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Some questions about Truecrypt.

Hello everyone,

Recently was looking at some softwares that encrypts drives, and looks like Truecrypt is a good solution for me. I do plan to make a hidden partition as well. But I am just worried that, for example, I have the entire 1TB external HDD encrypted as outer layer, then I set 200GB for the hidden partition. If someone was forcing me to tell them the password, and I tell them the password that access the outer layer, will the external HDD will appear as 1TB, or 800GB (without counting the hidden partition)?
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  1. It will appear as a 1TB. But they will see a 200GB discrepancy, and beat that password out of you.

    Is there a particular reason for this 3 layer tinfoil hat question?
  2. Best answer
    ipwn3r456 said:
    Hello everyone,

    Recently was looking at some softwares that encrypts drives, and looks like Truecrypt is a good solution for me. I do plan to make a hidden partition as well. But I am just worried that, for example, I have the entire 1TB external HDD encrypted as outer layer, then I set 200GB for the hidden partition. If someone was forcing me to tell them the password, and I tell them the password that access the outer layer, will the external HDD will appear as 1TB, or 800GB (without counting the hidden partition)?


    The encapsulating volume will appear as 1TB, and the encapsulated volume will appear as 200GB. You have to be very, very careful with this though. The encapsulated volume is created within the uncommitted space of the encapsulating volume. This means that to the file system on the encapsulating volume it will appear as free space that simply contains random data. Contrary to what USAFRet said above, it is not possible to determine if an encrypted volume is hidden within that random data. Thus, any write to the encapsulating filesystem will eat into this space and destroy the encapsulated volume and neither Truecrypt nor the file system will stop you from doing this. Thus, you must first populate the encapsulating volume, and then create the encapsulated volume. After this is done, you must not write to the encapsulating volume under any circumstances.
  3. USAFRet said:
    It will appear as a 1TB. But they will see a 200GB discrepancy, and beat that password out of you.

    Is there a particular reason for this 3 layer tinfoil hat question?


    Well, just want to learn more about the hidden volume feature on Truecrypt.

    Pinhedd said:
    ipwn3r456 said:
    Hello everyone,

    Recently was looking at some softwares that encrypts drives, and looks like Truecrypt is a good solution for me. I do plan to make a hidden partition as well. But I am just worried that, for example, I have the entire 1TB external HDD encrypted as outer layer, then I set 200GB for the hidden partition. If someone was forcing me to tell them the password, and I tell them the password that access the outer layer, will the external HDD will appear as 1TB, or 800GB (without counting the hidden partition)?


    The encapsulating volume will appear as 1TB, and the encapsulated volume will appear as 200GB. You have to be very, very careful with this though. The encapsulated volume is created within the uncommitted space of the encapsulating volume. This means that to the file system on the encapsulating volume it will appear as free space that simply contains random data. Contrary to what USAFRet said above, it is not possible to determine if an encrypted volume is hidden within that random data. Thus, any write to the encapsulating filesystem will eat into this space and destroy the encapsulated volume and neither Truecrypt nor the file system will stop you from doing this. Thus, you must first populate the encapsulating volume, and then create the encapsulated volume. After this is done, you must not write to the encapsulating volume under any circumstances.


    So it will appear as a 1TB volume, and I should not store any size more than 800GB on the outer layer volume, as it will destroy the data in the 200GB hidden volume? Am I correct?
  4. ipwn3r456 said:
    USAFRet said:
    It will appear as a 1TB. But they will see a 200GB discrepancy, and beat that password out of you.

    Is there a particular reason for this 3 layer tinfoil hat question?


    Well, just want to learn more about the hidden volume feature on Truecrypt.

    Pinhedd said:
    ipwn3r456 said:
    Hello everyone,

    Recently was looking at some softwares that encrypts drives, and looks like Truecrypt is a good solution for me. I do plan to make a hidden partition as well. But I am just worried that, for example, I have the entire 1TB external HDD encrypted as outer layer, then I set 200GB for the hidden partition. If someone was forcing me to tell them the password, and I tell them the password that access the outer layer, will the external HDD will appear as 1TB, or 800GB (without counting the hidden partition)?


    The encapsulating volume will appear as 1TB, and the encapsulated volume will appear as 200GB. You have to be very, very careful with this though. The encapsulated volume is created within the uncommitted space of the encapsulating volume. This means that to the file system on the encapsulating volume it will appear as free space that simply contains random data. Contrary to what USAFRet said above, it is not possible to determine if an encrypted volume is hidden within that random data. Thus, any write to the encapsulating filesystem will eat into this space and destroy the encapsulated volume and neither Truecrypt nor the file system will stop you from doing this. Thus, you must first populate the encapsulating volume, and then create the encapsulated volume. After this is done, you must not write to the encapsulating volume under any circumstances.


    So it will appear as a 1TB volume, and I should not store any size more than 800GB on the outer layer volume, as it will destroy the data in the 200GB hidden volume? Am I correct?


    You should not store anything at all in the outer volume once it has been created
  5. Pinhedd said:
    ipwn3r456 said:
    USAFRet said:
    It will appear as a 1TB. But they will see a 200GB discrepancy, and beat that password out of you.

    Is there a particular reason for this 3 layer tinfoil hat question?


    Well, just want to learn more about the hidden volume feature on Truecrypt.

    Pinhedd said:
    ipwn3r456 said:
    Hello everyone,

    Recently was looking at some softwares that encrypts drives, and looks like Truecrypt is a good solution for me. I do plan to make a hidden partition as well. But I am just worried that, for example, I have the entire 1TB external HDD encrypted as outer layer, then I set 200GB for the hidden partition. If someone was forcing me to tell them the password, and I tell them the password that access the outer layer, will the external HDD will appear as 1TB, or 800GB (without counting the hidden partition)?


    The encapsulating volume will appear as 1TB, and the encapsulated volume will appear as 200GB. You have to be very, very careful with this though. The encapsulated volume is created within the uncommitted space of the encapsulating volume. This means that to the file system on the encapsulating volume it will appear as free space that simply contains random data. Contrary to what USAFRet said above, it is not possible to determine if an encrypted volume is hidden within that random data. Thus, any write to the encapsulating filesystem will eat into this space and destroy the encapsulated volume and neither Truecrypt nor the file system will stop you from doing this. Thus, you must first populate the encapsulating volume, and then create the encapsulated volume. After this is done, you must not write to the encapsulating volume under any circumstances.


    So it will appear as a 1TB volume, and I should not store any size more than 800GB on the outer layer volume, as it will destroy the data in the 200GB hidden volume? Am I correct?


    You should not store anything at all in the outer volume once it has been created


    After looking at the FAQ on Truecrypt's website, I understand what you are saying now. Thanks for the precaution. Now I need to think twice before I actually create a hidden partition on my external HDD's/USB flashdrives.
  6. ipwn3r456 said:
    Pinhedd said:
    ipwn3r456 said:
    USAFRet said:
    It will appear as a 1TB. But they will see a 200GB discrepancy, and beat that password out of you.

    Is there a particular reason for this 3 layer tinfoil hat question?


    Well, just want to learn more about the hidden volume feature on Truecrypt.

    Pinhedd said:
    ipwn3r456 said:
    Hello everyone,

    Recently was looking at some softwares that encrypts drives, and looks like Truecrypt is a good solution for me. I do plan to make a hidden partition as well. But I am just worried that, for example, I have the entire 1TB external HDD encrypted as outer layer, then I set 200GB for the hidden partition. If someone was forcing me to tell them the password, and I tell them the password that access the outer layer, will the external HDD will appear as 1TB, or 800GB (without counting the hidden partition)?


    The encapsulating volume will appear as 1TB, and the encapsulated volume will appear as 200GB. You have to be very, very careful with this though. The encapsulated volume is created within the uncommitted space of the encapsulating volume. This means that to the file system on the encapsulating volume it will appear as free space that simply contains random data. Contrary to what USAFRet said above, it is not possible to determine if an encrypted volume is hidden within that random data. Thus, any write to the encapsulating filesystem will eat into this space and destroy the encapsulated volume and neither Truecrypt nor the file system will stop you from doing this. Thus, you must first populate the encapsulating volume, and then create the encapsulated volume. After this is done, you must not write to the encapsulating volume under any circumstances.


    So it will appear as a 1TB volume, and I should not store any size more than 800GB on the outer layer volume, as it will destroy the data in the 200GB hidden volume? Am I correct?


    You should not store anything at all in the outer volume once it has been created


    After looking at the FAQ on Truecrypt's website, I understand what you are saying now. Thanks for the precaution. Now I need to think twice before I actually create a hidden partition on my external HDD's/USB flashdrives.


    you're most welcome
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