Thesis Details

Ochrana firemních dat pomocí rozšíření do webového prohlížeče

Master's Thesis Student: Dvořák Jan Academic Year: 2021/2022 Supervisor: Polčák Libor, Ing., Ph.D.
English title
Web Browser Extension Providing Protection of Company Data

This thesis focuses on securing company data stored in SaaS storage. In contrast to data stored on-premise, data stored in the cloud face several additional risks, be it from the outside as well as from the inside of the organization. The main risk, whose impacts we try to mitigate in this work, is an accidental data leak by one of the organization's employees. An extension for the Google Chrome web browser was designed and implemented as a solution to this issue. Implementation complications rising from transitioning to a new version of the manifest are also examined in part of this work. The thesis is concluded with the execution of experiments simulating practical data loss scenarios and a verdict on whether a web extension is an appropriate means for creating a tool providing data loss prevention capabilities.


Data Loss Prevention, DLP,Web browser extension, Google Chrome extension, Information security

Degree Programme
defended, grade D
20 June 2022
Ryšavý Ondřej, doc. Ing., Ph.D. (DIFS FIT BUT), předseda
Grégr Matěj, Ing., Ph.D. (DIFS FIT BUT), člen
Hrubý Martin, Ing., Ph.D. (DITS FIT BUT), člen
Matoušek Petr, doc. Ing., Ph.D., M.A. (DIFS FIT BUT), člen
Meduna Alexander, prof. RNDr., CSc. (DIFS FIT BUT), člen
Veselý Vladimír, Ing., Ph.D. (DIFS FIT BUT), člen
DVOŘÁK, Jan. Ochrana firemních dat pomocí rozšíření do webového prohlížeče. Brno, 2022. Master's Thesis. Brno University of Technology, Faculty of Information Technology. 2022-06-20. Supervised by Polčák Libor. Available from:
    author = "Jan Dvo\v{r}\'{a}k",
    type = "Master's thesis",
    title = "Ochrana firemn\'{i}ch dat pomoc\'{i} roz\v{s}\'{i}\v{r}en\'{i} do webov\'{e}ho prohl\'{i}\v{z}e\v{c}e",
    school = "Brno University of Technology, Faculty of Information Technology",
    year = 2022,
    location = "Brno, CZ",
    language = "czech",
    url = ""
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