Auch wenn bei Meta die Einführung holprig erscheint und Microsoft und andere Firmen ihre Strategien auf den Prüfstand stellen: Das viel diskutierte Metaverse ist schon da – jedenfalls in einzelnen Bereichen, wie etwa bei Events, Messen und Kundenveranstaltungen. Welche Ansätze gibt es? Was ist Erfolg versprechend?

The usage of e-learning platforms, online lectures and online meetings for academic teaching increased during the Covid-19 pandemic. Lecturers created video lectures, screencasts, or audio podcasts for online learning. The Hochschul-Assistenz-System (HAnS) is a learning experience platform that uses machine learning (ML) methods to support students and lecturers in the online learning and teaching processes. HAnS is being developed in multiple iterations as an agile open-source collaborative project supported by multiple universities and partners. This paper presents the current state of the development of HAnS on German video lectures.

E-mail phishing attacks are still the number one gateway for attackers. Even when the patch level of a network is up to date, if one employee clicks on a link in a phishing e-mail and enters their credentials on a malicious website or downloads malware, the whole organization might get compromised. Anti-phishing support systems highlight different aspects of an e-mail to help users to detect phishing e-mails. However, little is known about their effectiveness, especially in comparison to each other. This paper presents our experimental design to investigate the efficacy of various support systems. For this purpose, we created a fictional scenario and an interactive tool to display e-mails. In addition, we present our preliminary study with the first results to classify test e-mails in different difficulty levels that serve as a basis for our main study.

Edge computing emerges as a trend, forming a link between the Internet of Things and cloud-based services.

Large-scale edge deployments are already in place today in the context of communication network providers

that offload more and more tasks to the edge to ensure high flexibility and low latencies. By relying on remote

attestation and disk encryption techniques, we design a novel system architecture that protects confidential

data on edge nodes in the case of device theft. Recent vulnerabilities like Ripple20 and Amnesia:33 show the

consequences and costs of critical security bugs stemming from outdated system software. Thus, we design

our system in a way that a node can derive its decryption key if and only if a trusted remote party (e.g., a

network operator) can verify that it is running the latest software. This is a security feature that prevalent

implementations like Linux’s dm-crypt lack. To secure the early-boot communication, we rely on a trusted

execution environment, hardware offloading, and Rust device drivers. We prototype our system on two recent

ARMv8 devices and show that the performance overhead (≈ 2%) and the boot delay (1s) are low. Thus, we

believe that our concept is a meaningful step towards more secure future edge devices.

Linear low-density polyethylene (LLDPE) crosslinks under irradiation in the range of up to 250 kGy. Crosslinking leads to better chemical and thermal resistance but causes reduction in mechanical performance. To counter this reduction, compounds of LLDPE with thermoplastic elastomers (TPV) were made. Specimens were irradiated with doses reaching from 99 to 231 kGy. Gel content shows a decrease of around 12% for compounds with 20 wt% of TPV compared to pure LLDPE. It is also found that compounds containing 10 wt% TPV experience a 4% higher gel content than predicted. For higher amounts of TPV elongation at break increases from 689% for pure LLDPE to 769% and tensile strength decreases from 31.9 to 30.5 MPa. Under irradiation, a trend to lower elongations and tensile strengths is observed. Elongation at break decreased around 200% and tensile strength around 5 MPa under irradiation. Thermal analysis of TPV showed that while the melting temperature decreases, its crystallinity first rises for doses up to 165 kGy before decreasing. Infrared spectroscopy was used to identify changes in the chemical structure, where evidence of surface oxidation under irradiation is found for all compounds with LLDPE.

Tor is a popular privacy-enhancing technology that allows anonymous communication using onion routing. However, such technologies are only helpful if used; therefore, performance is an important aspect. One of the main performance bottlenecks of Tor is the cross-circuit interference (CCI) problem. Tor multiplexes multiple circuits over a single Transport Layer Security (TLS) 1.2 connection if they share a path segment (link). Therefore, they have the same congestion window, which can yield unfair bandwidth allocation. However, there has been little work in understanding this problem in more depth.

This paper investigates the number of simultaneously shared links in the current Tor network, which are the root cause of CCI. We developed a novel shared links simulator called SALSA to investigate this problem. Our results show that 3.7 % of active links are shared, and the involving Onion Routers (ORs) have the most common bandwidth capabilities. Additionally, we show that the internal circuits and exit policy influence the CCI problem. Furthermore, we model the number of shared links when the demand grows further and show that the number of shared links can go up to 16 %. Finally, we run Shadow simulations with a 25 % downscaled Tor network and show that a network without shared links is faster.

Datenteilen im Bauprozess in Common Data Environments (CDE) ist bisher durch die DIN EN ISO 19650 erfasst, die keine expliziten Vorgaben zur rechtlichen Organisation der technischen Infrastruktur macht, sondern eher auf die Prozesse abhebt. Dies ändert sich mit der Verab-schiedung des europäischen Data Governance Act (DGA) am 30.05.2022, der als direkt wirkende Verordnung die gesetzliche Trennung des Anbietens von Daten und Services vorsieht. Be-stehende Geschäftsmodelle zum Datenteilen in der Baubran-che sind auf ihre Rechtskonformität zu überprüfen und ggf. an-zupassen. Der Beitrag will zeigen, wie das Datenteilen nach Erlass des DGA in einem CDE im Bauprozess rechtskonform möglich sein kann und nimmt dabei insbesondere auf das Tei-len von Daten im Rahmen der BIM-basierten Planung Bezug