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1
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3answers
47 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
30 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
64 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
22 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
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0answers
24 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
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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
28 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
30 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 ...
5
votes
1answer
117 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
433 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
110 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
144 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 ...
1
vote
1answer
305 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
152 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
1k 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
161 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
73 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 ...
7
votes
2answers
2k 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
5k 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 ...