set universally see 1 6 3 Executing PC Clean up Manually 1 6 6 Executing Scheduled PC Clean up 1 6 4 Clean up diff...

Страница 12: ...the context menu of a clean up variant by selecting Properties SettingPCcomponentclean upwiththeeditor Below you can see the opened settings editor featuring two groups of components to clean that be...

Страница 13: ...m file type Internet browser etc Files setting 3 to save your settings click Apply To discard changes click Cancel IfyouneedtorestoreAcronisPrivacyExpertdefaultclean upsettings 1 select the component...

Страница 14: ...d Address settings are common for components related to working on the Internet InternetBrowsers setting Acronis PrivacyExpert automatically finds all supported browsers installed on your PC and by de...

Страница 15: ...ial Internet addresses is almost infinite You can enter any number of addresses like worldsoccer com or formula1 com separated by semicolon Ifyouneedto 1 clean up Internet cache last visited pages lis...

Страница 16: ...ms and Appendix A Hard Disk Wiping algorithms The most secure algorithms are always very slow and vice versa the quickest algorithms provide less reliability and security Having mouse clicked a settin...

Страница 17: ...mma and symbols and can have values similar to the following to delete all files from the Recycle Bin with any file names and extensions doc to delete files with specific extension a Microsoft documen...

Страница 18: ...sult in removal of read txt readme txt read1 txt etc files while read doc readme doc etc will remain 3 delete only specific length filenames from the Recycle Bin system or user folder enter filename a...

Страница 19: ...ng according to Windows rules see Files setting If you simply need to delete all local network computer search strings suitable in most cases 1 select FindComputerList 2 check the EnabletheFindCompute...

Страница 20: ...reliably removed each day Acronis PrivacyExpert features a built in scheduler Invokingthescheduler Having mouse clicked a clean up variant in the right part of the Acronis PrivacyExpert main window an...

Страница 21: ...n all of the above click Next and set additional execution settings on the 2nd scheduler page IfyouneedautomaticPCclean up 1 at PC startup set the switch on the 1st scheduler page to When my computers...

Страница 22: ...that meet these national standards Acronis PrivacyExpert provides two far more powerful pre defined algorithms offered by top information security specialists 6 Peter Gutmann s algorithm 7 Bruce Schne...

Страница 23: ...user activity evidence 2 delete temporaryfiles from standard Windows folders 3 delete any file types from user folders on any disks connected to the PC 4 clean Windows RecycleBin 5 clean Windows swap...

Страница 24: ...be executed by mouse clicking the clean up variant in the right part of the main window for other execution methods see sections 1 6 3 1 6 6 For detailed descriptions of what Acronis PrivacyExpert pe...

Страница 25: ...s PrivacyExpert can perform in specific cases Various execution and set up capabilities of PC and separate components clean up variants of Acronis PrivacyExpert are described in detail above see 1 6 3...

Страница 26: ...on Each cached file has the Internet address property to track its origin It is therefore better to set the Address setting instead of Files when erasing Internet cache This enables you to delete file...

Страница 27: ...tent Acronis PrivacyExpert enables you to delete unnecessary cookies You can keep the cookies you need as Acronis PrivacyExpert can choose what cookies to delete and what to leave safe What cookies ar...

Страница 28: ...on a PC without the user s knowledge as various sites are visited ActiveX elements enable dynamic content on the web pages instead of just static viewing ActiveX elements can provide Internet access...

Страница 29: ...is nearly impossible to fully control all ActiveX elements Ifyouwishtocontrolinstalleddownloadedcomponents 1 select DownloadedComponentsclean up in the settings editor 2 select Protected Components a...

Страница 30: ...s lists differently depending on the page visiting method whether a user typed the address in the Address field or mouse clicked a link on the already opened page In some cases last visited pages are...

Страница 31: ...ll visited Internet address lists whether they were manually typed or clicked Note that site address can be typed into the Open field of the Run window invoked from the Start menu Clicking OK in this...

Страница 32: ...the windows and thus stored the contents of previous window in the swap file If the user closed the browser his her personal information has been very possibly stored in the swap file After swap file...

Страница 33: ...described further deleting all temporary files from folders on any connected disks according to the provided Files value Setting the temporary files clean up you can provide Files value to destroy all...

Страница 34: ...rely and unrecoverably destroys user files from specified folders using special algorithms see Data destruction algorithm and 1 7 Data Clean up Algorithms To delete user files Acronis PrivacyExpert en...

Страница 35: ...lists etc are stored not only in the registry but also in its back up copy If you clean up the user data stored in the registry with Acronis PrivacyExpert and re boot the PC Windows will automaticall...

Страница 36: ...er name including its domain name but can also be a partialcomputername Find computer strings stored in the registry Windows Explorer performs various file system navigation functions It also supports...

Страница 37: ...etes the list that indicates your file search activity on computer disks from the Windows registry A file string may contain a full filename including its path or just a partial name Find files string...

Страница 38: ...Selecting Documents from the Start menu you will find that Windows shows recently executed or opened files These can be images viewed Excel tables MP3 or WAV sound files etc To protect your privacy yo...

Страница 39: ...The Open list lets you type in a name of a file folder network folder or Internet address Clicking OK you run the program application open file or connect to the selected site Windows keeps a history...

Страница 40: ...el etc and folders are stored as links in the D Documents and Settings user name Recent folder Even if a file was deleted it is referenced from the Recent folder The link contains the file and folder...

Страница 41: ...y requires specialized software and inexpensive hardware to read data deleted this way by analyzing magnetization of hard disk sectors residual magnetization of track sides and or by using current mag...

Страница 42: ...Algorithm writing method Passes Record 1 American DoD 5220 22 M 4 1st pass randomly selected symbols to each byte of each sector 2 complementary to written during the 1st pass 3 random symbols again...

Страница 43: ...iping see http www cs auckland ac nz pgut001 pubs secure_del html 7 B Schneier s algorithm 7 Bruce Schneier offers seven pass overwriting algorithm in his Applied Cryptography book 1st pass 0xFF 2st p...

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