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TrueCrypt User Guide

Quick Selection 
Keyfiles and keyfile search paths can be quickly selected in the following ways:
• Right-click the Keyfiles button in the password entry dialog window and select one of the 
menu items. 
• Drag the corresponding file/folder icons to the keyfile dialog window or to the password 
entry dialog.
*
Found at the time when you are mounting the volume, changing its password, or performing any other operation that 
involves re-encryption of the volume header. 


69 
Volumes -> Add/Remove Keyfiles to/from Volume 
This function allows you to re-encrypt a volume header with a header encryption key derived from 
any number of keyfiles (with or without a password), or no keyfiles at all. Thus, a volume which is 
possible to mount using only a password can be converted to a volume that require keyfiles (in 
addition to the password) in order to be possible to mount. Note that the volume header contains 
the master encryption key with which the volume is encrypted. Therefore, the data stored on the 
volume will not be lost after you use this function. 
This function can also be used to change/set volume keyfiles (i.e., to remove some or all keyfiles
and to apply new ones). 
Remark: This function is internally equal to the Password Change function. 
When TrueCrypt re-encrypts a volume header, the original volume header is first overwritten 256 
times with random data to prevent adversaries from using techniques such as magnetic force 
microscopy or magnetic force scanning tunneling microscopy [17] to recover the overwritten 
header (however, see also the chapter Security Requirements and Precautions). 
Volumes -> Remove All Keyfiles from Volume 
This function allows you to re-encrypt a volume header with a header encryption key derived from 
a password and no keyfiles (so that it can be mounted using only a password, without any 
keyfiles). Note that the volume header contains the master encryption key with which the volume is 
encrypted. Therefore, the data stored on the volume will not be lost after you use this function. 
Remark: This function is internally equal to the Password Change function. 
When TrueCrypt re-encrypts a volume header, the original volume header is first overwritten 256 
times with random data to prevent adversaries from using techniques such as magnetic force 
microscopy or magnetic force scanning tunneling microscopy [17] to recover the overwritten 
header (however, see also the chapter Security Requirements and Precautions). 

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