Questions tagged [luks]
LUKS (Linux Unified Key Setup) is a disk-encryption specification.
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Have I used LUKS properly?
I am about to go travelling to some high risk countries where corrupt officials will most likely try to go through my laptop and external HDD.
I am using Linux Mint and LUKS. Could someone please ...
2
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0answers
36 views
How to secure remote console LUKS passphrase entry?
Say I have a Linux server running on my own metal and wish to encrypt the hard drive using LUKS.
After a power failure, how can I enter my passphrase remotely without compromising it?
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1answer
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LVM on LUKS implementation [closed]
LVM on LUKS is the only secure option for encrypting a Linux/Ubuntu USB system. If someone gets access to an unencrypted USB that's not LVM on LUKS they know what it is and what's on it.
However LVM ...
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0answers
243 views
Use TPM 2.0 to automatically decrypt the SD Card in Raspbian OS
I'm a college student trying to complete the first part of a rather large project, but I'm new to TPM, and Linux. What I'm trying to do is have TPM handle automatic decryption of the root ext4 ...
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1answer
119 views
Is the following protocol a good method for encrypting a non-OS hdd? [closed]
I find the following somewhat confusing, but it doesn't have many steps. Is this a solid method for encrypting a hdd with LUKS?
Here’s the process in few steps:
Create a LUKS partition
...
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1answer
247 views
Are there any risks from cloning a LUKS encrypted partition?
I'm using an installation of Ubuntu server on disk, with some extra packages installed and configuration carried out, on disk as a kind of base image for repeatedly creating other systems. I clone ...
2
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3answers
136 views
Should I upgrade old volumes to new cryptsetup encryption mode?
The old cryptsetup default is aes-cbc-essiv:sha256. The new one is aes-xts-plain64:sha256. I don't know that much about cryptography but I assume the standard was changed for a reason.
Also there can ...
2
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0answers
38 views
Best luks setup disk [duplicate]
I want to encrypt my disk but I want to know what is the best configuration, I currently use ths:
cryptsetup -v --cipher serpent-xts-plain64 --key-size 512 --key-file=- --hash whirlpool --iter-time ...
1
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1answer
128 views
Is double encrypting with AES safe?
Is it safe to encrypt twice with AES, with any mode? Are any combinations of AES, e.g. AES with XTS and AES with CBC, or twice with AES and XTS, more unsafe than just having it encrypted once?
I know ...
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0answers
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LUKS mitigate brute force attacks even if salt parameter is know?
From What users should know about
Full Disk Encryption based on LUKS
In Linux world, LUKS implementations are based on cryptsetup and
dm-crypt. In order to mitigate the problem of brute ...
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0answers
46 views
LUKS partition encryption vs. .vmdk level encryption
Because of data classification that is stored on one of our servers we need to make sure that it is protected while in transit and at rest. While the first can be addressed with proper TLS ...
3
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1answer
178 views
Is suspend-to-ram really a meaningful risk for Full Disk Encryption?
Ubuntu offers full disk encryption relying on luks. An often recurring area of criticism is the fact that Ubuntu disables hibernation by default while suspend-to-ram stores the private keys in the ram ...
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1answer
107 views
security of cryptsetup(8) luksRemoveKey, feasibility of extracting MasterSecretKey and using it later
I looked at https://crypto.stackexchange.com/a/24024 and it seems to me cryptsetup(8) luksRemoveKey is weak.
The situation:
I create new LUKS volume, copy stuff into it.
I add a new pass phrase, and ...
2
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1answer
486 views
Is it possible to LUKS require both password and key file?
My goal is to be able easily destroy medium with key file in emergency situation and make system unbootable, even is potential advisor knows right password for the system. I'd store this key file in ...
0
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1answer
234 views
dm-crypt/LUKS: one-time password
I've setup arch using dm-crypt / luks, with a passphrase and a key, lost one of them will fail to login.
But I feel I need more secure of passphrase, how to setup dm-crypt / luks that has one-time ...
3
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1answer
155 views
Can information somehow be secured from the host on a KVM guest?
With KVM guest systems so prevalent now, I was wondering if there is any merit in using LUKS encrypted storage, as the guest will usually be always on, so the information is always accessible ...
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2answers
64 views
Using command (dd if=/dev/mmcblk0p1 | sha1sum) while running from initramfs
I have an opensource airgapped raspberry pi project seen at the following link: www.privatekeyvault.com
I have provided a method for installing LUKS full disk encryption seen at the following: https:/...
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1answer
55 views
Security/Privacy OS With Boot On Thumbdrive
I am looking for a security-centered Linux OS that allows you to take the /boot partition on a thumb-drive to alleviate concerns of an Evil Maid Attacks! What OS is it easy to remove the /boot ...
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4answers
244 views
Are multiple encrypted containers with the same passphase containing the same files a cryptographic risk?
Situation as follows:
Let's assume two (or more) containers, encrypted using the same passphrase.
They will contain the same files. So their content is identical.
However, the containers themselves ...
1
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0answers
369 views
Automatic fetch Luks keyfile over ssh and decrypt partition [closed]
I run a small computer with an encrypted data partition.
So that I have as little effort as possible to decrypt the hard disk after a reboot (no extra ssh login, password input etc.), I thought about ...
4
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1answer
195 views
Does full disk encryption offer mitigation in the case of the firmware of an SSD being compromised?
Suppose the firmware of an SSD or HDD has been compromised by rogue actors either through "interdiction" (interception) or via the internet. They are able to exfiltrate data and conduct surveillance ...
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2answers
181 views
How does default Debian boot drive encryption works?
When installing Debian, I chose an option to create Encrypted LVM (Logical Volume Management). So now, when I turn on my PC, it asks me for an encryption password.
It looks ok, but how does it work? ...
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1answer
2k views
Use TPM2.0 to securely decrypt the hard drive in Linux — unattended
I spent several days trying to figure out how to securely decrypt a hard drive on remote location using TPM2.0 in Linux. I'm no security expert and this is my first battle with TPM2.0. I learned a lot,...
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1answer
558 views
Full disk encryption vs file based encryption
I need to protect a few hundred thousand files stored on a drive on a Linux server. I am thinking full disk encryption with file encryption on top would be the best option. Failing that, file based ...
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1answer
147 views
Can government authorities retrieve data from LUKS volume when it's accessed while turned on? [duplicate]
I've heard that there are attacks that can get passwords out of RAM while turned on.
If a server, CentOS 7.5 and LUKS enabled, it's tty1 locked, which is on a VMWare hypervisor that is locked with a ...
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2answers
498 views
Luks+Sleep: Login screen security?
Situation: A Desktop Linux (eg. Debian, Xfce desktop, Lightdm login) with LUKS-encrypted partitions (as far as possible, eg. Efi files are not encrypted of course).
The computer is in sleep mode (not ...
3
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1answer
2k views
LUKS2 dm-integrity
I am using Debian 9.5, Linux Kernel 4.16, I would like to use the dm-integrity feature with cryptsetup.
cryptsetup luksFormat --type luks2 <device> --cipher aes-gcm-random --integrity aead
...
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1answer
253 views
dmcryt_write process in TOP but no WRDSK indicated
I am using LUKS over RAID0. I have executed cryptsetup -v --cipher aes-xts-plain64 --key-size 512 --hash sha256 --iter-time 2000 --use-urandom --verify-passphrase luksFormat /dev/md0
Everything ...
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1answer
485 views
If a LUKS encrypted VM is put in saved state, will the master key be in clear on the host?
Let's assume the host is not encrypted, and all files on it are accessible. A VM with LUKS encryption is saved, meaning its memory is now residing as a regular file on the host, does that memory also ...
2
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1answer
91 views
recommendation to change encrypted-drive passphrases
There are numerous recommendations for how frequently to change users' passphrases, and I think the most recent NIST recommendation is "no minimum time to change passwords" (I might be mis-quoting). ...
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1answer
318 views
Automatically Open LUKS Container on System Boot in a safe manner
I have a linux system running at a cloud provider where I created an encrypted container using LUKS to store personal data.
The encrypted container is manually mounted at /srv; the rest of the ...
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1answer
843 views
Limit of 256 bit drive encryption? 512 needed for large drives?
I am building an encrypted NAS with 4 x 4TB hard drives and was wondering what the limit of 256 bit AES is when implemented via cryptsetup and luksFormat. As I understand it, the maximum plaintext ...
2
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1answer
2k views
LUKS2 on-disk format specifications
The LUKS1 format has been available for a long time, and the format specifications are easy to find. Recently, LUKS2 has been released, which features a number of important changes, such as AEAD and ...
2
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1answer
151 views
Wiping data properly in LUKS encrypted drive
Is it enough just to remove the header of LUKS device to wiping (unrecognizable) the data completely? Or it is recoverable (I don't want to recover though)? I need some safeguard to wiping my ...
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3answers
1k views
If I switch to LUKS on an SSD, have I just wiped it?
I have been using an SSD with no system-level encryption. If I now switch to full disk encryption using LUKS + LVM, do I effectively wipe the old data, or is it still hanging around until overwritten?
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3answers
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How secure is my logged out but not shut down luks HD
I'am running a Ubuntu 16.04 on a luks encrypted disk. Normally when I leave my machine for some minutes, I always shut it down to be safe with the luks encryption. But I wonder, what the possible ...
3
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1answer
385 views
What’s the security risk when setting the Gnome keyring password to blank on an FED system with autologin?
My system disk is full encrypted with luks. My Ubuntu logs in automatically, because I am the only user. But I still need to unlock my Gnome Keyring and I wonder, if there is any sense for that. ...
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1answer
439 views
LUKS overwrite empty disk space question
I have a question about LUKS and the overwrite empty disk space option. I know what it does, and why people use it but I have a question about it. Forgive me if this question is dumb, it's just ...
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1answer
198 views
What information can be found about a LUKS-encrypted drive?
Let's say someone found a USB drive at their home and wants to try to figure out what it is (and they don't know the encryption phrase). What information could be determined about this encrypted drive,...
2
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1answer
679 views
Resetting LUKS password from CLI with the recovery key
I have a dd of a computer which has a LUKS-encrypted partition. I do not have the password but I do have a recovery key which would allow me to change the password through a GUI interface when the ...
5
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2answers
944 views
Why does LUKS use CBC?
I read that LUKS uses 256-bit AES with CBC by default. CBC, of course, has the disadvantages that if you change something in the plain text, you have to change everything that comes after it. In the ...
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3answers
103 views
Security of different Filesystems
Are there any preferred filesystems that have some boni regarding security and confidentiality? Or does it really not matter if I, for example, encrypt a HDD with LUKS?
As an example, I read that the ...
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1answer
306 views
cryptsetup luksHeaderBackup file smaller than Payload Offset?
I created test LUKs container in a file, the luksDump says
MK bits: 256
Payload offset: 4096
implying that the header is 4096*512 = 2MiB
but the file produced by
cryptsetup ...
0
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1answer
341 views
Preventing LUKS key dump
Is it possible to prevent a root user (user space) from running dmsetup table --showkeys to dump the LUKS master key?
I know of the TRESOR patch which essentially prevents the key from persisting in ...
5
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1answer
106 views
Does mounting a LUKS partition authenticate it?
Can I be sure that the (unencrypted) contents of my LUKS volume were not tampered with if it accepts my passhprase on an otherwise trusted system?
In other words, can an attacker with access to my ...
0
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1answer
353 views
Access encrypted files (dm-crypt/LUKS) through web app
I'm a newbie to encryption issues and I'm trying to sort out a few questions.
For a distributed application we need to deploy a server outside of our company with sensitives PDF files on it. That ...
0
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1answer
162 views
Mapping of encrypted to decrypted blocks in LUKS
Section 2.4 What is the difference between "plain" and LUKS format? of the cryptsetup Frequently Asked Questions says the primary advantage of plain dm-crypt (no LUKS) is:
...high resilience to ...
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2answers
600 views
Is deleting LUKS keys during operation a good way to protect my data?
Let's say Alice owns a server that stores highly sensitive data. Let's further assume the data is worth a lot, but losing all data is way less of a problem than having it read by attacker Mallet.
To ...
3
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1answer
325 views
Is scrubbing a ssd drive effective in situations where you can't use the trim command?
I have a luks encrypted external usb ssd drive (Samsung T3) which is unable to use the trim command. This leaves me to search for a different way to securely erase the free space inside the encrypted ...
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2answers
3k views
Is LUKS effective?
I ask this because encrypting an hard drive using LUKS takes a few seconds while encrypting the same drive using Bitlocker takes several hours. Does that mean LUKS encryption is weaker?
