LUKS
LUKS encryption
Getting Started
See Archwiki: dm-crypt/Device encryption.
Encrypting a device
- Setup encryption
cryptsetup -v --type luks --cipher aes-xts-plain64 --key-size 512 --hash sha512 \
--iter-time 3000 --use-urandom --verify-passphrase luksFormat <device>
- Open encrypted drive
cryptsetup open <device> <name>
- Create a partition
mkfs.fstype /dev/mapper/<name> # E.g. # mkfs.ext4 /dev/mapper/luksdrive1
- Securely wipe the unused portion of the drive
- Do this to prevent cryptographic attacks and to overwrite existing data on the drive
dd if=/dev/zero of=<file_somewhere> status=progress # Delete the file afterwards
- Notes
- You can see defaults using
cryptsetup --help. --type
defaults
defaults on Ubuntu 18.04
Default compiled-in device cipher parameters: loop-AES: aes, Key 256 bits plain: aes-cbc-essiv:sha256, Key: 256 bits, Password hashing: ripemd160 LUKS1: aes-xts-plain64, Key: 256 bits, LUKS header hashing: sha256, RNG: /dev/urandom
Mounting
# Open the encrypted drive cryptsetup open <device> <name> # Mount your partition mount -t <fstype> /dev/mapper/<name> <mountlocation>
Unmounting
# Unmount your partition umount <mountlocation> # Close the decrypted drive cryptsetup close <name>