TrueCrypt User Guide.pdf
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TRUE
CRYPT
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 7.1a
Released by TrueCrypt Foundation on February 7, 2012
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License.txt
INCLUDED IN TRUECRYPT BINARY AND SOURCE CODE DISTRIBUTION PACKAGES.
CONTENTS
INTRODUCTION.............................................................................................................................. 6
BEGINNER’S TUTORIAL .............................................................................................................. 7
How to Create and Use a TrueCrypt Container ....................................................................... 7
How to Create and Use a TrueCrypt-Encrypted Partition/Device ......................................... 25
TRUECRYPT VOLUME................................................................................................................ 26
C
REATING A
N
EW
T
RUE
C
RYPT
V
OLUME
........................................................................................ 26
Hash Algorithm...................................................................................................................... 26
Encryption Algorithm ............................................................................................................ 26
Quick Format ......................................................................................................................... 27
Dynamic................................................................................................................................. 27
Cluster Size ............................................................................................................................ 27
TrueCrypt Volumes on CDs and DVDs ................................................................................ 27
Hardware/Software RAID, Windows Dynamic Volumes ..................................................... 28
Additional Notes on Volume Creation .................................................................................. 28
F
AVORITE
V
OLUMES
....................................................................................................................... 29
S
YSTEM
F
AVORITE
V
OLUMES
......................................................................................................... 31
SYSTEM ENCRYPTION ............................................................................................................... 33
Hidden Operating System ...................................................................................................... 33
Operating Systems Supported for System Encryption........................................................... 34
TrueCrypt Rescue Disk .......................................................................................................... 34
PLAUSIBLE DENIABILITY ......................................................................................................... 37
H
IDDEN
V
OLUME
............................................................................................................................ 38
Protection of Hidden Volumes Against Damage ................................................................... 40
Security Requirements and Precautions Pertaining to Hidden Volumes ............................... 43
H
IDDEN
O
PERATING
S
YSTEM
.......................................................................................................... 47
Process of Creation of Hidden Operating System ................................................................. 49
Plausible Deniability and Data Leak Protection .................................................................... 50
Possible Explanations for Existence of Two TrueCrypt Partitions on Single Drive ............. 50
Safety/Security Precautions and Requirements Pertaining to Hidden Operating Systems ... 52
MAIN PROGRAM WINDOW ....................................................................................................... 54
Select File .............................................................................................................................. 54
Select Device ......................................................................................................................... 54
Mount..................................................................................................................................... 54
Auto-Mount Devices.............................................................................................................. 54
Dismount................................................................................................................................ 54
Dismount All.......................................................................................................................... 55
Wipe Cache............................................................................................................................ 55
Never Save History ................................................................................................................ 55
Exit......................................................................................................................................... 55
Volume Tools ........................................................................................................................ 56
2
P
ROGRAM
M
ENU
............................................................................................................................. 57
Volumes -> Auto-Mount All Device-Hosted Volumes ......................................................... 57
Volumes -> Dismount All Mounted Volumes....................................................................... 57
Volumes -> Change Volume Password ................................................................................. 57
Volumes -> Set Header Key Derivation Algorithm .............................................................. 57
Volumes -> Add/Remove Keyfiles to/from Volume............................................................. 58
Volumes -> Remove All Keyfiles from Volume ................................................................... 58
Favorites -> Add Mounted Volume to Favorites ................................................................... 58
Favorites -> Organize Favorite Volumes............................................................................... 58
Favorites -> Mount Favorites Volumes ................................................................................. 58
Favorites -> Add Mounted Volume to System Favorites ...................................................... 58
Favorites -> Organize System Favorite Volumes .................................................................. 58
System -> Change Password.................................................................................................. 58
System -> Mount Without Pre-Boot Authentication ............................................................. 58
Tools -> Clear Volume History ............................................................................................. 59
Tools -> Traveler Disk Setup................................................................................................. 59
Tools -> Keyfile Generator .................................................................................................... 59
Tools -> Backup Volume Header .......................................................................................... 59
Tools -> Restore Volume Header .......................................................................................... 59
Settings -> Preferences .......................................................................................................... 60
M
OUNTING
T
RUE
C
RYPT
V
OLUMES
................................................................................................. 62
Cache Password in Driver Memory ....................................................................................... 62
Mount Options ....................................................................................................................... 62
PARALLELIZATION .................................................................................................................... 63
PIPELINING.................................................................................................................................... 63
HARDWARE ACCELERATION.................................................................................................. 64
HOT KEYS....................................................................................................................................... 65
KEYFILES ....................................................................................................................................... 66
Keyfiles Dialog Window ....................................................................................................... 66
Security Tokens and Smart Cards.......................................................................................... 67
Keyfile Search Path................................................................................................................ 68
Empty Password & Keyfile.................................................................................................... 68
Quick Selection ...................................................................................................................... 68
Volumes -> Add/Remove Keyfiles to/from Volume............................................................. 69
Volumes -> Remove All Keyfiles from Volume ................................................................... 69
Tools -> Keyfile Generator .................................................................................................... 69
Settings -> Default Keyfiles................................................................................................... 69
SECURITY TOKENS & SMART CARDS................................................................................... 71
PORTABLE MODE ........................................................................................................................ 72
Tools -> Traveler Disk Setup................................................................................................. 72
LANGUAGE PACKS ...................................................................................................................... 74
Installation ............................................................................................................................. 74
ENCRYPTION ALGORITHMS.................................................................................................... 75
3
AES ........................................................................................................................................ 75
Serpent ................................................................................................................................... 76
Twofish .................................................................................................................................. 76
AES-Twofish ......................................................................................................................... 76
AES-Twofish-Serpent............................................................................................................ 76
Serpent-AES .......................................................................................................................... 77
Serpent-Twofish-AES............................................................................................................ 77
Twofish-Serpent..................................................................................................................... 77
HASH ALGORITHMS ................................................................................................................... 78
RIPEMD-160 ......................................................................................................................... 78
SHA-512 ................................................................................................................................ 78
Whirlpool ............................................................................................................................... 78
SUPPORTED OPERATING SYSTEMS....................................................................................... 79
COMMAND LINE USAGE ............................................................................................................ 80
Syntax .................................................................................................................................... 82
Examples................................................................................................................................ 82
SECURITY MODEL....................................................................................................................... 83
SECURITY REQUIREMENTS AND PRECAUTIONS ............................................................. 86
Data Leaks.............................................................................................................................. 86
Paging File ............................................................................................................................. 87
Memory Dump Files .............................................................................................................. 87
Hibernation File ..................................................................................................................... 88
Unencrypted Data in RAM .................................................................................................... 89
Physical Security.................................................................................................................... 89
Malware ................................................................................................................................. 90
Multi-User Environment ........................................................................................................ 90
Authenticity and Integrity ...................................................................................................... 91
Choosing Passwords and Keyfiles ......................................................................................... 91
Changing Passwords and Keyfiles......................................................................................... 92
Trim Operation....................................................................................................................... 92
Wear-Leveling ....................................................................................................................... 93
Reallocated Sectors ................................................................................................................ 93
Defragmenting ....................................................................................................................... 94
Journaling File Systems ......................................................................................................... 94
Volume Clones....................................................................................................................... 95
Additional Security Requirements and Precautions............................................................... 95
HOW TO BACK UP SECURELY ................................................................................................. 96
Non-System Volumes ............................................................................................................ 96
System Partitions ................................................................................................................... 96
General Notes......................................................................................................................... 98
MISCELLANEOUS......................................................................................................................... 99
Using TrueCrypt Without Administrator Privileges .............................................................. 99
Sharing over Network .......................................................................................................... 100
TrueCrypt Background Task................................................................................................ 101
4
Volume Mounted as Removable Medium ........................................................................... 102
TrueCrypt System Files & Application Data....................................................................... 103
How to Remove Encryption................................................................................................. 105
Uninstalling TrueCrypt ........................................................................................................ 106
Digital Signatures................................................................................................................. 107
TROUBLESHOOTING ................................................................................................................ 109
INCOMPATIBILITIES ................................................................................................................ 118
KNOWN ISSUES & LIMITATIONS .......................................................................................... 119
Known Issues ....................................................................................................................... 119
Limitations ........................................................................................................................... 119
FREQUENTLY ASKED QUESTIONS....................................................................................... 122
TECHNICAL DETAILS............................................................................................................... 134
N
OTATION
..................................................................................................................................... 134
E
NCRYPTION
S
CHEME
................................................................................................................... 135
M
ODES OF
O
PERATION
.................................................................................................................. 137
H
EADER
K
EY
D
ERIVATION
,
S
ALT
,
AND
I
TERATION
C
OUNT
.......................................................... 138
R
ANDOM
N
UMBER
G
ENERATOR
................................................................................................... 139
K
EYFILES
...................................................................................................................................... 141
T
RUE
C
RYPT
V
OLUME
F
ORMAT
S
PECIFICATION
............................................................................ 143
C
OMPLIANCE WITH
S
TANDARDS AND
S
PECIFICATIONS
................................................................. 145
S
OURCE
C
ODE
............................................................................................................................... 145
FUTURE DEVELOPMENT......................................................................................................... 146
CONTACT...................................................................................................................................... 146
LEGAL INFORMATION............................................................................................................. 146
VERSION HISTORY .................................................................................................................... 147
ACKNOWLEDGEMENTS........................................................................................................... 148
REFERENCES............................................................................................................................... 149
5
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