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3
votes
1answer
42 views

Abysmal general dm-crypt (LUKS) write performance

I am investigating a problem where encrypting a block device imposes a huge performance penalty when writing to it. Hours of Internet reading and experiments did not provide me with a proper ...
0
votes
0answers
8 views

Optimizing initramfs : Enter dm-crypt password with targeted initramfs?

All my Linux partitions except /boot lie on an encrypted LVM volume, like a typical modern Debian installation. In theory, I could shrink my initrd file by replacing the line MODULES=most in ...
0
votes
0answers
23 views

crypttab and veracrypt

I dual boot Fedora and Windows Vista and want them to share a partition so that I can work on the same files in both Linux and Windows, and I need everything to be encrypted. I encrypted the shared ...
1
vote
1answer
93 views

cryptsetup luksFormat - cannot open device for read-only access

I created a new partition that I would like to encrypt with LUKS. The device is a 1GB partition with ID 83 (Linux). I've changed the owner to root, and chmod to 777. The command I'm using is : ...
2
votes
1answer
75 views

List open dm-crypt LUKS volumes

If I mount a simple loop device, losetup -a give me the devices opened. Is something similar possible with cryptsetup?
3
votes
2answers
163 views

Can a systemd dependency be applied only to a unit's “ExecStart” action?

I have a scenario where a number of storage volumes are encrypted using keys contained on a removable encrypted USB "keyring" flash drive. I am running Arch Linux and this question is about systemd ...
4
votes
2answers
138 views

error mounting truecrypt disk with cryptsetup

Trying to use cryptsetup to mount a drive encrypted with truecrypt. Doing this: sudo cryptsetup open --type tcrypt --readonly /dev/sdc1 encrypted_drive and then typing the passphrase gives me: ...
1
vote
1answer
171 views

Arch mkinitcpio grub boot fails on edit

I'm experiencing this strange behavior. I am using ArchLinux, generated boot things with mkinitcpio, and using Grub2 (not legacy). When booting, and pressing "e" to edit the entry (to see boot ...
3
votes
1answer
228 views

losetup /dev/loop0 disappears after some time

at the moment I do some tests with loop devices on Linux/Ubuntu. In a small test script I have the following commands: #!/bin/sh rm testfile.x dd if=/dev/zero of=testfile.x bs=1M count=1200 losetup ...
3
votes
0answers
82 views

adding encrypted /home in LVM/LUKS

I installed a new (debian) system to an SSD device. After standard install I want to mount /home on the internal HDD. To be able to ask the question, some details: On install I (manually) generated ...
2
votes
1answer
450 views

Unlock LUKS encrypted Debian root with key file on boot partition

I'm trying to decrypt the Debian root with a key file stored in the boot partition (decrypted partition). This will break the security, but it doesn't matter now. I have to conclude this successfully ...
3
votes
0answers
161 views

remap read-only LUKS partition to read-write

cryptsetup can be invoked with --readonly or -r option, which will set up a read-only mapping: cryptsetup --readonly luksOpen /dev/sdb1 sdb1 Once I have opened a device as read-only, can I later ...
0
votes
1answer
39 views

setting default options for cryptsetup

Is there a way to set default options for cryptsetup? For example, lets say I want to make sure that I only open cryptsetup devices with the -r option. I would like to add it to a config file, so that ...
0
votes
1answer
634 views

Encrypted ArchLinux: unable to find root device

I have a problem with my new installation of ArchLinux with an encrypted partition. I guess I have done the same steps as before and it works on my other machine. The error message I get is: ERROR: ...
0
votes
1answer
24 views

Archlinux ARM Rasperry Pi decryption fail

I have created an encrypted Archlinux partition on my SD card, but currently I am unable to decrypt it. I am using the key "Xö&(4n=%YF3Ü!BN" which includes german letters. So for this I have ...
1
vote
1answer
89 views

Archlinux ARM Rasperry Pi login buffer display and decryption fail

I have put the Archlinux Arm on my SD card and the first time I have done this it was all correct and worked well but I had to "reinstall" everything for several reason. So now I am doing the same ...
0
votes
1answer
121 views

Storing a keyfile in an encrypted LVM

I'm using RHEL 6.5 and I want to encrypt some of my logical volumes (LVM). In order to not have to enter the passphrase multiple times, I want to store a keyfile in an encrypted LV. Example: ...
0
votes
1answer
58 views

How to add a progress bar to cryptsetup luksFormat?

Example command. cryptsetup --hash sha512 -c aes-xts-plain64 --key-size 512 luksFormat /dev/loop0 This can take quite a while for big files / on slow disks. How to add a progress bar?
1
vote
0answers
1k views

Accessed a TrueCrypt container without TrueCrypt. What dangers await?

I've got a TrueCrypt volume. In light of the unexpected demise of TrueCrypt, I've been trying to figure out what to do (reading lots of HOWTO websites). I'd like something that is simple and can work ...
1
vote
1answer
149 views

Backup LUKS (cryptsetup Command) partition or volume

Can you create a file container/volume in LUKS in the same way that you could do with Truecrypt? Otherwise, how can you backup a LUKS partition? Do you have to clone it, for example with dd? or backup ...
2
votes
1answer
262 views

LUKS: Enter passphrase and nothing happens

I've installed gentoo on my new laptop. I've got an LUKS-encrypted root partition (/dev/sda3). Cryptsetup (USE="gcrypt") is installed. Essential cryptographic API is compiled in kernel. Kernel and ...
0
votes
1answer
186 views

How do you encrypt a USB drive partition with the Twofish cipher and SHA-512 hash without using TrueCrypt? [closed]

I've been trying to string together the right flags in cryptsetup: cryptsetup -y -h sha512 -c twofish-xts-plain64 -s 512 luksFormat /dev/sdx But it hasn't been working. When I enter the command ...
1
vote
3answers
588 views

How much storage overhead comes along with cryptsetup and ext4?

I want to encrypt the content of a directory in a container with an ext4 filesystem using cryptsetup. The size of the container should be as small as possible and as big as necessary, because I only ...
1
vote
1answer
185 views

Cryptsetup: pre-fill the partition with random data

It says it is an optional step, but it is recommended to do this, it improves encryption to pre-fill the partition with random data. What brings security filled with random data? Is it more difficult ...
3
votes
1answer
636 views

How to open multiple LUKS volumes with key entered in initramfs?

I have a Debian 7.4 (stable) based server configured to use an encrypted (RAID1 + LVM) root partition (/boot is un-encrypted regular partition) to which I installed dropbear SSH server so I can ...
2
votes
1answer
297 views

How can move a LUKS container from the middle of a partition to the beginning?

For the tl;dr, skip to the bottom. I have a dual-boot setup with Mac OS X at the beginning of my drive and three GNU/Linux partitions at the end of the drive. I don't have the relevant machine on ...
1
vote
0answers
79 views

How to install linux (with crypto /Home + / partition) with enough swap space to hibernate

What are the steps to install Linux (with cryoto /Home + / partition) Mint on a empty hard drive with 1.5x swap space as RAM. I am aware that the CD allows this as a default option but it doesn't ...
1
vote
0answers
16 views

How to ask for a password to mount crypted swap at boot time on Linux Mint 16 with initramfs-tools? [duplicate]

I use encrypted home folders on my notebook, which prevents use of hibernation on standard setup, because - and for a good reason - besides encrypting the home folder with ecryptfs, it reformats the ...
3
votes
0answers
473 views

Unable to close a Luks partition

For backup purposes, I have "snapshotted" a LVM partition. This partition was crypted so I have opened this Luks partition (snapshot) in order to do my backup. The problem is that I have forgotten to ...
0
votes
0answers
163 views

LUKS - changing passphrase with /dev/mapper/fedora-root

I would like to change my passphrase in LUKS, so I started with typing mount | grep 'on / '. The result was /dev/mapper/fedora-root on / type ext4 (rw,relatime,seclabel,data=ordered). So next as usual ...
6
votes
1answer
639 views

Trying to understand LUKS encryption

I decided to encrypt my root partition with LUKS+LVM. My ThinkPad setup: Samsung 830 128GB SSD 750GB HDD Core 2 Duo 2,5 GHz P9500 8GB RAM But the more I read, the less I understand about those ...
5
votes
1answer
9k views

Why my encrypted LVM volume (LUKS device) won't mount at boot time?

I'm trying to setup an encrypted volume following this guide Everything is setup but mounting the encrypted volume fails at boot-time with the error: fsck.ext4: No such file or directory while ...
3
votes
1answer
303 views

cryptdisks_start: precheck failed: the device contains a filesystem type crypto_LUKS

I'm trying to use cryptdisks_start to open a LUKS device that is defined in my /etc/crypttab. Unfortunately, the command fails with the following error message: martin ~ # cryptdisks_start ...
3
votes
1answer
355 views

Open luks-encrypted partition from virtual DomU LVM disk containing another LVM

I've gotten myself in a bit of a bind, here. A while ago I set up an encrypted Unbuntu 13.04 under Xen. It's virtual disk is an LVM LV. This LV was presented to the DomU as a (whole) physical disk ...
2
votes
1answer
968 views

Booting encrypted root partion fails after system update

I have a problem booting my Debian Linux server. After a system update, GRUB loads the initrd and the system should ask for the password, but it doesn't. Instead, I get dropped to BusyBox. After ...
0
votes
1answer
242 views

How to remove LUKS auto-unlock?

Unfortunately my drive unlocks automatically. This makes the whole encryption useless. How do I turn off this annoying feature on a specified drive (e.g. /dev/x) ? The cryptsetup command I've found ...
3
votes
1answer
2k views

LUKS storing keyfile in encrypted usb drive

I already asked once about LUKS unlocking of multiple HDDs in Linux: LUKS and multiple hard drives. Now I would like to know how to secure store the keyfile used for the automatic unlock of the ...
2
votes
2answers
303 views

Automatically suspend luks volume after delay

Anyone have any ideas for how I can automatically do a luksSuspend on a luks volume after it's been unused for a certain amount of time. I was thinking of just scheduling a command with crontab or ...
1
vote
1answer
107 views

Prevent file access from hanging when luks volume is suspended

I've got a luks volume setup and mounted, and when not in use I suspend it with cryptsetup luksSuspend so it cannot be accessed. But if I forget it's suspended and try to do any kind of file access in ...
8
votes
2answers
4k views

How to mount a cryptsetup container just with `mount`?

I created an encrypted container via #!/bin/bash dd if=/dev/zero of=$1 bs=1 count=0 seek=$2 MAPPER=$(mktemp -up /dev/mapper) LOOPDEV=$(losetup --find --show $1) cryptsetup luksFormat $LOOPDEV ...
3
votes
1answer
9k views

How can I shrink a LUKS partition, what does `cryptsetup resize` do?

I am in progress of resizing a LUKS encrypted partition that contains a single ext4 filesystem (no LVM or something). The cryptsetup FAQ recommends to remove the old partition and recreate it, but ...
6
votes
1answer
310 views

Cryptsetup not finding libgcrypt.so after upgrade

I am running a Fedora Core 13 with dm-crypt + luks, all standard with fedora distos. After upgrading libgcrypt.so, cryptsetup moans at boot up that it can not find the library where it expects it to ...