Here is something i found:
Ensure LUKS Drive is ConfiguredIf the drive isn’t encrypted yet, you can encrypt it with LUKS:
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sudo cryptsetup luksFormat /dev/sdX
Replace /dev/sdX with the appropriate drive/partition. Be cautious—this step will erase all data on the drive.
Edit the /etc/crypttab file to configure the system to unlock the drive at boot.
Open the file:
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sudo nano /etc/crypttab
Add an entry for the encrypted drive:
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cryptname /dev/sdX none luks
cryptname: A name for the decrypted device (used later in /etc/fstab).
/dev/sdX: Path to the encrypted device.
none: Use none for a passphrase prompt at boot or specify a path to a key file.
luks: Indicates LUKS encryption.
Example:
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cryptdrive /dev/sdb1 none luks
3. Add the Decrypted Device to /etc/fstab
To automatically mount the decrypted drive after unlocking:
Edit /etc/fstab:
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sudo nano /etc/fstab
Add an entry for the decrypted drive:
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/dev/mapper/cryptname /mnt/mountpoint ext4 defaults 0 2
Replace:
/dev/mapper/cryptname with the mapped device from /etc/crypttab.
/mnt/mountpoint with your desired mount point.
ext4 with your file system type.
4. Generate an Initramfs
If the root file system or a critical drive is encrypted, you’ll need to update the initramfs to include decryption tools.
Update the initramfs:
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sudo update-initramfs -u
Verify that the cryptsetup package is installed in your initramfs configuration.
Reboot the system and observe the decryption process:
If you specified none in /etc/crypttab, you should be prompted for a passphrase at boot.
If a key file was used, the drive should decrypt automatically.
6. Using a Key File for Automatic Decryption
To avoid entering a passphrase at boot, use a key file:
Generate a key file:
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sudo dd if=/dev/urandom of=/root/luks-keyfile bs=4096 count=1
Set permissions:
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sudo chmod 600 /root/luks-keyfile
Add the key file to the LUKS header:
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sudo cryptsetup luksAddKey /dev/sdX /root/luks-keyfile
Update /etc/crypttab:
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cryptname /dev/sdX /root/luks-keyfile luks
Update the initramfs:
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sudo update-initramfs -u
Reboot to test automatic decryption.
Device not found during boot: Ensure the correct device path is used in /etc/crypttab.
Passphrase prompt not appearing: Verify cryptsetup is installed and included in initramfs.
Boot hangs or fails: Boot into a live session, comment out entries in /etc/fstab or /etc/crypttab, and investigate.