About Me

Dr.-Ing. André Schaller

Independent cyber security consultant combining academic depth with hands-on delivery — from the formal analysis of cryptographic protocols to penetration testing of production systems.

Portrait of Dr.-Ing. André Schaller
Dr.-Ing. / PhD CISSP ISO 27001

I help organizations understand what their systems can really withstand — with an honest, evidence-based view of actual risk, free of scaremongering or sales pressure.

My work spans security architecture reviews, cryptographic implementation, and offensive testing. I advise vendor-neutrally: my recommendations follow your risk, not a product catalog.

I work as a Security Engineer at EUMETSAT and provide my expertise in cyber security as a freelancer. Prior to that I have been working as a Cyber Security researcher at CYSEC / Technical University Darmstadt, Germany, where I graduated as a Doctor of Engineering as a member of the Security Engineering research group. Working on cutting-edge Cyber Security research projects, I gained experience in various fields including information security, engineering of secure protocols and applications, lightweight cryptography and security of embedded devices.

Focus areas

  • Security architecture & threat modeling
  • Applied cryptography & protocol analysis
  • Penetration testing & secure code review
  • Information security risk assessments (ISO 27001)
  • Incident response planning & Unix/Linux hardening
Publications

Selected publications

Peer-reviewed work on physically unclonable functions, lightweight cryptography and the security of embedded and IoT devices.

2023

Abusing Commodity DRAMs in IoT Devices to Remotely Spy on Temperature

F. Frank, W. Xiong, N. A. Anagnostopoulos, A. Schaller, T. Arul, F. Koushanfar, S. Katzenbeisser, U. Rührmair, J. Szefer

IEEE Transactions on Information Forensics and Security 18, pp. 2991–3005
2020

Software Protection Using Dynamic PUFs

W. Xiong, A. Schaller, S. Katzenbeisser, J. Szefer

IEEE Transactions on Information Forensics and Security 15, pp. 2053–2068
2019

Decay-Based DRAM PUFs in Commodity Devices

A. Schaller, W. Xiong, N. A. Anagnostopoulos, M. U. Saleem, S. Gabmeyer, B. Skoric, S. Katzenbeisser, J. Szefer

IEEE Transactions on Dependable and Secure Computing 16(3), pp. 462–475
2018

Eliminating Leakage in Reverse Fuzzy Extractors

A. Schaller, T. Stanko, B. Skoric, S. Katzenbeisser

IEEE Transactions on Information Forensics and Security 13(4), pp. 954–964
2017

Boot Attestation: Secure Remote Reporting with Off-The-Shelf IoT Sensors

S. Schulz, A. Schaller, F. Kohnhäuser, S. Katzenbeisser

ESORICS 2017, pp. 437–455
2017

Intrinsic Rowhammer PUFs: Leveraging the Rowhammer Effect for Improved Security

A. Schaller, W. Xiong, N. A. Anagnostopoulos, M. U. Saleem, S. Gabmeyer, S. Katzenbeisser, J. Szefer

IEEE International Symposium on Hardware Oriented Security and Trust (HOST) 2017, pp. 1–7
2016

Run-Time Accessible DRAM PUFs in Commodity Devices

W. Xiong, A. Schaller, N. A. Anagnostopoulos, M. U. Saleem, S. Gabmeyer, S. Katzenbeisser, J. Szefer

Cryptographic Hardware and Embedded Systems (CHES) 2016, pp. 432–453
2013

Inherent PUFs and Secure PRNGs on Commercial Off-the-Shelf Microcontrollers

A. Van Herrewege, A. Schaller, S. Katzenbeisser, I. Verbauwhede

ACM Conference on Computer and Communications Security (CCS) 2013, pp. 1333–1336

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