Emanuel von Zezschwitz

Ich bin mittlerweile leider nicht mehr an der LMU tätig, aber natürlich weiterhin unter emanuel.von.zezschwitz ät ifi.lmu.de erreichbar.

• Research Interest
• Selected Projects
  • Basic Reasearch
  • Applied Reasearch
• Scientific Services
  • Organizing Committees Member
  • Program Committee Member
  • Reviewing Activities (selection)
  • Guest Editor
• Publications
• Teaching
• Erasmus
• Bachelor, Project and Diploma Theses
  • Open Topics
  • Topics in Progress
  • Closed Topics

Research Interest

My research is based on an empirical user-centered approach involving both basic research goals and applied research projects. The basic research aims at gathering an in-depth understanding of the current state of established security mechanisms. The applied research focuses on the design and evaluation of usable security mechanisms which solve existing problems.

Selected Projects

Basic Reasearch

Survival of the Shortest: A Retrospective Analysis of Influencing Factors on Password Composition
We investigate the evolutionary change of passwords over time. For this purpose, we conducted one-on-one interviews and analyzed the complexity and the diversity of users' passwords using different analysis tools. By comparing their first-ever created passwords to several of their currently used passwords (e.g. most secure, policy-based), we were able to trace password reuse, password changes and influencing factors on the evolutionary process.

Published at INTERACT 2013

Easy to Draw, but Hard to Trace? On the Observability of Grid-based (Un)lock Patterns
We performed a systematic evaluation of the shoulder surfing susceptibility of the Android pattern (un)lock. The results of an online study (n = 298) enabled us to quantify the influence of pattern length, line visibility, and complexity. The results show that all parameters have a highly significant influence, with line visibility and pattern length being most important.

Published at CHI 2015

Patterns in the Wild: A Field Study of the Usability of Pattern and PIN-based Authentication on Smartphones
We compared the performance of Android-like unlock gestures in comparison with standard PIN, both on smartphones, under realistic conditions. The results indicate that PIN outperforms the pattern lock when comparing input speed and error rates. However, the qualitative results suggest that users tend to accept this and are still in favour of the pattern lock to a certain extent. For instance, it was rated better in terms of ease-of-use, feedback and likeability.

Published at MobileHCI 2013

Applied Reasearch

Making Graphic-Based Authentication Secure against Smudge Attacks
By using touchscreens, oily residues of the users' fingers, smudge, remain on the device's display. As this smudge can be used to deduce formerly entered data, authentication tokens are jeopardized. Based on a thorough development process using low fidelity and high fidelity prototyping, we designed several graphic-based authentication methods in a way to leave smudge traces, which are not easy to interpret.

Published at IUI 2013

SwiPIN - Fast and Secure PIN-Entry on Smartphones
We present SwiPIN, a novel authentication system that allows input of traditional PINs using simple touch gestures like up or down and makes it secure against human observers. We present two user studies which evaluated different designs of SwiPIN and compared it against traditional PIN. SwiPIN is easy to use, significantly more secure against shoulder surfing attacks and switching between PIN and SwiPIN feels natural.

Published at CHI 2015

You Can't Watch This! Privacy-Respectful Photo Browsing on Smartphones
We present an approach to protect photos on smartphones from unwanted observations by distorting them in a way that makes it hard or impossible to recognize their content for an onlooker who does not know the photographs. On the other hand, due to the chosen way of distortion, the device owners who know the original images have no problems recognizing photos.

Published at CHI 2016

Scientific Services

Organizing Committees Member

• Workshop on Inconspicuous Interaction at CHI 2014

Program Committee Member

• USEC'17 - Usable Security Mini Conference
• EuroS&P'17 - IEEE European Symposium on Security and Privacy
• CHI'17 - ACM Conference on Human Factors in Computing Systems
• SOUPS'16 - Symposium On Usable Privacy and Security
• MUM'16 - International Conference on Mobile and Ubiquitous Multimedia
• MUC'15 - Mensch und Computer

Reviewing Activities (selection)

• 2016
  • CCS - ACM Conference on Computer and Communications Security
  • CHI - ACM Conference on Human Factors in Computing Systems (PC Member)
  • IEEE Security & Privacy (IEEE Journal)
  • IUI - International Conference on Intelligent User Interfaces
  • MobileHCI - International Conference on Human-Computer Interaction with Mobile Devices and Services
  • MUM - International Conference on Mobile and Ubiquitous Multimedia (PC Member)
  • SOUPS - Symposium On Usable Privacy and Security (PC Member)
  • UbiComp - International Joint Conference on Pervasive and Ubiquitous Computing
  • UIST - ACM Symposium on User Interface Software and Technology
• 2015
  • BritishHCI - British Human Computer Interaction Conference
  • CHI - ACM Conference on Human Factors in Computing Systems
  • MobileHCI - International Conference on Human-Computer Interaction with Mobile Devices and Services
  • UbiComp - International Joint Conference on Pervasive and Ubiquitous Computing
• 2014
  • CHI - ACM Conference on Human Factors in Computing Systems
  • IUI - International Conference on Intelligent User Interfaces
  • IWC - Interacting with Computers (Oxford Journals)
  • MobileHCI - International Conference on Human-Computer Interaction with Mobile Devices and Services
  • NordiCHI - Nordic Conference on Human-Computer Interaction
  • SOUPS - Symposium On Usable Privacy and Security
  • USEC - NDSS Workshop on Usable Security
• 2013
• • CHI - ACM Conference on Human Factors in Computing Systems
  • MobileHCI - International Conference on Human-Computer Interaction with Mobile Devices and Services
  • MUM - International Conference on Mobile and Ubiquitous Multimedia
• 2012
• • DIS - Designing Interactive Systems
  • IEEE Pervasive Computing (IEEE Journal)
  • INSS - International Conference on Networked Sensing Systems

Guest Editor

• it - Information Technology. ISSN (Online) 2196-7032, ISSN (Print) 1611-2776, DOI: 10.1515/itit-2016-0010, July 2016

Publications

Find me on Google Scholar

2019
Download	Sarah Prange, Emanuel von Zezschwitz, Florian Alt Vision: Exploring Challenges and Opportunities for Usable Authentication in the Smart Home In EuroUSEC '19: Proceedings of the 4th European Workshop on Usable Security (bib)
Download	Sarah Prange, Christian Tiefenau, Emanuel von Zezschwitz, Florian Alt Towards Understanding User Interaction in Future Smart Homes In CHI '19 Workshop: New Directions for the IoT: Automate, Share, Build, and Care (bib)
2018
Download	Mohamed Khamis, Ludwig Trotter, Ville Mäkelä, Emanuel von Zezschwitz, Jens Le, Andreas Bulling, Florian Alt CueAuth: Comparing Touch, Mid-Air Gestures, and Gaze for Cue-based Authentication on Situated Displays In Proc. ACM Interact. Mob. Wearable Ubiquitous Technol. 2, 4, Article 174 (December 2018), 22 pages. (bib)
2017
Download	Mohamed Khamis, Mariam Hassib, Emanuel von Zezschwitz, Andreas Bulling, Florian Alt GazeTouchPIN: Protecting Sensitive Data on Mobile Devices using Secure Multimodal Authentication In ICMI'17: Proceedings of the 19th ACM International Conference on Multimodal Interaction, Glasgow, Scotland, Noevember 13-17, 2017. ACM, New York, NY, USA. (bib)
Download	Malin Eiband, Mohamed Khamis, Emanuel von Zezschwitz, Heinrich Hussmann, Florian Alt Understanding Shoulder Surfing in the Wild: Stories from Users and Observers In CHI '17: Proceedings of the SIGCHI Conference on Human Factors in Computing Systems. Denver, CO, USA, May 6 - 11, 2017. ACM, New York, NY, USA. (bib)
Download	Ceenu George, Mohamed Khamis, Emanuel von Zezschwitz, Marinus Burger, Henri Schmidt, Florian Alt, Heinrich Hussmann Seamless and Secure VR: Adapting and Evaluating Established Authentication Systems for Virtual Reality Proceedings of the Network and Distributed System Security Symposium (NDSS 2017) (bib)
2016
	Emanuel von Zezschwitz, Malin Eiband, Daniel Buschek, Sascha Oberhuber, Alexander De Luca, Florian Alt, Heinrich Hussmann On Quantifying the Effective Password Space of Grid-based Unlock Gestures In MUM '16: Proceedings of the 15th International Conference on Mobile and Ubiquitous Multimedia, Rovaniemi, Finnland (bib)
Download	Tobias Seitz, Emanuel von Zezschwitz, Stefanie Meitner, Heinrich Hussmann Influencing Self-Selected Passwords Through Suggestions and the Decoy Effect In Proceedings of the 1st European Workshop on Usable Security (EuroUSEC'16). Darmstadt. Internet Society (bib)
Download	Emanuel von Zezschwitz, Sigrid Ebbinghaus, Heinrich Hussmann, Alexander De Luca You Can't Watch This! Privacy-Respectful Photo Browsing on Smartphones In CHI '16: Proceedings of the SIGCHI Conference on Human Factors in Computing Systems. San Jose, CA, USA, May 7 - 12, 2016. ACM, New York, NY, USA. (bib)
Download	Daniel Buschek, Fabian Hartmann, Emanuel von Zezschwitz, Alexander De Luca, Florian Alt SnapApp: Reducing Authentication Overhead with a Time-Constrained Fast Unlock Option In CHI '16: Proceedings of the SIGCHI Conference on Human Factors in Computing Systems. San Jose, CA, USA, May 7 - 12, 2016. ACM, New York, NY, USA. (bib)
Download	Mohamed Khamis, Florian Alt, Mariam Hassib, Emanuel von Zezschwitz, Regina Hasholzner, Andreas Bulling GazeTouchPass: Multimodal Authentication Using Gaze and Touch on Mobile Devices In CHI '16 EA: Extended Abstracts of the 34th SIGCHI Conference on Human Factors in Computing Systems. San Jose, CA, USA, May 7 - 12, 2016. ACM, New York, NY, USA. (bib)
Download	Malin Eiband, Emanuel von Zezschwitz, Daniel Buschek, Heinrich Hussmann My Scrawl Hides It All: Protecting Text Messages Against Shoulder Surfing With Handwritten Fonts In CHI '16 EA: Extended Abstracts of the 34th SIGCHI Conference on Human Factors in Computing Systems. San Jose, CA, USA, May 7 - 12, 2016. ACM, New York, NY, USA. (bib)
2015
Download	Sigrid Ebbinghaus, Emanuel von Zezschwitz, Alexander De Luca, Heinrich Hussmann Privacy-Respectful Photo Browsing for Smartphones: Filter Selection and Evaluation Media Informatics Technical Report, 2015 (bib)
Download	Emanuel von Zezschwitz, Daniel Buschek, Axel Hoesl, Henri Palleis, Hanna Schneider, Tobias Stockinger, Simon Stusak, Sarah Tausch, Andreas Butz, Heinrich Hussmann Human Computer Interaction in the Internet of Things Era Media Informatics Advanced Seminar, Summer Term 2015 (bib)
	Daniel Buschek, Moritz Bader, Emanuel von Zezschwitz, Alexander De Luca Automatic Privacy Classification of Personal Photos In INTERACT '15: Proceedings of the 15th IFIP TC.13 International Conference on Human-Computer Interaction. Bamberg, Germany, September 14-18, 2015. (bib)
Download	Alina Hang, Alexander De Luca, Emanuel von Zezschwitz, Manuel Demmler, Heinrich Hussmann Locked Your Phone? Buy A New One? From Tales of Fallback Authentication on Smartphones to Actual Concepts In Proceedings of the 17th International Conference on Human-Computer Interaction with Mobile Devices and Services (MobileHCI'15). Copenhagen, Denmark, August 24th - 27th, 2015. ACM, New York, NY, USA. (bib)
Download	Emanuel von Zezschwitz, Alexander De Luca, Philipp Janssen, Heinrich Hussmann Easy to Draw, but Hard to Trace? On the Observability of Grid-based (Un)lock Patterns In Proceedings of the 33rd Annual ACM Conference on Human Factors in Computing Systems (CHI'15). Seoul, Republic of Korea, April 18 - April 23, 2015. ACM, New York, NY, USA. (bib)
Download	Emanuel von Zezschwitz, Alexander De Luca, Bruno Brunkow, Heinrich Hussmann SwiPIN - Fast and Secure PIN-Entry on Smartphones In Proceedings of the 33rd Annual ACM Conference on Human Factors in Computing Systems (CHI'15). Seoul, Republic of Korea, April 18 - April 23, 2015. ACM, New York, NY, USA. (bib)
Download	Alexander De Luca, Alina Hang, Emanuel von Zezschwitz, Heinrich Hussmann I Feel Like I'm Taking Selfies All Day! Towards Understanding Biometric Authentication on Smartphones In Proceedings of the 33rd SIGCHI Conference on Human Factors in Computing Systems (CHI '15). Seoul, Korea, April 18 - April 23, 2015. ACM, New York, NY, USA.
2014
Download	Emanuel von Zezschwitz, Alexander De Luca, Heinrich Hussmann Honey, I Shrunk the Keys: Influences of Mobile Devices on Password Composition and Authentication Performance In Proceedings of the 8th Nordic Conference on Human-Computer Interaction: Fun, Fast, Foundational (NordiCHI '14). ACM, New York, NY, USA. (bib)
Download	Alina Hang, Daniel Buschek, Alexander De Luca, Axel Hoesl, Sebastian Loehmann, Henri Palleis, Simon Stusak, Sarah Tausch, Emanuel von Zezschwitz, Andreas Butz, Heinrich Hussmann Special Aspects of Usability Media Informatics Advanced Seminar, Summer Term 2014 (bib)
Download	Marian Harbach, Emanuel von Zezschwitz, Andreas Fichtner, Alexander De Luca, Matthew Smith It's a Hard Lock Life: A Field Study of Smartphone (Un)Locking Behavior and Risk Perception In Proceedings of the Tenth Symposium on Usable Privacy and Security (SOUPS '14). July 9-11 2014. USENIX Association, Menlo Park, USA. (bib)
Download	Alexander De Luca, Marian Harbach, Emanuel von Zezschwitz, Max Maurer, Bernhard Slawik, Heinrich Hussmann, Matthew Smith Now You See Me, Now You Don't - Protecting Smartphone Authentication from Shoulder Surfers In Proceedings of the 32nd SIGCHI Conference on Human Factors in Computing Systems (CHI '14). Toronto, Canada, April 26 - May 1, 2014. ACM, New York, NY, USA. (bib)
Download	Emanuel von Zezschwitz, Alina Hang, Doris Hausen, Renate Häuslschmid, Axel Hoesl, Felix Lauber, Sebastian Loehmann, Henri Palleis, Bernhard Slawik, Simon Stusak, Sarah Tausch, Andreas Butz, Heinrich Hussmann Secondary Tasks Media Informatics Advanced Seminar, Winter Term 2013/2014 (bib)
	Alina Hang, Emanuel von Zezschwitz, Alexander De Luca, Heinrich Hussmann FaceProfiles: Inconspicuous, Private and Secure Mobile Device Sharing Workshop on Inconspicuous Interaction at CHI 2014. Toronto, Canada, April 26- May 1 2014.
2013
Download	Emanuel von Zezschwitz, Alexander De Luca, Heinrich Hussmann Survival of the Shortest: A Retrospective Analysis of Influencing Factors on Password Composition In Proceedings of the 14th IFIP TC13 Conference on Human-Computer Interaction (INTERACT 2013). Cape Town, South Africa, September 2-6 2013. (bib)
Download	Max Maurer, Alexander De Luca, Alina Hang, Doris Hausen, Fabian Hennecke, Sebastian Loehmann, Henri Palleis, Hendrik Richter, Simon Stusak, Aurélien Tabard, Sarah Tausch, Emanuel von Zezschwitz, Franziska Schwamb, Heinrich Hussmann, Andreas Butz Long-Term Experiences with an Iterative Design of a QR-Code-Based Payment System for Beverages In Proceedings of the 14th IFIP TC13 Conference on Human-Computer Interaction (INTERACT 2013). Cape Town, South Africa, September 2-6 2013.
Download	Alina Hang, Alexander De Luca, Katharina Frison, Emanuel von Zezschwitz, Massimo Tedesco, Marcel Kockmann, Heinrich Hussmann Travel Routes or Geography Facts? An Evaluation of Voice Authentication User Interfaces In Proceedings of the 14th IFIP TC13 Conference on Human-Computer Interaction (INTERACT 2013). Cape Town, South Africa, September 2-6 2013. (bib)
Download	Emanuel von Zezschwitz, Paul Dunphy, Alexander De Luca Patterns in the Wild: A Field Study of the Usability of Pattern and PIN-based Authentication on Smartphones In MobileHCI '13: Proceedings of the 15th international conference on Human-computer interaction with mobile devices and services. ACM, New York, NY, USA, 261-270. ISBN 978-1-4503-2273-7. (bib)
Download	Doris Hausen, Fabian Hennecke, Nora Broy, Alina Hang, Sebastian Loehmann, Max Maurer, Sonja Rümelin, Sarah Tausch, Emanuel von Zezschwitz, Andreas Butz, Heinrich Hussmann Visualize! Media Informatics Advanced Seminar, Summer Term 2013 (bib)
Download	Alexander De Luca, Emanuel von Zezschwitz, Ngo Dieu Huong Nguyen, Max Maurer, Elisa Rubegni, Marcello Paolo Scipioni, Marc Langheinrich Back-of-Device Authentication on Smartphones In CHI '13: Proceedings of the 31st SIGCHI Conference on Human Factors in Computing Systems. Paris, France, April 27 - May 2, 2013. ACM, New York, NY, USA, 2389-2398. ISBN 978-1-4503-1899-0. (Best Paper Honorable Mention Award) (bib)
Download	Alexander De Luca, Emanuel von Zezschwitz, Laurent Pichler, Heinrich Hussmann Using Fake Cursors to Secure On-Screen Password Entry In CHI '13: Proceedings of the 31st SIGCHI Conference on Human Factors in Computing Systems. Paris, France, April 27 - May 2, 2013. ACM, New York, NY, USA, 2399-2402. ISBN 978-1-4503-1899-0. (Best Paper Honorable Mention Award) (bib)
Download	Henri Palleis, Alina Hang, Doris Hausen, Fabian Hennecke, Felix Lauber, Sonja Rümelin, Simon Stusak, Sarah Tausch, Emanuel von Zezschwitz, Andreas Butz, Heinrich Hussmann Beyond the Desktop Media Informatics Advanced Seminar, Winter Term 2012/2013 (bib)
Download	Emanuel von Zezschwitz, Anton Koslow, Alexander De Luca, Heinrich Hussmann Making Graphic-Based Authentication Secure against Smudge Attacks In IUI '13: Proceedings of the 2013 international conference on Intelligent user interfaces. ACM, New York, NY, USA, 277-286. DOI=10.1145/2449396.2449432, ISBN: 978-1-4503-1965-2. (bib)
2012
Download	Alina Hang, Emanuel von Zezschwitz, Alexander De Luca, Heinrich Hussmann Too much Information! User Attitudes towards Smartphone Sharing In NordiCHI '12: Proceedings of the 7th Nordic Conference on Human-Computer Interaction: Making Sense Through Design. ACM, New York, NY, USA, 284-287. DOI=10.1145/2399016.2399061, ISBN: 978-1-4503-1482-4. (bib)
Download	Alina Hang, Fabian Hennecke, Sebastian Loehmann, Max Maurer, Henri Palleis, Sonja Rümelin, Emanuel von Zezschwitz, Andreas Butz, Heinrich Hussmann User Behavior Media Informatics Advanced Seminar, Summer Term 2012 (bib)
Download	Emanuel von Zezschwitz, Alina Hang Towards Privacy-Aware Mobile Device Sharing 4th International Workshop on Security and Privacy in Spontaneous Interaction and Mobile Phone Use (in Conjunction with Pervasive 2012), Newcastle, United Kingdom, June 2012 (bib)
2010
Download	Emanuel von Zezschwitz An Evaluation of the Influence of External Factors on Authentication Performance and Memorability Diploma Thesis, Ludwig-Maximilians-Universität München, 2010 (bib)
2009
Download	Alexander De Luca, Emanuel von Zezschwitz, Heinrich Hussmann VibraPass - Secure Authentication Based on Shared Lies In CHI '09: Proceedings of the 27th international Conference on Human Factors in Computing Systems. Boston, MA, USA, April 4 - 9, 2009. ACM, New York, NY, 913-916. DOI= http://doi.acm.org/10.1145/1518701.1518840, ISBN 978-1-60558-246-7. (bib)

Teaching

• Winter 2016
  • Human-Computer Interaction 2
• Summer 2016
  • Multimedia-Programmierung
  • Fortgeschrittene Themen zu HCI (Guest Lecture)
• Winter 2015
  • Informationsvisualisierung
• Summer 2015
  • Hauptseminar
  • Fortgeschrittene Themen zu HCI (Guest Lecture)
• Winter 2014
  • Informationsvisualisierung
• Summer 2014
  • Multimedia-Programmierung
• Winter 2013
  • Hauptseminar
• Summer 2013
  • Medientechnik
• Winter 2012
  • Informationsvisualisierung
  • Praktikum Mediengestaltung "40 Jahre S-Bahn"
• Summer 2012
  • Praktikum Entwicklung von Mediensystemen
  • Medientechnik
• Winter 2011
  • Informationsvisualisierung

Erasmus

Bachelor, Project and Diploma Theses

Open Topics

Topics in Progress

Closed Topics