by Radim O¹»ádal, Petr ©véda, Václav Matyá¹, September 2016, 20 pages.
FIMU-RS-2016-04. Available as Postscript, PDF.
Partially compromised network is a pragmatic assumption in many real-life
by Petr ©venda, Matus Nemec, Peter Sekan, Rudolf Kvasnovsky, David Formanek, David Komarek, Václav Matyá¹, August 2016, 83 pages.
FIMU-RS-2016-03. Available as Postscript, PDF.
Can bits of an RSA public key leak information about design and implementation choices such as the prime generation algorithm? We analysed over 60 million freshly generated key pairs from 22 open- and closed-source libraries and from 16 different smartcards, revealing significant leakage. The bias introduced by different choices is sufficiently large to classify a probable library or smartcard with high accuracy based only on the values of public keys. Such a classification can be used to decrease
by Jan Papou¹ek, Vít Stanislav, Radek Pelánek, April 2016, 13 pages.
FIMU-RS-2016-02. Available as Postscript, PDF.
We study the impact of question difficulty on learners’ engagement and learning using an experiment with an open online educational system for adaptive practice of geography. The experiment shows that easy questions are better for short term engagement, whereas difficult questions are better for long term engagement and learning. These results stress the necessity of careful formalization of goals and optimization criteria of open online education systems. We also present disaggregation of overall results into specific contexts of practice and highlight the issue of attrition bias. This paper is an extended version of the paper presented at Intelligent Tutoring Systems conference.
by Martin Stehlik, Václav Matyá¹, Andriy Stetsko, A full version of the paper presented at conference ICNSC 2016. April 2016, 30 pages.
FIMU-RS-2016-01. Available as Postscript, PDF.
A number of intrusion detection techniques have been proposed to detect different kinds of active attacks on wireless sensor networks (WSNs). Selective forwarding and delay attacks are two simple but effective attacks that can disrupt the communication in WSNs. In this work, we propose two parametrized collaborative intrusion detection techniques and optimize their parameters for a specific scenario using extensive simulations and multiobjective evolutionary algorithms. Moreover, we sample the whole search space to enable evaluation of evolution performance. The found optimized results are also compared to a simpler non-collaborative detection technique to demonstrate improvements of collaborative approach. We also evaluate the influence of changes of the number of malicious nodes on the intrusion detection performance. This technical report extends our paper presented at conference ICNSC 2016 by details of experiment settings and results.