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.

The aim of this thesis is a distributed solution for password recovery, using hashcat tool. The basis of this solution is password recovery tool Fitcrack, developed during my previous work on TARZAN project. The jobs distribution is done using BOINC platform, which is widely used for volunteer computing in a variety of scientific projects. The outcome of this work is a tool, which uses robust and reliable way of job distribution across a local or the Internet network. On the client side, fast and efficient password recovery process takes place, using OpenCL standard for acceleration of the whole process with the use of GPGPU principle.

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.

The goal of this thesis is to design and implement a framework allowing password recovery in a distributed environment. The research is therefore focused on analyzing the security of passwords, techniques used for attacks on them and also presents methods preventing attacks on passwords. Described is the Wrathion tool which is allowing password recovery using acceleration on graphic cards through the integration of OpenCL framework. Conducted is also an analysis of available environments providing means to run computing tasks on multiple devices, based on which the OpenMPI platform is chosen for extending Wrathion. Disclosed are various modifications and added components, and the entire system is also subjected to experiments aiming at the measuring of scalability and network traffic performance. The financial side of the use of Wrathion tool is also discussed in terms of its usability in cloud based distributed environment.

Careless Society: Drivers of (Un)Secure Passwords Thesis abstract Vojtěch Nedvěd May 2, 2021 Vulnerabilities related to poor cybersecurity are a dangerous global economic issue. This thesis aims to explain two examples of poor password management. First, why users use similar password and username and second, why they reuse their passwords, as the main drivers of this behaviour are unknown. We examined the effects of selected macroeconomic variables, gender, password length and password complexity. Additionally, this thesis suggest how to estimate sentiment in passwords using models build on Twitter posts. The results are verified on large password data, including password leaks from recent years. There are four main findings. First, a higher cybersecurity index and diversity of a password seem to be related to the lower similarity between a username and a password. Second, it seems that there are structural differences between countries and languages. Third, the sentiment seems to be a significant determinant too. Fourth, password reuse seems to be positively affected by the cybersecurity level. The thesis contributes to the study of password management. It proposes how to model the relationship, derive the data, split the passwords into words, model the sentiment of passwords, what variables might be...

This dissertation describes information as an economic object and focuses on information security with reference to all technical and social aspects and documents the necessity to consider both those areas simultaneously. The dissertation determines information security standards and describes some tools being used for effective data protection and information systems protection. One part of this dissertation is a model design for effective controlling of data and process protection, which can be used by bank managers on process control design especially in transaction processing area. This model is divided into several logical and consequential blocks and provides help to operating managers to design or redesign new or existing processes accordingly. The dissertation clearly highlights related insufficiencies especially those related to data access protection and passwords and one related survey has been performed to prove that