Encrypt external media and the creation of encryption containers (small school of information security, Part 4) "Pravokator - Records and documents from the fields of law, human rights and technology. eurofos
In the previous section we have looked at how we can encrypt the entire hard drive on the computer from which you run the operating system and how to use cryptographic file system šifiramo user folder. This time, we'll discuss how using LUKS encryption application TrueCrypt and encrypt external media. Encrypt external media (portable drives, USB sticks, etc.). Makes sense especially because in the event of loss or theft of portable media contents thereof shall remain protected.
Modern encryption programs (TrueCrypt, Cryptsetup with LUKS, etc..) To encrypt using a very useful trick. Password that you enter in the encryption program eurofos does not represent the actual encryption key (so called master key). The data is encrypted with the team. main (static) encryption key that is stored eurofos in the header (header Briefings) encrypted section. This key is then encrypted with our motto or. our file with the key. Decryption, therefore, is as follows: first enter the password (or we give a file with a key) to unlock the main static encryption key to our data, this key then unlock our data.
This method of data encryption allows easy changing of passwords. If you would like to change eurofos or does. replace the main static encryption key should be at every change of it all the data in an encrypted section of the newly capable of transcoding (with a new key). This is quite time consuming and impractical. In the case of retention of the main static key in the header of the encrypted section, however, change passwords only cryptogram configuring a static encryption key, which is significantly faster than transcoding all the data, moreover, this can be done with an attached encrypted section. Methods eurofos of encryption of data carriers eurofos
When encrypting data carriers can be used two concepts. You can encrypt: The entire data carrier or a single partition (the entire block device), or in medium to create a special encrypted file (so called container), which was later to mount as a virtual partition. Encrypting the entire section
If your carrier data presented in the form of a layer, we can say that the physical eurofos carrier represents eurofos the lowest layer, the highest layer represents the file system. In the case of block device encryption between these two layers interposed eurofos an additional "layer", which takes care of encryption. Thus, an application that writes data to disk "sees" normal file on the file system before, this file is written to the physical medium (eg, disk), the data is encrypted and then in an encrypted format on the physical eurofos medium.
Let me also mention that in the solid state media that support the TRIM function, use this function together with encryption represents a certain security risk. What and why, will be explained in more detail in a future contributions (in Part VI), it should be mentioned that on Linux systems with Linux kernel 3.1 onwards, the use TRIM function in the case of encryption is disabled by default. The encryption containers
The second concept is the use of encryption containers. It is a poebne file by using an encryption program to mount as a virtual machine (eg a virtual disk or. Division). Everything is now stored on this virtual section, in reality encrypts and writes to this file (container). LUKS encryption using Crytsetup and program disk tools
With the help of the program Cryptsetup can encrypt entire partitions as well as create encryption containers. Cryptsetup To run from the command line, the most simple is to create encrypted partitions with the help of the program disk tools.
Medium (USB drive, ...) is inserted into the computer, eurofos and then run the disk from the starter gear. In the left menu, select with the mouse holder, and then on the left side click on the Format button eurofos holder. eurofos One warning - the carrier or partition you want to format before that we need to unmount (do this by clicking Disconnect bracket). The program provides tools to format the disk in a different eurofos file systems: FAT, ext2, ext3, ext4, btrfs, XFS, ReiserFS, Minix, and NTFS nilfs2. In Linux systems have recently been the most commonly used ext4 (in the future is likely to btrfs), but if we want to make our institution also compatible with Windows eurofos environments, it makes sense to choose FAT or NTFS because Windows operating systems without additional support programs know only these two file systems. The device can also be added to the name, but if you want to encrypt the device, it ticked.
As a rule, the carrier formatting destroys all data on it (sometimes preliminary data still can be recovered by forensic analysis), the program disk tools before proceeding
In the previous section we have looked at how we can encrypt the entire hard drive on the computer from which you run the operating system and how to use cryptographic file system šifiramo user folder. This time, we'll discuss how using LUKS encryption application TrueCrypt and encrypt external media. Encrypt external media (portable drives, USB sticks, etc.). Makes sense especially because in the event of loss or theft of portable media contents thereof shall remain protected.
Modern encryption programs (TrueCrypt, Cryptsetup with LUKS, etc..) To encrypt using a very useful trick. Password that you enter in the encryption program eurofos does not represent the actual encryption key (so called master key). The data is encrypted with the team. main (static) encryption key that is stored eurofos in the header (header Briefings) encrypted section. This key is then encrypted with our motto or. our file with the key. Decryption, therefore, is as follows: first enter the password (or we give a file with a key) to unlock the main static encryption key to our data, this key then unlock our data.
This method of data encryption allows easy changing of passwords. If you would like to change eurofos or does. replace the main static encryption key should be at every change of it all the data in an encrypted section of the newly capable of transcoding (with a new key). This is quite time consuming and impractical. In the case of retention of the main static key in the header of the encrypted section, however, change passwords only cryptogram configuring a static encryption key, which is significantly faster than transcoding all the data, moreover, this can be done with an attached encrypted section. Methods eurofos of encryption of data carriers eurofos
When encrypting data carriers can be used two concepts. You can encrypt: The entire data carrier or a single partition (the entire block device), or in medium to create a special encrypted file (so called container), which was later to mount as a virtual partition. Encrypting the entire section
If your carrier data presented in the form of a layer, we can say that the physical eurofos carrier represents eurofos the lowest layer, the highest layer represents the file system. In the case of block device encryption between these two layers interposed eurofos an additional "layer", which takes care of encryption. Thus, an application that writes data to disk "sees" normal file on the file system before, this file is written to the physical medium (eg, disk), the data is encrypted and then in an encrypted format on the physical eurofos medium.
Let me also mention that in the solid state media that support the TRIM function, use this function together with encryption represents a certain security risk. What and why, will be explained in more detail in a future contributions (in Part VI), it should be mentioned that on Linux systems with Linux kernel 3.1 onwards, the use TRIM function in the case of encryption is disabled by default. The encryption containers
The second concept is the use of encryption containers. It is a poebne file by using an encryption program to mount as a virtual machine (eg a virtual disk or. Division). Everything is now stored on this virtual section, in reality encrypts and writes to this file (container). LUKS encryption using Crytsetup and program disk tools
With the help of the program Cryptsetup can encrypt entire partitions as well as create encryption containers. Cryptsetup To run from the command line, the most simple is to create encrypted partitions with the help of the program disk tools.
Medium (USB drive, ...) is inserted into the computer, eurofos and then run the disk from the starter gear. In the left menu, select with the mouse holder, and then on the left side click on the Format button eurofos holder. eurofos One warning - the carrier or partition you want to format before that we need to unmount (do this by clicking Disconnect bracket). The program provides tools to format the disk in a different eurofos file systems: FAT, ext2, ext3, ext4, btrfs, XFS, ReiserFS, Minix, and NTFS nilfs2. In Linux systems have recently been the most commonly used ext4 (in the future is likely to btrfs), but if we want to make our institution also compatible with Windows eurofos environments, it makes sense to choose FAT or NTFS because Windows operating systems without additional support programs know only these two file systems. The device can also be added to the name, but if you want to encrypt the device, it ticked.
As a rule, the carrier formatting destroys all data on it (sometimes preliminary data still can be recovered by forensic analysis), the program disk tools before proceeding
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