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Access Controll for USB Bus
Krajči, Martin ; Malinka, Kamil (referee) ; Očenáš, Martin (advisor)
This bachelor thesis addresses the matter of controlling USB devices in operating system Linux. The main objective consists of making an application, which analyzes USB devices based on their attributes and decides, whether they should be allowed or blocked, while it is necessary to finish the inspection before a device is given a chance to perform potentially harmful activities. The thesis also discuses the need of blocking certain devices in terms of security. The final application was implemented as two independent modules. The first module represents an interface for defining specific rules to be used in order to determine the harmlessness of the device. Second module uses created rules to control USB devices discovered by kernel messages designed for subsystem UDEV. Based on the result of the control, the application decides whether the device should be authorized or unauthorized and informs the user about the performed action via terminal.
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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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Access Controll for USB Bus
Krajči, Martin ; Malinka, Kamil (referee) ; Očenáš, Martin (advisor)
This bachelor thesis addresses the matter of controlling USB devices in operating system Linux. The main objective consists of making an application, which analyzes USB devices based on their attributes and decides, whether they should be allowed or blocked, while it is necessary to finish the inspection before a device is given a chance to perform potentially harmful activities. The thesis also discuses the need of blocking certain devices in terms of security. The final application was implemented as two independent modules. The first module represents an interface for defining specific rules to be used in order to determine the harmlessness of the device. Second module uses created rules to control USB devices discovered by kernel messages designed for subsystem UDEV. Based on the result of the control, the application decides whether the device should be authorized or unauthorized and informs the user about the performed action via terminal.
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