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Decentralized communication tool with anonymity guarantee
Legéň, Michal ; Burget, Radim (referee) ; Malý, Jan (advisor)
Anonymity on the internet is becoming a actuall issue nowadays. There are several tools, that can be used to monitor user's activity and it can lead to lose privacy of users. The aim of this master's thesis is to describe different ways of working anonymous systems, especially the method called Onion Routing. The introduction of this work is devoted to the description of this method together with asymmetric cryptosystem RSA. The second part belongs to basics of socket programming and to the implementation of anonymous system in programming language C++. The final part is focussed on analysis of system in terms of security and time complexity. The conditions of anonymity and decentralization are accomplished. There is no presence of central server in the system and the management is handled by signalling messages.
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User and Device Metadata Collection from the Darkweb
Gula, Ján ; Matoušek, Petr (referee) ; Veselý, Vladimír (advisor)
This bachelor's thesis solves the problem of anonymization on the Internet, that is widely used for dealing with illegal substances. This problem drives law enforcement agencies to be interested in web pages that represent markets with forbidden content which are hidden behind anonymity networks. My goal is to focus on the biggest markets with such content and to gather as much information as possible about subjects that posture on similar types of web pages either as sellers or as buyers. I have resolved the given problem by choosing the most impactful markets according to the number of users signed in. I have become one of the users and applied algorithms for data scraping to get information from web pages into a structured form that is more suitable for a deeper analysis. The results of this thesis will help law enforcement agencies with the analysis of metadata of users that commit illegal activities as they will not have to manually search through the illegal markets, and they will have all available data summed up in a structured form in a database. Unifying data into a structured form will help speeding up the investigation and address the biggest drug sellers.
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The analysis of TOR’s hidden service
Mesík, Vladimír ; Burda, Karel (referee) ; Rosenberg, Martin (advisor)
This work deals with problems concerning anonymity in the internet age, the principle of onion routing, Tor network, Tor’s Hidden Service protocol. Analyzing security, anonymity and the possibility of Hidden Services deanonymisation, revealing the actual IP address of hidden service server. It describes selected types of attacks against Tor network in order to deanonymisation of nodes and hidden services. The practical part describes the process of installing and configuring hidden services under Linux. The final part of the practical part is operational and running .onion hidden service with anonymous service for file storing and sharing. Part of the work is the development of two laboratory tasks aimed at the server configuration and its security.
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Anonymous communication in Internet environment
Pajtinová, Mária ; Malina, Lukáš (referee) ; Hajný, Jan (advisor)
Master´s thesis focuses on certain possibilities of how user can anonymously commununicate through the Internet. There are described following anonymous programs: TOR, JAP, I2P and CyberGhost, which allow user to hide his own identity to other IP address. Subsequently, measurements from different technologies are made by anonymous program TOR for calculate transmission speed.
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Anonymity in P2P Networks
Brunai, Adam ; Malinka, Kamil (referee) ; Barabas, Maroš (advisor)
Freedom of speech and the right to privacy are maybe the most important elements of a modern society, yet the rights are often violated. This fact was the main reason for writing this thesis covering P2P network models, anonymity, censorship resistance and their use in real P2P networks and publishing systems. We discuss their effectiveness and suitability for specific purposes, but also the security considerations of their use. The second part of this thesis presents the LSPP publishing protocol, which is an library implementation of an anonymous censorship resistant P2P network. Finally, we analyze the proposed protocol and compare it with existing solutions.
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Fingerprinting Attacks on Anonymity Systems
Krajči, Martin ; Holop, Patrik (referee) ; Malinka, Kamil (advisor)
Táto diplomová práca sa zaoberá fingerprintigovými útokmi v anonymizačných systémoch, najmä v sieti Tor. Takýto útok bol navrhnutý a vykonaný v prostredí reálneho sveta s cieľom ukázať dopad chýb, ktoré sa nachádzali v predošlých štúdiách. Tri datasety zo zatvoreného sveta a jeden dataset z otvoreného sveta boli vytvorené a použité na trénovanie a testovanie N-shot learning klasifikátora. Prvý dataset bol získaný prehliadaním webových stránok webovým prehliadačom v predvolenej konfigurácii, druhý dataset bol získaný z rovnakej konfigurácie ale z inej krajiny a tretí dataset bol získaný prehliadaním webových stránok webovým prehliadačom so zapnutým rozšírením Adblock Plus a s nastaveným španielskym lokálom. V prípade, že bol klasifikátor trénovaný aj testovaný na prvom datasete, priemerná presnosť klasifikácie dosahovala 92%. Avšak ak bol klasifikátor trénovaný na prvom datasete a testovaný na druhom a treťom datasete, priemerná presnosť klasifikácie dosahovala 38,58% a 39,65% v danom poradí.
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Anonymity in P2P Networks
Brunai, Adam ; Malinka, Kamil (referee) ; Barabas, Maroš (advisor)
Freedom of speech and the right to privacy are maybe the most important elements of a modern society, yet the rights are often violated. This fact was the main reason for writing this thesis covering P2P network models, anonymity, censorship resistance and their use in real P2P networks and publishing systems. We discuss their effectiveness and suitability for specific purposes, but also the security considerations of their use. The second part of this thesis presents the LSPP publishing protocol, which is an library implementation of an anonymous censorship resistant P2P network. Finally, we analyze the proposed protocol and compare it with existing solutions.
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User and Device Metadata Collection from the Darkweb
Gula, Ján ; Matoušek, Petr (referee) ; Veselý, Vladimír (advisor)
This bachelor's thesis solves the problem of anonymization on the Internet, that is widely used for dealing with illegal substances. This problem drives law enforcement agencies to be interested in web pages that represent markets with forbidden content which are hidden behind anonymity networks. My goal is to focus on the biggest markets with such content and to gather as much information as possible about subjects that posture on similar types of web pages either as sellers or as buyers. I have resolved the given problem by choosing the most impactful markets according to the number of users signed in. I have become one of the users and applied algorithms for data scraping to get information from web pages into a structured form that is more suitable for a deeper analysis. The results of this thesis will help law enforcement agencies with the analysis of metadata of users that commit illegal activities as they will not have to manually search through the illegal markets, and they will have all available data summed up in a structured form in a database. Unifying data into a structured form will help speeding up the investigation and address the biggest drug sellers.
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