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Evaluation of Little Lies in Browser Fingerprinting
Smatana, Andrej ; Hranický, Radek (referee) ; Polčák, Libor (advisor)
V ére digitálneho sveta, zachovanie súkromia uživateľa sa stáva čoraz komplexnejším procesom kvôli sofistikovaným sledovacím spôsobom ako je napríklad získavanie odtlačku prehliadača. Formou odtlačku prehliadača sa vytvorí unikátny profil užívateľa na internete, umožňujúci reidentifikáciu toho istého užívateľa. Táto práca skúma praktiky aplikovania drobných lží do odtlačkov prehliadača cez dodatočnú obfuskáciu volaní funkcií z API prehliadača. Tieto drobné lži sú vyhodnotené cez testovacie prostredie, ktorého návrhom a implementáciou sa táto téza tiež zaoberá. Moja štúdia objavuje techniky získavania odtlačkov, vyhodnocuje metódy aplikácie drobných lží a v závere prednesie návrh na zlepšenie nástroja JShelter.
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Security Risks of Mobile Device Sensors
Henclová, Kateřina ; Polčák, Libor (referee) ; Hranický, Radek (advisor)
Tato práce představuje hrozby pro mobilní bezpečnost a soukromí, které představují mobilní senzory. Představuje rozhraní Generic Sensor API, mobilní senzory a způsoby jejich zneužití. Pomocí mobilních senzorů, jako je akcelerometr, gyroskop a magnetometr, tato práce demonstruje takový útok na mobilní senzory v prohlížeči. Zvoleným útokem je rozpoznávání aktivity, které provádí predikci aktivit pomocí strojového učení se slibnými výsledky a předpovídá správnou třídu aktivit přibližně v 69% případů napříč všech tříd. Pozornost je věnována také rozšíření JShelter a tomu, zda poskytuje ochranu před nežádoucím odhalením senzorů.
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A Web Presentation of JShelter Project
Krčma, Jan ; Polčák, Libor (referee) ; Bednář, Martin (advisor)
This thesis deals with creating user-friendly web presentation of the project JShelter, in which its advantages in terms of the safety of its users when navigating the World Wide Web are highlighted, so that their anonymity and at the same time the functionality of the visited sites are sufficiently preserved. Above all, the result provided by the JShelter browser extension against tracking the user based on the deviation of his internal clock and also the confirmation of the same-origin policy protection will be shown.
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Optimizing JShelter Performance
Zmitko, Martin ; Polčák, Libor (referee) ; Hranický, Radek (advisor)
This thesis aims to lessen the impact of JShelter on the browsing experience. The goal was accomplished by measuring the performance of JShelter and analyzing the hotspots that impacted browsing performance the most. Finally, optimizations based on analysis results while leaving the high provided level of protection uncompromised were proposed and implemented. JShelter's fingerprinting protections based on image and audio data processing were optimized by extending them with a more efficient implementation using WebAssembly, which, in some cases, was faster by up to 50 times. The performance while loading web pages was increased with changes in configuration loading and injection mechanisms, on average by 13.5 %.
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Web API Blocking
Frandel, Martin ; Hranický, Radek (referee) ; Polčák, Libor (advisor)
The aim of this work is to obtain the web APIs used in the top 1 000 000 pages of the Tranco ranking along with their subpages using the Web API Manager extension, then analyze and categorize the obtained data. Design a mechanism for the JShelter extension supporting blocking of individual web APIs that have been evaluated as tracking or advertising, implement the solution and then test it. In total, 2 973 276 web pages were analyzed. The captured data was aggregated with respect to web API insecurity, analyzed and the results described in the paper, with some API calls being blocked up to 93.33 % of the time. I was able to develop a method for identifying problematic APIs. Using polynomial regression, I found polynomials that describe the blocking behavior towards individual web APIs and their methods. I implemented the blocking functionality in the JShelter extension and successfully tested the solution.
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A Web Presentation of JShelter Project
Krčma, Jan ; Polčák, Libor (referee) ; Bednář, Martin (advisor)
This thesis deals with creating user-friendly web presentation of the project JShelter, in which its advantages in terms of the safety of its users when navigating the World Wide Web are highlighted, so that their anonymity and at the same time the functionality of the visited sites are sufficiently preserved. Above all, the result provided by the JShelter browser extension against tracking the user based on the deviation of his internal clock and also the confirmation of the same-origin policy protection will be shown.
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