Skul

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Introduction

Skul is a PoC to bruteforce the Cryptsetup implementation of Linux Unified Key Setup (LUKS).

Read about it here.

Features

Most relevant features included in this release:

• Fast PBKDF2 implementation: we make use of fastpbkdf2, the most powerfull CPU-based implementation of PBKDF2.
• Multi-thread support
• Fast master key check: enables the speed-up of the attack up to 20%
• Configurable incremental bruteforce attack mode
• Password-list attack mode

Prerequisites

To run Skul the OpenSSL library is required.

Build Skul

$ ./configure 
$ make skul 

Usage

To test Skul we provide an example header of cryptsetup's encrypted disks:

$ ./skul disks/test_disk_py 

To test your own disk you need to dump the LUKS header of the partition:

# dd if=/dev/sdX of=./my_dump bs=1024 count=3072
# chmod myusr:myusr ./my_dump

Then you can run:

$ ./skul ./my_dump

You can configure Skul thruogh its configuration file conf/skul.cfg