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How to unlock LUKS using Dropbear SSH keys remotely in Linux

On Linux, we encrypt our partitions and entire disk using Linux Unified Key Setup-on-disk-format (LUKS) for security and privacy reasons. We unlock LUKS protected disk by providing a passphrase at boot time. You need to be in front of your computer or use a remote console to open the encrypted disk under Linux at boot time. Let us see how to unlock LUKS using Dropbear SSH keys in Linux at boot time.