Publications

2024

• T. Heijligenberg, D. Rupprecht, and K. Kohls
  The attacks aren’t alright: Large-Scale Simulation of Fake Base Station Attacks and Detections
  Cyber Security Experimentation and Test Workshop (CSET'24)
  

2023

• B. Karakoc, N. Fürste, D. Rupprecht, and K. Kohls
  Never Let Me Down Again: Bidding-Down Attacks and Mitigations in 5G and 4G
  Security and Privacy in Wireless and Mobile Networks (WiSec'23)
  PDF
  

• T. Heijligenberg, G. Knips, C. Böhm, D. Rupprecht, and K. Kohls
  BigMac: Performance Overhead of User Plane Integrity Protection in 5G Networks
  Security and Privacy in Wireless and Mobile Networks (WiSec'23)
  PDF
  

• T. Schnitzler, K. Kohls, E. Bitsikas, and C. Pöpper
  Hope of Delivery: Extracting User Locations From Mobile Instant Messengers
  Network and Distributed System Security Symposium (NDSS'23)
  PDF
  

2022

• T. Heijligenberg, O. Lkhaouni, K. Kohls
  Leaky Blinders: Information Leakage in Mobile VPNs
  International Workshop on Security in Mobile Technologies (SecMT'22)
  PDF
  
• V. Rimmer, T. Schnitzler, T. Van Goethem, A. R. Romero, W. Joosen, and K. Kohls
  Trace Oddity: Methodologies for Data-Driven Traffic Analysis on Tor
  Privacy Enhancing Technologies Symposium (PETS'22)
  PDF
  
• K. Kohls and C. Diaz
  VerLoc: Verifiable Localization in Decentralized Systems
  USENIX Security Symposium (USENIX'22)
  ArXiv, PDF
  

2021

• T. Stadler, W. Lueks, K. Kohls, and C. Troncoso
  Preliminary Analysis of Potential Harms in the Luca Tracing System
  March 23 2021
  ArXiv
  
• T. Schnitzler, C. Pöpper, M. Dürmuth, and K. Kohls
  We Built This Circuit: Exploring Threat Vectors in Circuit Establishment in Tor
  European Symposium on Security and Privacy (Euro S&P'21)
  PDF, Presentation, Slides

2020

• R. S. Raman, P. Shenoy, K. Kohls, and R. Ensafi
  Censored Planet: An Internet-wide, Longitudinal Censorship Observatory
  Conference on Computer and Communications Security (CCS'20)
  
• D. Rupprecht, K. Kohls, T. Holz, and C. Pöpper
  Call Me Maybe: Eavesdropping Encrypted LTE Calls With ReVoLTE
  USENIX Security Symposium (USENIX’20)
  Website, PDF
• D. Rupprecht, K. Kohls, T. Holz, and C. Pöpper
  IMP4GT: IMPersonation Attacks in 4G NeTworks
  Network and Distributed System Security Symposium (NDSS’20)
  Website, PDF

2019

• D. Rupprecht, K. Kohls, T. Holz, and C. Pöpper
  Breaking LTE on Layer Two
  Symposium on Security and Privacy (SP’19)
  Website, PDF
• K. Kohls and C. Pöpper
  Poster: Application-Layer Routing Attacks on Tor
  Symposium on Security and Privacy (SP’19)
  Poster
• K. Kohls, D. Rupprecht, T. Holz, and C. Pöpper
  Lost Traffic Encryption: Fingerprinting LTE Traffic on Layer Two
  Security and Privacy in Wireless and Mobile Networks (WiSec’19)
  PDF
• K. Kohls, K. Jansen, D. Rupprecht, T. Holz, and C. Pöpper
  On the Challenges of Geographical Avoidance for Tor
  Network and Distributed System Security Symposium (NDSS’19)
  PDF, Presentation, Slides
• L. Schönherr, K. Kohls, S. Zeiler, T. Holz, and D. Kolossa
  Adversarial Attacks Against Automatic Speech Recognition Systems via Psychoacoustic Hiding
  Network ad Distributed System Security Symposium (NDSS’19)
  Website, PDF

2018

• K. Kohls and C. Pöpper
  DigesTor: Comparing Passive Traffic Analysis Attacks on Tor
  European Symposium on Research in Computer Security (ESORICS’18)
  PDF, Slides

2017

• K. Kohls and C. Pöpper
  Poster: Traffic Analysis Attacks in Anonymity Networks
  Asia Conference on Computer and Communications Security (ASIACCS’17)
  Proposal

2016

• K. Kohls, T. Holz, D. Kolossa, and C. Pöpper
  Skypeline: Robust Hidden Data Transmission for VoIP
  Asia Conference on Computer and Communications Security (ASIACCS’16)
  PDF, Technical Report
• A. Zarras, K. Kohls, M. Dürmuth, and C. Pöpper
  Neuralyzer: Flexible Expiration Times for the Revocation of Online Data
  Conference on Data and Application Security and Privacy (CODASPY’16)
  Outstanding Paper Award
  PDF

Before PhD

• P. Bök, K. Kohls, D. Behnke, and C. Wietfeld
  Distributed Flow Permission Inspection for Mission-Critical Communication of Untrusted Autonomous Vehicles
  Vehicular Technology Conference (VTC’14)
• P. Bök, K. Kohls, S. Dünhapt, and Y. Tüchelmann
  Improving the Distributed Fair Congestion Avoidance Protocol for Home Area Networks with Internet Access Links
  International Conference on Computer Communications and Networks (ICCCN’12)
• P. Bök, K. Kohls, Y. Tüchelmann, and K. Kollorz
  I-DWRR — An Insolvency Enabled Scheduling Scheme Extending Deficit Weighted Round Robin
  GLOBECOM Workshops (GC Wkshps’11)