Next Seminar on 13.04.2022

Written on 08.04.2022 13:12 by Stella Wohnig

Dear All,

Update 2022-04-09: Added Priyasha Chatterjee's talk information, which was missing due to technical difficulties. Sorry!

The next seminar(s) take place on 13.04. at 14:00.

Session A: (RA3,4)
Joshua Steffensky - Priyasha Chatterjee - Tom Baumeister

Meeting-ID: 967 8620 5841
Kenncode: BT!u5=


Session A:


Speaker: Joshua Steffensky
Type of talk: Master Intro
Advisor: Dr. Sven Bugiel
Title: FIDO2 inside - Unifying digital and physical authentication
Research Area: 4

The FIDO2 authentication scheme was released by the FIDO Alliance[1] in 2019 as the successor
of their Universal 2nd Factor (U2F) scheme. FIDO2 improves on U2F by providing a usable, secure and open
authentication scheme for both hardware backed two-factor authentication, as well as complete passwordless
authentication. While FIDO2 was, as the name ”Fast IDentity Online” suggests, designed for web authentic-
ation, its use of an asymmetric challenge-response scheme and the specification of an interface for movable
cryptographic security devices makes it amenable to being used in other authentication contexts. This thesis
aims to investigate the possibility of using FIDO2 authentication in the physical authentication context.



Speaker: Priyasha Chatterjee
Type of talk: Master Final
Advisor: Dr. Katharina Krombholz
Title: User-centric Privacy Design for Smart Speakers
Research Area: RA5

Abstract: As ubiquitous computing becomes more widespread, so does the market for voice-controlled smart devices which afford convenience like never before. Smart home systems allow smart devices to connect to a hub, such as Amazon's Alexa, or Google Nest, which are smart speakers allowing users to control them by voice. However, while users find that these systems offer great convenience, they also find that they need to settle on a trade-off between privacy and security, and convenience. There have been reports of many privacy incidents in recent years, and in 2019, 41% of all smart home users were found to have been apprehensive about privacy around their smart speakers.
While there already exist a few designs for privacy protecting solutions, to the best of my knowledge, none of these have taken a user-centric approach to the design problem. My thesis thus proposes to identify one or more effective designs for privacy enhancement solutions for smart speakers, designed with the users in mind.
This is achieved by conducting a brief mixed-methods study with smart speaker users. The study comprises a questionnaire, a semi-structured interview, and prototype evaluation, allowing for the collection of detailed and meaningful insights into users’ perceptions, requirements and preferences. Through this study, I observe patterns in user intentions and behaviours around their smart speakers, and elicit design preferences. Finally, I establish user-centric designs and present recommendations for the design and development of future privacy enhancement solutions.



Speaker: Tom Baumeister
Type of talk: Master Intro
Advisor: PD Dr.Swen Jacobs
Title: Parameterized Repair of Disjunctive Systems for Liveness Properties
Research Area: RA2 (Reliable Security Guarantees)

Abstract: Concurrent systems that are composed of an arbitrary number n of processes, are hard to get correct. For these systems, parameterized model checking can provide correctness guarantees that hold regardless of n. However, model checking gives the designer no information about a possible repair when detecting an incorrect behaviour. The parameterized repair problem is, for a given implementation, to find a deadlock-free refinement such that a given property is satisfied by the resulting parameterized system. We present a repair algorithm that uses a parameterized model checker to determine correctness of generated candidate repairs. By updating a constraint system, when detecting a violation, the algorithm returns a repair iff one exists. For general safety properties, this algorithm can be applied on classes of systems which can be represented as well-structured transition systems (WSTS), including disjunctive systems, pairwise rendezvous systems and broadcast protocols. However, the existing approach cannot guarantee correctness for liveness properties, like termination or the absence of undesired loops. Since verifying liveness properties for parameterized systems quickly leads to undecidability, we want to study the parameterized repair problem for disjunctive systems and general liveness properties.


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