Veracrypt password cracker
Decrypting disks encrypted with veracrypt
I had planned to upload a 10MB encrypted volume that I created with Veracrypt to the internet. I have a fairly powerful password, but I was concerned about its resistance to brute force attacks. After looking through this SE, it appears that a Veracrypt encrypted volume can be brute forced easily ref1, ref2. If that’s the case, with enough money, we can crack any encrypted volume with any length password (>100) in days instead of years using parallel brute-force.
Is there some kind of brute force defense built into Veracrypt encrypted volumes? Didn’t the developers of Veracrypt know about this problem? Is there any good encrypting device that protects against brute force attacks?
Any encryption is vulnerable to a brute force attack; for example, AES-256 has 2256 keys, which we can “easily” brute force with enough hardware. The issue is that there isn’t enough silicon on Earth to create enough processors before the universe’s heat death. We can thank probability theory for this;) The fact that encryption can be bruteforced does not guarantee that it will happen in a reasonable period of time.
How to access encrypted drive using efdd (without password)
VeraCrypt is used in a corporate/enterprise environment. Is it possible for an administrator to reset a volume password or pre-boot authentication password if a user forgets it (or misplaces a keyfile)?
Yes, indeed. It’s worth noting that VeraCrypt doesn’t have a “backdoor.” However, volume passwords/keyfiles and pre-boot authentication passwords may be “reset.” Until allowing a non-admin user to use a volume, back up the volume’s header to a file (select Tools -> Backup Volume Header). The master key for encrypting the volume is included in the volume header (which is encrypted with a header key extracted from a password/keyfile). Then, either ask the user to select a password and set it for him (Volumes -> Change Volume Password) or create a user keyfile for him. The user can then use the volume and change the password/keyfiles without needing your help or permission. You can “reset” the volume password/keyfiles to your original admin password/keyfiles by restoring the volume header from the backup file (Tools -> Restore Volume Header).
18-11-2019 LUKS/dm-crypt password cracking Dm-crypt is a Linux package that provides transparent disk or partition encryption. What are your choices if you need to retrieve a password that has been encrypted? There are already ready-made tools, but in order to support newer LUKS formats/ciphers/hashing, we created and released our own.
In the Linux kernel, dm-crypt is a transparent disk encryption subsystem. It’s implemented as a device mapper transformation objective that can be stacked on top of others. As a result, it can encrypt entire disks (including removable media), partitions, device RAID volumes, logical volumes, and data. It appears as a block device that can back up file systems, swap, or function as an LVM physical volume.
Dm-crypt/cryptsetup supports a variety of formats and styles (current version supports luks, luks1, luks2, plain, loopaes, and tcrypt), but the most popular are LUKS1 and LUKS2, with LUKS2 being a newer format that uses argon2i by default. TrueCrypt/VeraCrypt are also supported by cryptsetup, which is a lesser known reality. The following are the standard cryptsetup defaults:
Brute force password cracking with hashcat
I encrypted a few files with Truecrypt 7.1 a while ago, but didn’t write down the password and kept it in my mind. That was a huge blunder. When I wanted access to those files after a while, the password was no longer working. I’m certain that the majority of the password was right, but I was off by two or four digits, despite the fact that the entire password was 25 characters long. After a few failed attempts, I decided to look for software that would enable me to brute force the encrypted container using specific keywords or regular expressions. OTFBrutusGUI is the app that can manage both.
Passware Kit extracts all the encryption keys from the physical memory image file (acquired while the encrypted disk was loaded, even if the target machine was locked), and decrypts the given amount. Passware FireWire Memory Imager (included in Passware Kit Forensic) or third-party tools like ManTech Physical Memory Dump Utility or win32dd can be used to obtain such memory files.
The encryption keys are not kept in memory if the target machine with the encrypted volume is turned off, but they can be retrieved from the hiberfil.sys register, which is generated automatically when a device hibernates.