cryptsetup-convert - Linux

Overview

cryptsetup-convert is a Linux command used to convert an existing LUKS (Linux Unified Key Setup) encrypted partition or device to a different type of encryption. This allows users to upgrade or migrate their encrypted partitions to newer and more secure encryption algorithms.

Syntax

cryptsetup-convert [options] <device_or_partition>

Options/Flags

• -c Encrypt the whole partition (default)
• -c –cipher <cipher_name> Specify the encryption cipher to use
• -s Shrink the header if possible
• -k Add an encrypted header with passphrase
• -t Test mode (don’t perform any changes)
• –key-file Use a key file for passphrase
• –key-slot Use specified key slot

Examples

Convert a LUKS partition to a new encryption cipher (e.g., aes-xts-plain64):

cryptsetup-convert --cipher aes-xts-plain64 /dev/sdc1

Add an encrypted header with a passphrase:

cryptsetup-convert -k /dev/sdc1

Test the conversion without making any changes:

cryptsetup-convert -t /dev/sdc1

Common Issues

• Permission denied: Ensure you have sufficient permissions to modify the partition or device.
• Device not found: Verify that the specified device or partition exists.
• Invalid cipher: Check that the specified cipher is supported by your system.

Integration

cryptsetup-convert can be integrated with other tools like cryptsetup and dmsetup to manage and manipulate encrypted partitions and devices.

Related Commands

• cryptsetup
• dmsetup
• luksdump
• luks-header