The tag has no usage guidance.

learn more… | top users | synonyms

-1
votes
0answers
18 views

What is the kernel parameter to specify the path to detached luks header?

I'm tyring to setup a encrypted root with the luks header on a usb device. So I have to pass a kernel parameter telling the path to the file containing the header but I can't find it. I know that ...
-1
votes
0answers
8 views

What is the kernel parameter to specify the luks header location?

I know that when your root is encrypted and your passphrase is on a keyfile you can tell the kernel the location of that keyfile using the parameter : cryptkey=/dev/<partition2>:<fstype>:&...
1
vote
1answer
16 views

How to stop cryptsetup luksFormat from creating the luks header on the encrypted device?

I'm trying to setup a partition and I'm trying to put the luks header on a USB device so I use the argument --header /path/to/usb-device, however I am still able to decrypt the device without the usb-...
1
vote
0answers
10 views

Kali GNU/Linux Rolling 64-bit - Dropbear CryptSetup Wireless Setup Problem

I would like to ask for help in figuring out how to get the IP-Config program that shows up when attempting to use dropbear from guides such as this question to allow me to use wlan0 instead of eth0 ...
2
votes
0answers
30 views

Cryptsetup hanging after passphrase entered

I am currently looking to recover some data for a friend from an internal HDD removed from a laptop that they had encrypted using LUKS. They can't really tell me much more else as somebody else ...
3
votes
1answer
37 views

LUKS: 1 master key but multiple passwords and key files?

After reading "man cryptsetup" and many StackExchange questions, I'm confused: Does LUKS use the same master key in each slot? If I execute the commands below, the displayed master key does not ...
1
vote
1answer
53 views

why does systemd cryptsetup try to remount the root partition already mounted?

I have /etc/crypttab as follows: sda7_crypt UUID=<...> /dev/sda8:/keyfile luks,discard,keyscript=/lib/esi/tpm_key_pass sda7_crypt is my root filesystem, so I use update-initramfs to decrypt ...
1
vote
0answers
96 views

Initramfs in debootstrap chroot of fully encrypted system

I'm working on a script to create a fully encrypted washable system from debootstrap. It's doing some good, but the initramfs image that comes out does not pick up the cryptroot properly. After ...
0
votes
0answers
14 views

Cryptsetup boot many devices “timeout”

On my server, the crypttab file has 13 entries for every hard drive connected to it. 2 are for the system partitions, 2 are for the backup system and 9 are for the mediaserver and nfs stuff. Currently,...
0
votes
1answer
34 views

How do can I tell what encryption is being used with signed in luks?

What command tells you what encryption is being used by a luks partition (all the relevant information initialization vector generation scheme, mode of operation and block cipher primitive).
1
vote
1answer
69 views

Cryptsetup: LVM is missing (on a system without LVM)

So, I have a problem with the partitions setup of my laptop. I will try to include as many details as possible in order to make it easier to help. In the past, I had an ubuntu 15.10 system on my ...
1
vote
1answer
436 views

howto interpret `cryptsetup benchmark` results?

summary: I can run cryptsetup benchmark and sort the results, but seek guidance in their interpretation. E.g., should I give more weight to encryption speed or decryption speed? Should key-derivation ...
1
vote
1answer
118 views

Unable to remove stale volume

I have an external hard drive connected to my Ubuntu laptop via USB. The whole hard drive is LUKS encrypted. Next to the encryption layer sits an LVM volume which I mount to /mnt/es. Once opened, ...
1
vote
2answers
118 views

cryptsetup: Attaching loopback device failed

I am using cryptsetup with detached header. For that I am using the --header parameter, to specify header file. I can open my device using: cryptsetup luksOpen /dev/sdb1 sdb1 --header LUKS-HEADER ...
0
votes
1answer
59 views

Decrypting a previously create losetup device

I've created an encrypted backup in 2004, using losetup -e. I still know the passphrase, so I should be fine, but losetup is gone in the linux distributions I use. I still have a bash script for ...
1
vote
1answer
163 views

Encrypt partition and allow qemu to use it as the guest drive

I am trying to encrypt a 25gb partition on my SSD with cryptsetup in such a way that will allow QEMU-KVM to use it as the guests drive. I have tried luksformatting the drive: cryptsetup luksFormat /...
1
vote
1answer
102 views

Waiting long (few minutes) during boot for cryptsetup for password prompt

I have LVM on the top cryptsetup on my Debian unstable amd64. A week ago after upgrade my initramfs changed and now I have to wait few minutes at the beginning of the boot before cryptsetup asked for ...
2
votes
1answer
27 views

Is there an equivalent of mount -a for cryptsetup?

mount -a will ensure everything in /etc/fstab is mounted (except for noauto entries). Is there an equivalent for cryptsetup, which will unlock everything in /etc/crypttab?
3
votes
2answers
838 views

How can I set a label on a dm-crypt+LUKS container?

I just received a new USB flash drive, and set up 2 encrypted partitions on it. I used dm-crypt (LUKS mode) through cryptsetup. With an additional non-encrypted partition, the drive has the following ...
2
votes
0answers
121 views

LVM partition not mounting

There was a drive failure on a disk in a RAID1 configuration. I removed the bad disk and reconfigured the RAID1 to only use the good disk. When I reboot the machine there are missing LVM partitions. ...
5
votes
2answers
135 views

Creating a large file with random content: short-cut by copying?

Assume I want to create a large encrypted drive stored in a file using cryptsetup, the first step is to create a random file, assume this should be of size 3T: dd if=/dev/urandom of=$FILE bs=1G count=...
1
vote
1answer
719 views

Enabling FIPS on a luks encrypted CentOS system breaks boot password

For one of my apps I need to enable FIPS for OpenSSL, while simultaneously using software disk encryption. VM #1 I launched a CentOS VM instance which was software encrypted during install. The ...
0
votes
0answers
39 views

Zenity, how to manage cryptsetup prompt?

With Zenity, I display a progressBar and install/config many stuff on a Linux Mint (Debian) computer. I had to avoid any prompt. But one step prompts Enter a passphrase:, this is cryptsetup ...
0
votes
2answers
246 views

How to automate cryptsetup-luksAddKey with passphrase?

Context: I replaced my passphrase prompted at launch by a keyfile, stored on a USB dongle. My question concerns the step: # cryptsetup luksAddKey /path/to/mykeyfile . I generated my added key is ...
1
vote
1answer
309 views

luks volume disappears after reboot

I created a separate partition on a CentOS install (VirtualBox), and am attempting to encrypt it using cryptsetup and LUKS. I'm using the following commands to get this set up: cryptsetup luksOpen /...
1
vote
0answers
331 views

Difference between cryptopts and crypttab

I'm setting up an encrypted root fs, which I've done before, but this time I'm using a PGP-encrypted keyfile with a symmetric password to familiarize myself with the process. There are two places ...
4
votes
1answer
728 views

cryptsetup: dm-crypt plain mode using keyfile AND passphrase

I feel a keyfile and a passphrase provide different benefits. They can not be obtained in the same way (one you need to physically acquire, the other one you need to know). Thus, I think there is ...
5
votes
1answer
2k 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 ...
1
vote
0answers
532 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
507 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 : ...
7
votes
1answer
1k 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?
4
votes
2answers
701 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
488 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
499 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
531 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
156 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 /...
4
votes
3answers
2k 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
481 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 re-...
0
votes
1answer
62 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
2k 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
28 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
117 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 ...
1
vote
1answer
242 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: /var/...
1
vote
1answer
104 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?
2
votes
0answers
2k 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
195 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
477 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
293 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 ...
3
votes
3answers
1k 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
304 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 ...