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How to use GostCrypt

Create a ciphered system or container

Once GostCrypt is correctly installed (if not, please go to the home page and click on your OS to get the installation procedure), you can launch it by double-clicking on the icon. The following window should open :

This is the main page of GostCrypt. From here, you can create a volume, mount it, unmount it, select a device etc. Let's begin with the creation. Click on Create Volume and this window should open :

This window lets you choose between the different options of creation. As you may know, on Windows, you can ciphered only an archive, a non-system partition (like a common data partition between two OSes) or the whole system drive (C: by default). We will show you how to do each one.

Create an archive

The first option allows you to create only an archive. This one will appear as a normally file, with the .gst extension. By clicking on it, you will open GostCrypt and will be able to mount it and to use it. But first, let see how to create this archive. There are two options : a standard volume and a hidden volume. The standard volume is defined as written just before but the hidden volume will create a volume in an other one. Those two volumes will have different passwords and you will be able to use one or the other, or both. You will choose the Standard GostCrypt Volume option to make it easy.

We will now choose where we will create the archive. It is only for the creation, you will be able to put it wherever you want once created. Click on next when it's okay.

This page is show you the encryption options. On this page, you can choose between the different algorithms. A short information is available for each one. If you don't know what to choose, take the default options.

Now, choose the size of the archive you are about to create. The minimum size of a FAT volume is 292 KB and is 3792KB for a NTFS volume. The maximum is only the size available on your hard drive.

This is one of the most important step. You will enter your password here. Be aware that the GOST standards are very strong against attacks, but a short password will be break by a bruteforce attack (test of all possible passwords). The longer your password, the stronger. The best passwords contain letters, figures and symbols.

Now, choose the file format for your archive. On Windows, the default format will be NTFS. But if you will use the archive on Linux too, you rather choose FAT. You can now click on format. This can take a lot of time if you want a big archive.

Create a non-system ciphered partition

Now we will see how to cipher a partition. This could be very useful if you have two OS on your machine and you share a partition between the two to store your data. To use this option, we will consider that you have already create the partition you want to cipher.

Choose here between a standard GostCrypt Volume and a hidden GostCrypt volume.

This window shows you the different partitions of your system. They are divided between each disk (Hard drive, removable drive…). Be careful when you choose your partition.

There are only two options. The first one will erase your partition and all its data to create a ciphered partition. The second one will cipher the data and create the archive without erasing your data. It will take much more time.

Choose the algorithms you want to use to cipher your partition.

This window will tell you the size of the partition you are about to cipher. You can't modify the size because it is dependent of the partition.

Obviously, you need to choose a password to encrypt your data. Please follow the instructions given in the software or in the first part of this document.

The creation wizard asks if you will store files larger than 4GB. This question will impact the choice of the filesystem. Some filesystems don't support files larger than 4GB (like fat32).

You can now choose your filesystem (according to your previous choice about the maximum size of the files you will store) and format your partition. This part could be long but it will only be done once.

Create a system ciphered partition

Before the beginning of this part, please do backups of your data.

As usual, you can choose between the two types of encryption (hidden and normal). For beginners, we suggest to use the normal mode. If you choose the hidden mode, the following window will be displayed :

It informs you how the hidden encryption works.

If you chose the normal mode, it will directly go to the following window. This window let you choose between a whole drive encryption, including the boot, and a whole partition encryption. This second option can be choose to encrypt a whole external hard drive for example or a partition of data on an internal one.

On a big of part of hard drive, there is a protected zone, that is accesssible by softwares or OSes. For beginners, click on “no”.

The creation wizard needs to know if you have multiple OSes on your computer. Indicate if so and click on next.

The following of the installation is the same as the creation of a container. You choose the algorithms you want, then your password and continue clicking on next until this window :

Here, you need to insert a CD or DVD in your computer to burn the ISO the software is about to create. This image contains some data in case you forgot your password and want to decrypt the whole disk. Follow the instructions provided by Windows.

After this steps, you will be back on GostCrypt and be able to continue the encryption procedure. The wipe mode allows you to choose a safer way to encrypt your data. Read the text and choose the option you prefer.

In the next window, simply launch the test. It will check some values to be sure the encryption won't fail.

When you will click on test, a message box will appear with all the solutions you could need if the encryption fails.

Windows will reboot to test the encryption. It will ask for your password and launch the tests.

Once Windows will be launch, GostCrypt will pop up and tell you that the pretest are done and that the encryption can be done. Click on next all the next windows and your hard drive will be encrypted.

Mount an archive

Back to the main page of GostCrypt. Now we have created our archive, you want to mount it and use it.

Click on “Select file” if you want to mount an archive. Select your archive where you created it and click on “Ok”. It will ask for your password to open the archive.

The archive will appear as any devices.

utilisation.txt · Last modified: 2016/01/20 18:01 (external edit)