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Peer-to-Peer VoIP Communications Using Anonymisation Overlay Networks [chapter]

Ge Zhang, Simone Fischer-Hübner
2010 Lecture Notes in Computer Science  
Nowadays, Voice over Internet Protocol (VoIP) which enables voice conversation remotely over packet switched networks gains much attentions for its low costs and flexible services. However, VoIP calling anonymity, particularly to withhold "who called whom", is difficult to achieve since VoIP infrastructures are usually deployed in an open networking environment (e.g., the Internet). Our work studies an anonymisation overlay network (AON) based solution to prevent surveillance from external
more » ... kers, who are able to wiretap the communication channels as well as to manipulate voice packets in the channels. However, it has been demonstrated that the VoIP combined with traditional AONs are vulnerable to two attacks, namely watermark attack and complementary matching attack. Taking these two attacks into account, we investigate the "defensive dropping" method in VoIP: A VoIP user-agent sends packets to an AON in a constant rate, but packets during periods of silence are marked. Then, the AON drops some silence packets and forwards the remaining ones to their destinations. The result of our experiments shows that the dropping rate must be carefully selected to counteract both of the two attacks. Finally, we discuss further threats in terms of this solution. The authors would like to thank Stefan Köpsell and Stefan Berthold for their valuable comments and suggestions.
doi:10.1007/978-3-642-13241-4_13 fatcat:olokzbmahree3f6mwe4dv5ngle

Continual Learning for Peer-to-Peer Federated Learning: A Study on Automated Brain Metastasis Identification [article]

Yixing Huang, Christoph Bert, Stefan Fischer, Manuel Schmidt, Arnd Dörfler, Andreas Maier, Rainer Fietkau, Florian Putz
2022 arXiv   pre-print
This study demonstrates the feasibility of applying continual learning for peer-to-peer federated learning in multicenter collaboration.  ...  Continual learning, as one approach to peer-to-peer federated learning, can promote multicenter collaboration on deep learning algorithm development by sharing intermediate models instead of training data  ...  This highlights the efficacy of continual learning for peer-to-peer federated learning.  ... 
arXiv:2204.13591v2 fatcat:2vbf7uhhczho5bnex47qeuruui

Updates and Transactions in Peer-to-Peer Systems [chapter]

Segev Wasserkrug, Nilesh Dalvi, Ethan V. Munson, Martin Gogolla, Cristina Sirangelo, Simone Fischer-Hübner, Zachary Ives, Yannis Velegrakis, Nigel Bevan, Christian S. Jensen, Richard T. Snodgrass
2009 Encyclopedia of Database Systems  
SYNONYMS Consistency in peer-to-peer systems; Update propagation in peer-to-peer systems DEFINITION In recent years, work on peer-to-peer systems has begun to consider settings in which data is updated  ...  (See also the entry on peer-to-peer storage.)  ...  (See also the entry on peer-to-peer storage.)  ... 
doi:10.1007/978-0-387-39940-9_1222 fatcat:lvqaizbafzgnnjosvtzsgeoldy

Digitale Netzwerkanalyse dramatischer Texte

Peer Trilcke, Frank Fischer, Dario Kampkaspar
2015 Zenodo  
A single abstract from the DHd-2015 Book of Abstracts.
doi:10.5281/zenodo.4623288 fatcat:nbht4wvvdjb73mmd65ih7i7mgy

Peer assessment as collaborative learning: A cognitive perspective

Ingo Kollar, Frank Fischer
2010 Learning and Instruction  
Peer assessment is an important component of a more participatory culture of learning.  ...  The articles collected in this special issue constitute a representative kaleidoscope of current research on peer assessment.  ...  Research on peer assessment could clearly benefit much from knowledge gathered in related fields such as peer tutoring (Graesser, Person, & Magliano, 1995) , help seeking (Aleven, Stahl, Schworm, Fischer  ... 
doi:10.1016/j.learninstruc.2009.08.005 fatcat:siozuuzavvffpcbwcs3svefxsm

Attacker Independent Stability Guarantees for Peer-2-Peer-Live-Streaming Topologies

Andreas Brieg, Michael Brinkmeier, Sascha Grau, Mathias Fischer, Guenter Schaefer
2009 2009 Second International Conference on Communication Theory, Reliability, and Quality of Service  
s v 1 v 4 v 5 v 2 v 6 v 3 v 7 v 8 Service quality of peers in low levels of the tree depends on cooperation and health of all nodes in its path to the source. More definitions...  ... 
doi:10.1109/ctrq.2009.21 fatcat:ooecqv546vesdebcifvrsbkjbq

Dramenquartett – Eine didaktische Intervention

Frank Fischer, Christopher Kittel, Carsten Milling, Peer Trilcke, Jana Wolf
2018 Zenodo  
Fischer u. a. 2016).  ...  Das Poster wird mit unserer Python-Skriptsammlung ›dramavis‹ generiert, die in der neuen Version 0.4 eine entsprechende Funktion erhalten hat (Kittel/Fischer 2017).  ... 
doi:10.5281/zenodo.4622596 fatcat:wsh6ucxhubc6vbghnhgop2abye

Digital Network Analysis of Dramatic Texts

Peer Trilcke, Frank Fischer, Dario Kampkaspar
2015 Zenodo  
The project "Digital Network Analysis of Dramatic Texts" follows in the tradition of structural analysis approaches in the literary studies and is aimed at advancing them in recourse to established methods like Social Network Analysis. The project also enhances these elder approaches through automated data acquisition and analysis in order to handle much larger corpora and to be able to generate comprehensive relational data to analyse structural transformations in the history of literature.
doi:10.5281/zenodo.3627711 fatcat:h6evrsyi7fecrkyy2xok7h3ns4

Sicherung der Prozessqualität in der pneumologischen Praxis mittels Peer-Review-Verfahren - ein Pilotprojekt

J. Fischer, D. Köhler, H. Magnussen
2006 Pneumologie  
Peer review was conducted by means of a speci− ally developed checklist of markers of process− quality accompanied by an explanatory manual.  ...  Die Peers, die Gutachter und Begutachtete gleichzeitig waren, können aufgrund der Erfah− rungen, die sie bei der Begutachtung gewonnen Abstract !  ...  Fischer sessment they received.  ... 
doi:10.1055/s-2006-932212 pmid:16933192 fatcat:7n4owgoamfdarectii73zuczku

The downside of good peers: How classroom composition differentially affects men's and women's STEM persistence

Stefanie Fischer
2017 Labour Economics  
Using administrative data, I find that women who are enrolled in a class with higher ability peers are less likely to graduate with a STEM degree, while men's STEM persistence is unaffected.  ...  Foster (2006) finds no evidence of peer effects.  ...  States Air Force Academy to squadrons, which are essentially cohorts (Carrell et al., 2009) . 3 This peer group measure is an improvement over previous studies, which define dormmates as the peer group  ... 
doi:10.1016/j.labeco.2017.02.003 fatcat:oh2lxxwsfbd53kf2rmxvoa6nou

Nonlinear optical spectroscopy of chiral molecules

Peer Fischer, François Hache
2005 Chirality  
Fischer et al. have recently observed the effect in solutions of 1,1V-bi-2-naphthol and have demonstrated that it allows nonlinear optical sum-frequency generation to be used to determine the absolute  ...  This has been confirmed by Fischer et al., who used SFG to discriminate between the nonlocal and the local response and have shown that the latter clearly dominates in 1,1V-bi-2-naphthol. 26 Nonlocal  ... 
doi:10.1002/chir.20179 pmid:16082658 fatcat:vfwvhehy7vhrbbclejxchb33ui

Aktuelle Herausforderungen der Digitalen Dramenanalyse

Marcus Willand, Peer Trilcke, Christof Schöch, Nanette Rißler-Pipka, Nils Reiter, Frank Fischer
2017 Zenodo  
Netzwerkanalyse (Frank Fischer, Peer Trilcke) Die in den quantitativen Sozialwissenschaften entwickelten Verfahren der Netzwerkforschung zielen auf eine formale Analyse sozialer Strukturen (Wasserman /  ...  Fußnoten Fischer, FrankDigitalen Dramenanalyse einen sich derzeit dynamisch entwickelnden Bereich der digitalen Literaturwissenschaften auf.  ... 
doi:10.5281/zenodo.4622643 fatcat:bhgshopetncy7l54bdbbimbtaa

Education and Health: Long-Run Effects of Peers, Tracking and Years

Martin Fischer, Ulf-G Gerdtham, Gawain Heckley, Martin Karlsson, Gustav Kjellsson, Therese Nilsson
2021 Economic Policy: A European Forum  
By differencing the effects of the parallel reforms we separate the effect of de-tracking and peers from that of more schooling.  ...  One reform only increased years of schooling, while the other increased years of schooling but also removed tracking leading to a more mixed socioeconomic peer group.  ... 
doi:10.1093/epolic/eiaa027 fatcat:2z3zqwtkgvg3jbk36c6cql3bea

Privacy for Peer Profiling in Collective Adaptive Systems [chapter]

Mark Hartswood, Marina Jirotka, Ronald Chenu-Abente, Alethia Hume, Fausto Giunchiglia, Leonardo A. Martucci, Simone Fischer-Hübner
2015 IFIP Advances in Information and Communication Technology  
The Peer Manager is a user-centered identity management platform that keeps information owned by a user private and is built upon an attribute-based privacy policy.  ...  In this paper, we introduce a privacy-enhanced Peer Manager, which is a fundamental building block for the implementation of a privacypreserving collective adaptive systems computing platform.  ...  Peer has its own PKB (Peer Knowledge Base) and PEB (Peer Entity Base) assigned and clearly separated from the other peers and the platform.  ... 
doi:10.1007/978-3-319-18621-4_16 fatcat:xrdzojttnralzbp25r6j4fer2u

A rapid and simple method for assessing and representing genome sequence relatedness

M Briand, M Bouzid, G Hunault, M Legeay, M Fischer-Le Saux, M Barret
2021 Peer Community Journal  
A previous version of this article has been peer-reviewed and recommended by Peer Community In Genomics (https://doi.org/10.24072/pci.genomics.100001).  ...  Peer Community Journal, Vol. 1 (2021), article e24 https://doi.org/10.24072/pcjournal.37  ... 
doi:10.24072/pcjournal.37 fatcat:v3qrfy7rlrga3ewxsfr5iull2a
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