Attacking TrueCrypt

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Step-by-step instructions to recover passwords to TrueCrypt disk drives. Here you will learn how to extract the data needed to find passwords for encrypted disks and learn how to save time when recovering TrueCrypt passwords. You have a disk encrypted with TrueCrypt. However, you have lost the password needed to decrypt the TrueCrypt disk. Differences in disk encryption options:. To validate the attempted passwords, we need bytes of data from the TrueCrypt disk. Depending on the type of encrypted disk, these values are stored with different offsets:. We will use a program to copy the disk byte-by-byte in order to extract a data dump. This is similar to the dd command on Unix systems — dd for Windows. Window will report that the disk is damaged, and it will offer to format it. Cancel the formatting request:. The system will display a new disk with an assigned letter. Here it is Disk G: The program is downloaded as a ZIP archive. Unpack it to a separate folder. Here it is the folder 'C: Open the Start menu, enter 'cmd' in the search box, right click on the found shortcut and select the option 'Run as administrator':. Enter the command dd --list , and you will see a list arranged by size of all the connected disks that the system can detect here the size of the physical disk is 40 GB:. Here we have already specified the system link to path linking the disk to the system. It is required in order to address the physical disk. It is not necessary to identify the system name of the logical disk. It can be addressed using its assigned disk letter. You will now see two files in the folder with the program 'dd for Windows': In order to make sure that we have extracted the required data from the physical disk , we open the resulting file here it is If everything was done correctly, we will see the 'TrueCrypt Boot Loader' token:. Once we obtain the data needed to attack the TrueCrypt password, we can proceed to the second stage. TrueCrypt uses strong encryption algorithms and tricks that slow down the password checking process. Thus, you will not achieve fast speeds when brute-forcing passwords using any software. These will significantly speed up the brute-forcing process. We use a program with flexible settings to check a range of values very quickly in order to recover TrueCrypt passwords. Here everything is as you would expect: Here it is 1. Insofar as the data dump does not contain a clear structure, Passcovery Suite will make the assumption that this is TrueCrypt data. Data in TrueCrypt are protected using algorithmic pair hashing and encryption. One of three hashing algorithms is set when creating the volume or disk:. Passcovery Suite supports all options, but it is impossible to know which pair is used for data protection, and it requires additional time to check each combination. If there is no reliable information about the hashing-encryption pair, then select all options. This requires spending additional time, but only a full check guarantees that we will not miss the right password due to an error in pair selection. Click here for more information about the capabilities of attacks. Video clips demonstrating these attacks can be found on our YouTube channel. When the settings are configured, we launch the search and wait for a result. When it is running, the Passcovery Suite saves the attack settings and status messages in a file with the extension. This means that we can always abort the attack and return to it later. When the password is discovered, the program displays it as a hyperlink. Click on it, copy it to the clipboard, and you will be able to open the encrypted TrueCrypt disk:. Recovering TrueCrypt passwords is a thorny path that is covered in bitter disappointments and requires enormous amounts of time for searching. If you do decide to attempt to recover a TrueCrypt password, then you will need to know something about the password structure. You will also need:. Was this article helpful? Recovering a password for a TrueCrypt disk Rating Votes: Statement of the Problem You have a disk encrypted with TrueCrypt. Differences in disk encryption options: It is connected to a production system via USB. We will consider both options. Extracting data to attack the TrueCrypt password To validate the attempted passwords, we need bytes of data from the TrueCrypt disk. Depending on the type of encrypted disk, these values are stored with different offsets: These data are stored in the zero sector of the logical disk offset 0x00 Encrypted physical disk. The TrueCrypt loader bootloader is located in the primary sectors. Connect the external disk that is encrypted with TrueCrypt. Cancel the formatting request: Download and unzip dd for Windows. Launch the command line interface and go to the folder containing the program 'dd for Windows'. Open the Start menu, enter 'cmd' in the search box, right click on the found shortcut and select the option 'Run as administrator': Enter the command dd --list , and you will see a list arranged by size of all the connected disks that the system can detect here the size of the physical disk is 40 GB: Extract data in order to recover the TrueCrypt password. We copy from the beginning of the logical drive G: We copy from the beginning of the disk with a particular system name to the file If everything was done correctly, we will see the 'TrueCrypt Boot Loader' token: If we see nothing when we view the logical disk, then we will see a chaotic set of data. This is Passcovery Suite , which is a program that provides: Launch Passcovery Suite and select the file with the data dump from the TrueCrypt disk Here everything is as you would expect: Confirm that you selected the file to recover the TrueCrypt password. Step 3 - Define the hash function and the encryption algorithm to verify the passwords Data in TrueCrypt are protected using algorithmic pair hashing and encryption. One of three hashing algorithms is set when creating the volume or disk: Settings for various types of encrypted disks: Any hashing-encryption functions are possible: This disk contains the TrueCrypt bootloader, which makes its own adjustments: You must specify the address offset 7C00 to access the last bytes of data, which are read at the first stage in the Step 4 - Choose the password attack and configure its options. Passcovery Suite will offer three types of attacks with a large set of options: An attack that attempts all possible options. You can specify a character set, password length and install a simple mask. The slowest option brute-force attack with mask positioning. An attack that is attempted using only options that match the mask rules. You can set values individually for each password position e. This is the best option when you know the password structure. An attack that attempts all words in the dictionary. You can combine words from different Unicode-dictionaries, change, delete, rearrange, and replace characters. This is a great option for passwords that are formed by attempting common words. Starting the TrueCrypt password recovery process. Click on it, copy it to the clipboard, and you will be able to open the encrypted TrueCrypt disk: Summary Recovering TrueCrypt passwords is a thorny path that is covered in bitter disappointments and requires enormous amounts of time for searching. You will also need:

Attacking TrueCrypt

Восстановление пароля к TrueCrypt диску

Recovering a password for a TrueCrypt disk