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Aproximace doby výpočtu distribuovaných úloh pro lámání hesel
Jadrná, Lucie ; Horák, Adam (referee) ; Hranický, Radek (advisor)
This thesis focuses on improving the accuracy of password cracking time estimation in the distributed system Fitcrack. Based on the analysis of the current solution, key factors influencing the accuracy of computation were identified, and a set of algorithms was proposed to refine the estimation. Conducted experiments confirmed the effectiveness of the proposed algorithms, with the new solution bringing significant improvement in the accuracy of cracking time estimation in 90.32 % of measured tasks, including brute-force attack, dictionary attack, combination attack and hybrid attacks.
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Automated planning of password cracking tasks
Brandšteter, David ; Horák, Adam (referee) ; Hranický, Radek (advisor)
This thesis aims to design and implement an extension module for the Fitcrack system. The extension is meant to help the user who is time-limited and can’t or is unable to estimate the duration of the attack. The extension is also helpful for the user who does not want to spend time setting up individual attacks. It is an automated scheduler that, based on a given time, creates several attacks, whose duration will correspond to the time required by the user. The planner’s output is a prepared set of attacks in the form of a batch, ready for use. Later in this thesis, there are described experiments that were used to verify the applicability of the solution.
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Optimalizace vysoce náročných úloh v systému Fitcrack
Dacík, Ondřej ; Horák, Adam (referee) ; Hranický, Radek (advisor)
The aim of this thesis is to design and implement optimizations for Fitcrack, a distributed password cracking tool. First, a set of computational tasks was created on which computation time and CPU utilization were measured. Problematic areas of the tool were then identified from the results, for which modifications were proposed and implemented to increase the cracking efficiency by a more appropriate task distribution and reduced communication overhead. They concern work with a large number of masks and password mangling rules, optional benchmark skipping and sharing cracked hashes across jobs. The benefit of these changes is finally shown in experiments where the modified version of the tool is compared with the original version. For jobs with a large number of masks, speedups of up to 37 % were achieved, and for the combination of a small dictionary, many rules and computationally intensive hashes, it was possible to reduce the duration of jobs by up to 180 times compared to the original version of the tool.
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Password Cracking Using PRINCE Algorithm and Fitcrack System
Bolvanský, Dávid ; Ryšavý, Ondřej (referee) ; Hranický, Radek (advisor)
The PRINCE algorithm is a faster and more advanced version of a combination attack. Non-distributed password breaking often encounters its limits, and its applicability to real tasks decreases due to the increasing demand for computing resources of the device. The aim of this work is to design a distributed version of the the PRINCE attack as an extension of Fitcrack system, which focuses on distributed password cracking. The proposed design is implemented and integrated into the Fitcrack system. The work examines the PRINCE attack on a set of experiments, which examines the impact of various configuration options. Part of the experimental part is a comparison of the PRINCE attack with the dictionary and combination attack. The purpose of the comparison is to find cases where the PRINCE attack is better than other attacks. Finally, the integrated PRINCE attack solution in the Fitcrack system is compared with the solution implemented in the Hashtopolis system.
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Optimization of Task Distribution in Fitcrack System
Ženčák, Tomáš ; Ryšavý, Ondřej (referee) ; Hranický, Radek (advisor)
The goal of this thesis is the optimization of task distribution in the Fitcrack system. The improvement is reached by way of increasing the accuracy of the estimation of the computational power of worker nodes, and the prevention of the creation of extremely small tasks, as well as increasing the efficiency of the transfer of the tasks to the worker nodes. In this thesis, the current state of the Fitcrack system is described, tested, and evaluated. This thesis then describes the weak points of the current implementation, proposes ways of remediating them and describes, tests and evaluates the implementation of those proposals.
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Web Application for Remote Administration of Fitcrack System
Múčka, Matúš ; Veselý, Vladimír (referee) ; Hranický, Radek (advisor)
This thesis aims to solve the design and the implementation of a web application for the remote administration of Fitcrack system. Fitcrack is a system that is used for distributed password recovery. The server part of the web application is designed using REST architecture that reduces server load while simplifying system testing. The presentation layer of the system is implemented as a single-page application. It communicates with the server part using asynchronous requests (AJAX), whose content is in the JSON format. The web application contains a pleasantly responsive user interface, a user system with privileges, and various advanced graphical elements, such as charts.
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Automated Testing of Fitcrack System
Chripko, Juraj ; Polčák, Libor (referee) ; Hranický, Radek (advisor)
This thesis aims to design and implement automated tests for Fitcrack, distributed password cracking system based on BOINC platfrom. White-box testing is used, specifically requirements-based testing. At the begining of the thesis, general testing practices are explained, followed by principles of requirement based testing which is the basis of practical part. Thesis also includes a description of the Fitcrack architecture, the design of tests, selected details of the implementation and chapter about testing itself and tests results.
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Strategies for Distributed Password Cracking
Večeřa, Vojtěch ; Pluskal, Jan (referee) ; Veselý, Vladimír (advisor)
This thesis introduces viable password recovery tools and their categories as well as the technologies and hardware commonly used in this field of informatics. It follows by an overview of the available benchmarking tools for the given hardware. Thesis later contains a description of the custom benchmarking process targeting the aspects of interest. Later, the thesis moves to a distributed system FITcrack as it proposes and experimentally implements new features. The thesis finishes by comparison of the additions against the original state and highlights the areas of improvement.
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Administration of Computing Tasks in Fitcrack System
Horák, Adam ; Zobal, Lukáš (referee) ; Hranický, Radek (advisor)
The aim of this thesis is to design and implement extensions for the Fitcrack system management application. The system is used to crack hashes and recover passwords from encrypted files. It works by distributing computation tasks across multiple computers and includes many configuration options. The extensions outlined in this thesis are meant to aid the user in creating and working with jobs in the system. These include grouping jobs, batch running, and exporting to a file.
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Attack on Encrypted Disk Volumes Using GPU
Sedlo, Ondřej ; Holkovič, Martin (referee) ; Hranický, Radek (advisor)
The aim of this thesis is to create an extension of the Fitcrack tool, which will recover passwords from disk volumes encrypted by TrueCrypt. The introduction part describes the Fitcrack tool which is used for password recovery and supports many different formats of files, and OpenCL framework which is used for computation acceleration. The thesis also deals with the TrueCrypt tool, and its possibilities of use, encrypted disk volumes analysis and cryptographic algorithms used by TrueCrypt to encrypt disk volumes. Furthermore, the work includes a concept and implementation of the Fitcrack module which will be used to recover passwords from disk volumes encrypted by TrueCrypt. At the end of the work we can see results of our experiments that compare speeds of CPU and GPU.
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