TrueCrypt User Guide.pdf

TRUECRYPT

F R E E O P E N - S O U R C E O N - T H E - F L Y E N C R Y P T I O N

USER’S GUIDE

www.truecrypt.org

Version Information

TrueCrypt User’s Guide, version 6.1a. Released December 1, 2008.

Licensing Information

By installing, running, using, copying, (re)distributing, and/or modifying TrueCrypt or a portion thereof you

accept all terms, responsibilities and obligations contained in the TrueCrypt License the full text of which is

contained in the file License.txt included in TrueCrypt binary and source code distribution packages.

This software as a whole:

Portions of this software:

For more information, please see the legal notices attached to parts of the source code.

Trademark Information

TrueCrypt and the TrueCrypt logos are trademarks of the TrueCrypt Foundation.

Note: The goal is not to monetize the name or the product, but to protect the reputation of TrueCrypt, and to

prevent support issues and other kinds of issues that might arise from the existence of similar products with

the same or similar name. Even though TrueCrypt is a trademark, TrueCrypt is and will remain open-source

and free software.

Any other trademarks are the sole property of their respective owners.

Limitations

The TrueCrypt Foundation does not warrant that the information contained in this document meets your

requirements or that it is free of errors.

CONTENTS

INTRODUCTION.............................................................................................................................. 6

BEGINNER’S TUTORIAL .............................................................................................................. 7

How to Create and Use a TrueCrypt Container ....................................................................... 7

How to Create and Use a TrueCrypt Partition/Device........................................................... 25

PLAUSIBLE DENIABILITY ......................................................................................................... 26

H IDDEN V OLUME ............................................................................................................................ 27

Protection of Hidden Volumes Against Damage ................................................................... 29

Security Precautions Pertaining to Hidden Volumes ............................................................. 32

H IDDEN O PERATING S YSTEM .......................................................................................................... 35

Process of Creation of Hidden Operating System ................................................................. 36

Plausible Deniability and Data Leak Protection .................................................................... 38

Possible Explanations for Existence of Two TrueCrypt Partitions on Single Drive ............. 38

Safety and Security Precautions Pertaining to Hidden Operating Systems........................... 40

SYSTEM ENCRYPTION ...............................................................................................................41

Operating Systems Supported for System Encryption........................................................... 41

TrueCrypt Rescue Disk.......................................................................................................... 42

Hidden Operating System ...................................................................................................... 43

TRUECRYPT VOLUME................................................................................................................44

C REATING A N EW T RUE C RYPT V OLUME ........................................................................................ 44

Hash Algorithm...................................................................................................................... 44

Encryption Algorithm ............................................................................................................44

Quick Format ......................................................................................................................... 45

Dynamic................................................................................................................................. 45

Cluster Size ............................................................................................................................ 45

TrueCrypt Volumes on CDs and DVDs ................................................................................ 45

Hardware/Software RAID, Windows Dynamic Volumes ..................................................... 46

Additional Notes on Volume Creation .................................................................................. 46

MAIN PROGRAM WINDOW ....................................................................................................... 47

Select File .............................................................................................................................. 47

Select Device ......................................................................................................................... 47

Mount..................................................................................................................................... 47

Auto-Mount Devices..............................................................................................................47

Dismount................................................................................................................................ 48

Dismount All.......................................................................................................................... 48

Wipe Cache............................................................................................................................ 48

Never Save History ................................................................................................................ 48

Exit......................................................................................................................................... 48

Volume Tools ........................................................................................................................ 49

P ROGRAM M ENU ............................................................................................................................. 50

Volumes -> Auto-Mount All Device-Hosted Volumes ......................................................... 50

Volumes -> Save Currently Mounted Volumes as Favorite .................................................. 50

Volumes -> Mount Favorite Volumes ................................................................................... 50

Volumes -> Set Header Key Derivation Algorithm .............................................................. 50

Volumes -> Change Volume Password ................................................................................. 51

System -> Change Password.................................................................................................. 51

System -> Mount Without Pre-Boot Authentication ............................................................. 51

Tools -> Clear Volume History ............................................................................................. 52

Tools -> Traveler Disk Setup................................................................................................. 52

Tools -> Keyfile Generator .................................................................................................... 52

Tools -> Backup Volume Header .......................................................................................... 52

Tools -> Restore Volume Header .......................................................................................... 52

Settings -> Preferences .......................................................................................................... 53

M OUNTING T RUE C RYPT V OLUMES ................................................................................................. 55

Cache Password in Driver Memory ....................................................................................... 55

Mount Options ....................................................................................................................... 55

HOT KEYS....................................................................................................................................... 56

KEYFILES ....................................................................................................................................... 56

Keyfiles Dialog Window ....................................................................................................... 57

Security Tokens and Smart Cards.......................................................................................... 57

Keyfile Search Path................................................................................................................ 58

Empty Password & Keyfile.................................................................................................... 58

Quick Selection ...................................................................................................................... 58

Keyfiles -> Add/Remove Keyfiles to/from Volume.............................................................. 59

Keyfiles -> Remove All Keyfiles from Volume.................................................................... 59

Keyfiles -> Generate Random Keyfile .................................................................................. 59

Keyfiles -> Set Default Keyfile/Paths.................................................................................... 59

SECURITY TOKENS & SMART CARDS................................................................................... 61

TRAVELER MODE ........................................................................................................................ 62

Tools -> Traveler Disk Setup................................................................................................. 62

USING TRUECRYPT WITHOUT ADMINISTRATOR PRIVILEGES .................................. 63

TRUECRYPT BACKGROUND TASK ........................................................................................ 63

LANGUAGE PACKS ...................................................................................................................... 64

Installation ............................................................................................................................. 64

ENCRYPTION ALGORITHMS.................................................................................................... 65

AES ........................................................................................................................................ 65

Serpent ................................................................................................................................... 66

Twofish .................................................................................................................................. 66

AES-Twofish ......................................................................................................................... 66

AES-Twofish-Serpent............................................................................................................ 67

Serpent-AES .......................................................................................................................... 67

Serpent-Twofish-AES............................................................................................................ 67

Twofish-Serpent..................................................................................................................... 67

HASH ALGORITHMS ................................................................................................................... 68

RIPEMD-160 ......................................................................................................................... 68

SHA-512 ................................................................................................................................ 68

Whirlpool ............................................................................................................................... 68

SUPPORTED OPERATING SYSTEMS....................................................................................... 69

COMMAND LINE USAGE............................................................................................................ 70

Syntax .................................................................................................................................... 72

Examples................................................................................................................................ 72

SHARING OVER NETWORK ...................................................................................................... 73

SECURITY PRECAUTIONS ......................................................................................................... 74

Paging File ............................................................................................................................. 74

Hibernation File ..................................................................................................................... 75

Memory Dump Files .............................................................................................................. 75

Multi-User Environment........................................................................................................ 76

Unencrypted Data in RAM .................................................................................................... 76

Changing Passwords and Keyfiles......................................................................................... 77

Data Leaks ............................................................................................................................. 77

Windows Registry.................................................................................................................. 78

Wear-Leveling ....................................................................................................................... 78

Reallocated Sectors................................................................................................................ 79

Defragmenting ....................................................................................................................... 79

Journaling File Systems .........................................................................................................79

HOW TO BACK UP SECURELY ................................................................................................. 80

Non-System Volumes ............................................................................................................ 80

System Partitions ................................................................................................................... 81

General Notes......................................................................................................................... 82

TROUBLESHOOTING .................................................................................................................. 83

INCOMPATIBILITIES .................................................................................................................. 86

KNOWN ISSUES & LIMITATIONS ............................................................................................ 87

Known Issues ......................................................................................................................... 87

Limitations ............................................................................................................................. 87

FREQUENTLY ASKED QUESTIONS......................................................................................... 89

HOW TO REMOVE ENCRYPTION.......................................................................................... 100

UNINSTALLING TRUECRYPT................................................................................................. 101

TRUECRYPT SYSTEM FILES & APPLICATION DATA ..................................................... 101

TECHNICAL DETAILS ............................................................................................................... 102

N OTATION ..................................................................................................................................... 102

E NCRYPTION S CHEME ................................................................................................................... 103

M ODES OF O PERATION .................................................................................................................. 105

H EADER K EY D ERIVATION , S ALT , AND I TERATION C OUNT .......................................................... 106

R ANDOM N UMBER G ENERATOR ................................................................................................... 107

K EYFILES ...................................................................................................................................... 109

T RUE C RYPT V OLUME F ORMAT S PECIFICATION ............................................................................ 111

C OMPLIANCE WITH S TANDARDS AND S PECIFICATIONS ................................................................. 113

S OURCE C ODE ............................................................................................................................... 113

FUTURE DEVELOPMENT......................................................................................................... 114

LICENSE ........................................................................................................................................ 114

CONTACT...................................................................................................................................... 114

VERSION HISTORY .................................................................................................................... 115

ACKNOWLEDGEMENTS........................................................................................................... 117

REFERENCES............................................................................................................................... 118

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