Category Archives: BSc Theses

BSc thesis: Secure Data Transmission over Mobile Voice Channel


Student: Maksim Lind
Supervisor: Alexander Tkachenko
Reviewer: Ilya Verenich

Abstract: A number of attempts has been done to address the issue of mobile communication security. In this work, we describe an alternative solution, where security is enforced before any information reaches the phone. Sensitive information such as voice is processed in an external device and then passed into the mobile phone as an analog sound signal. The advantage of this approach is that the external unit and can be attached to any phone with a sound input. While building the system, we analyzed a number of existing solutions, tuned parameters and performed experiments.

As a result, our system established a secure data connection with transfer speeds up to 2000 bps and a medial error rate of 21 percent. Because of the high error rate, the channel we provided was not reliable enough to carry a voice signal.

The work does not deal with key management problem, but assumes that both parties have established symmetric key beforehand.
The idea itself is pretty neat and has been commercialized by JackPair kickstarter project.


BSc thesis: Denial of Service Attacks and Defense Solutions


Student: Erki Vaino
Supervisor: Meelis Roos
Reviewer: Ljubov Feklistova

Over time denial of service attacks have become more sophisticated and a popular method amongst attackers. This document will provide overview of different attacks and defense solutions against them. Although there are many great resources about the subject in English, there are very few of them in Estonian. Firstly there is a general overview of the attacks how they can be classified. Then descriptions of how different attacks work and which vulnerabilities or mechanics they use to stop the victim for providing service. In the last part there are descriptions how these attacks can be stopped or mitigated and also which products and solutions companies currently provide on the market at the moment. Each product is described briefly and info given how it helps to protect the network.

The thesis also contains interviews with two Estonian IT infrastructure architects.