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Applicability of Deepfakes in the Field of Cyber Security
 Firc, Anton ; Homoliak, Ivan (oponent) ; Malinka, Kamil (vedoucí práce)
Deepfake technology is still on the rise, many techniques and tools for deepfake creation are being developed and publicly released. These techniques are being used for both illicit and legitimate purposes. The illicit usage yields the need for development and continuous improvement of detection tools and techniques as well as educating broad public about the dangers this technology presents. One of the unexplored areas of the illicit usage is using deepfakes to spoof voice authentication. There are mixed opinions on feasibility of deepfake powered attacks on voice biometrics systems providing the voice authentication, and minimal scientific evidence. The aim of this work is to research the current state of readiness of voice biometrics systems to face deepfakes. The executed experiments show that the voice biometrics systems are vulnerable to deepfake powered attacks. As almost all of the publicly available models and tools are tailored to synthesize the English language, one might think that using a different language might mitigate the mentioned vulnerabilities, but as shown in this work, synthesizing speech in any language is not that complicated. Finally measures to mitigate the threats  posed by deepfakes are proposed, like using text-dependent verification because it proved to be more resilient against deepfakes.
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