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Christoph Dobraunig
Biography
Currently, I am working for Intel. Before that, I worked for Lamarr Security Research, the Radboud University in Nijmegen, and the Graz University of Technology. So far, I have done research in cryptography (analysis and design of symmetric cryptography) and implementation security (side-channel and fault attacks). However, my interests are not limited to these topics. I am a co-designer of the winner of the NIST lightweight cryptography standardization process and the first choice for lightweight applications in CAESAR, Ascon. Furthermore, I am a co-designer of Elephant and ISAP, two finalists of the NIST lightweight cryptography standardization process. Moreover, I am part of the SPHINCS+ Team. Currently, I have the honor of serving as Co-Editor-in-Chief for the IACR Transactions on Symmetric Cryptology (ToSC).
Interests
- Cryptography
- Information Security
- Implementation Security
Education
-
Doctoral Programme in Computer Sciences, 2014–2017
Graz University of Technology
-
Master's Programme in Telematics (Information and Computer Engineering), 2011–2014
Graz University of Technology
-
Bachelor's Programme in Telematics (Information and Computer Engineering), 2007–2011
Graz University of Technology
Journal Articles
Christoph Dobraunig, Bart Mennink, Samuel Neves
.
EliMAC: Speeding Up LightMAC by around 20%.
In IACR Transactions on Symmetric Cryptology,
2023.
Christoph Dobraunig, Lorenzo Grassi, Lukas Helminger, Christian Rechberger, Markus Schofnegger, Roman Walch
.
Pasta: A Case for Hybrid Homomorphic Encryption.
In IACR Transactions on Cryptographic Hardware and Embedded Systems,
2023.
Yanis Belkheyar, Joan Daemen, Christoph Dobraunig, Santosh Ghosh, Shahram Rasoolzadeh
.
BipBip: A Low-Latency Tweakable Block Cipher with Small Dimensions.
In IACR Transactions on Cryptographic Hardware and Embedded Systems,
2023.
Christoph Dobraunig, Maria Eichlseder, Florian Mendel, Martin Schläffer
.
Ascon v1.2: Lightweight Authenticated Encryption and Hashing.
Journal of Cryptology,
2021.
Christoph Dobraunig, Bart Mennink
.
Tightness of the Suffix Keyed Sponge Bound.
In IACR Transactions on Symmetric Cryptology,
2020.
Joan Daemen, Christoph Dobraunig, Maria Eichlseder, Hannes Gross, Florian Mendel, Robert Primas
.
Protecting against Statistical Ineffective Fault Attacks.
In IACR Transactions on Cryptographic Hardware and Embedded Systems,
2020.
Christoph Dobraunig, Yann Rotella, Jan Schoone
.
Algebraic and Higher-Order Differential Cryptanalysis of Pyjamask-96.
In IACR Transactions on Symmetric Cryptology,
2020.
Christoph Dobraunig, Maria Eichlseder, Stefan Mangard, Florian Mendel, Bart Mennink, Robert Primas, Thomas Unterluggauer
.
ISAP v2.0.
In IACR Transactions on Symmetric Cryptology Special Issue,
2020.
Tim Beyne, Yu Long Chen, Christoph Dobraunig, Bart Mennink
.
Dumbo, Jumbo, and Delirium: Parallel Authenticated Encryption for the Lightweight Circus.
In IACR Transactions on Symmetric Cryptology Special Issue,
2020.
Christoph Dobraunig, Florian Mendel, Bart Mennink
.
Practical Forgeries for ORANGE.
In Information Processing Letters,
2020.
Gaoli Wang, Fukang Liu, Binbin Cui, Florian Mendel, Christoph Dobraunig
.
Improved (semi-free-start/near-) collision and distinguishing attacks on round-reduced RIPEMD-160.
In Designs, Codes and Cryptography,
2020.
Christoph Dobraunig, Farokhlagha Moazami, Christian Rechberger, Hadi Soleimany
.
Framework for faster key search using related-key higher-order differential properties: applications to Agrasta.
In IET Information Security,
2020.
Christoph Dobraunig, Bart Mennink
.
Security of the Suffix Keyed Sponge.
In IACR Transactions on Symmetric Cryptology,
2019.
Fukang Liu, Christoph Dobraunig, Florian Mendel, Takanori Isobe, Gaoli Wang, Zhenfu Cao
.
New Semi-Free-Start Collision Attack Framework for Reduced RIPEMD-160.
In IACR Transactions on Symmetric Cryptology,
2019.
Ralph Ankele, Christoph Dobraunig, Jian Guo, Eran Lambooij, Gregor Leander, Yosuke Todo
.
Zero-Correlation Attacks on Tweakable Block Ciphers with Linear Tweakey Expansion.
In IACR Transactions on Symmetric Cryptology,
2019.
Christoph Dobraunig, Maria Eichlseder, Thomas Korak, Stefan Mangard, Florian Mendel, Robert Primas
.
SIFA: Exploiting Ineffective Fault Inductions on Symmetric Cryptography.
In IACR Transactions on Cryptographic Hardware and Embedded Systems,
2018.
Christoph Dobraunig, Maria Eichlseder, Stefan Mangard, Florian Mendel, Thomas Unterluggauer
.
ISAP - Towards Side-Channel Secure Authenticated Encryption.
In IACR Transactions on Symmetric Cryptology,
2017.
Hannes Groß, Erich Wenger, Christoph Dobraunig, Christoph Ehrenhöfer
.
Ascon hardware implementations and side-channel evaluation.
In Microprocessors and Microsystems - Embedded Hardware Design 52,
2017.
Christoph Dobraunig, Maria Eichlseder, Daniel Kales, Florian Mendel
.
Practical Key-Recovery Attack on MANTIS 5.
In IACR Transactions on Symmetric Cryptology,
2016.
Conference & Workshop Papers
Christoph Dobraunig, Krystian Matusiewicz, Bart Mennink, Alexander Tereschenko
.
Efficient Instances of Docked Double Decker with AES, and Application to Authenticated Encryption.
In EUROCRYPT,
2025.
Bharath Namboothiry, David Durham, Christoph Dobraunig, Michael LeMay
.
Cryptographic Memory Tagging: Towards Stateless Integrity.
In HASP@MICRO,
2024.
Christoph Dobraunig, Maria Eichlseder, Florian Mendel, Martin Schläffer
.
Ascon MAC, PRF, and Short-Input PRF - Lightweight, Fast, and Efficient Pseudorandom Functions.
In CT-RSA,
2024.
Christoph Dobraunig, Bart Mennink
.
Generalized Initialization of the Duplex Construction.
In ACNS,
2024.
Marcel Nageler, Christoph Dobraunig, Maria Eichlseder
.
Information-Combining Differential Fault Attacks on DEFAULT.
In EUROCRYPT,
2022.
Christoph Dobraunig, Bart Mennink, Robert Primas
.
Leakage and Tamper Resilient Permutation-Based Cryptography.
ACM CCS,
2022.
Christoph Dobraunig, Lorenzo Grassi, Anna Guinet, Daniël Kuijsters
.
Ciminion: Symmetric Encryption Based on Toffoli-Gates over Large Finite Fields.
In EUROCRYPT,
2021.
Christoph Dobraunig, Bart Mennink
.
Leakage Resilient Value Comparison With Application to Message Authentication.
In EUROCRYPT,
2021.
Tim Beyne, Yu Long Chen, Christoph Dobraunig, Bart Mennink
.
Multi-user Security of the Elephant v2 Authenticated Encryption Mode.
SAC,
2021.
Christoph Dobraunig, Bart Mennink
.
Leakage Resilience of the Duplex Construction.
In ASIACRYPT,
2019.
Christoph Dobraunig, Maria Eichlseder, Florian Mendel, Markus Schofnegger
.
Algebraic Cryptanalysis of Variants of Frit.
In SAC,
2019.
Fukang Liu, Christoph Dobraunig, Florian Mendel, Takanori Isobe, Gaoli Wang, Zhenfu Cao
.
Efficient Collision Attack Frameworks for RIPEMD-160.
In CRYPTO,
2019.
Christoph Dobraunig, Maria Eichlseder, Hannes Gross, Stefan Mangard, Florian Mendel, Robert Primas
.
Statistical Ineffective Fault Attacks on Masked AES with Fault Countermeasures.
In ASIACRYPT,
2018.
Christoph Dobraunig, Stefan Mangard, Florian Mendel, Robert Primas
.
Fault Attacks on Nonce-based Authenticated Encryption: Application to Keyak and Ketje.
In SAC,
2018.
Christoph Dobraunig, Maria Eichlseder, Lorenzo Grassi, Virginie Lallemand, Gregor Leander, Eik List, Florian Mendel, Christian Rechberger
.
Rasta: A cipher with low ANDdepth and few ANDs per bit.
In CRYPTO,
2018.
Christoph Dobraunig, Maria Eichlseder, Thomas Korak, Florian Mendel
.
Side-Channel Analysis of Keymill.
In COSADE,
2017.
Christoph Dobraunig, Eik List
.
Impossible-Differential and Boomerang Cryptanalysis of Round-Reduced Kiasu-BC.
In CT-RSA,
2017.
Christoph Dobraunig, Maria Eichlseder, Thomas Korak, Victor Lomné, Florian Mendel
.
Statistical Fault Attacks on Nonce-Based Authenticated Encryption Schemes.
In ASIACRYPT,
2016.
Christoph Dobraunig, Maria Eichlseder, Florian Mendel
.
Cryptanalysis of Simpira v1.
In SAC,
2016.
Christoph Dobraunig, Maria Eichlseder, Florian Mendel
.
Square Attack on 7-Round Kiasu-BC.
In ACNS,
2016.
Christoph Dobraunig, Maria Eichlseder, Florian Mendel
.
Analysis of the Kupyna-256 Hash Function.
In FSE,
2016.
Christoph Dobraunig, Maria Eichlseder, Florian Mendel
.
Analysis of SHA-512/224 and SHA-512/256.
In ASIACRYPT,
2015.
Christoph Dobraunig, Maria Eichlseder, Florian Mendel
.
Heuristic Tool for Linear Cryptanalysis with Applications to CAESAR Candidates.
In ASIACRYPT,
2015.
Christoph Dobraunig, Maria Eichlseder, Florian Mendel
.
Higher-Order Cryptanalysis of LowMC.
In ICISC,
2015.
Christoph Dobraunig, François Koeune, Stefan Mangard, Florian Mendel, François-Xavier Standaert
.
Towards Fresh and Hybrid Re-Keying Schemes with Beyond Birthday Security.
In CARDIS,
2015.
Hannes Groß, Erich Wenger, Christoph Dobraunig, Christoph Ehrenhöfer
.
Suit up! - Made-to-Measure Hardware Implementations of Ascon.
In DSD,
2015.
Christoph Dobraunig, Maria Eichlseder, Florian Mendel
.
Forgery Attacks on Round-Reduced ICEPOLE-128.
In SAC,
2015.
Christoph Dobraunig, Maria Eichlseder, Florian Mendel, Martin Schläffer
.
Cryptanalysis of Ascon.
In CT-RSA,
2015.
Christoph Dobraunig, Maria Eichlseder, Florian Mendel
.
Related-Key Forgeries for Prøst-OTR.
In FSE,
2015.
Christoph Dobraunig, Maria Eichlseder, Stefan Mangard, Florian Mendel
.
On the Security of Fresh Re-keying to Counteract Side-Channel and Fault Attacks.
In CARDIS,
2014.
Andrey Bogdanov, Christoph Dobraunig, Maria Eichlseder, Martin M. Lauridsen, Florian Mendel, Martin Schläffer, Elmar Tischhauser
.
Key Recovery Attacks on Recent Authenticated Ciphers.
In LATINCRYPT,
2014.
Christoph Dobraunig, Florian Mendel, Martin Schläffer
.
Differential Cryptanalysis of SipHash.
In SAC,
2014.
Other Publications
Christoph Dobraunig, Maria Eichlseder, Florian Mendel, Martin Schläffer
.
Ascon.
NIST Finalist,
2021.
Tim Beyne, Yu Long Chen, Christoph Dobraunig, Bart Mennink
.
Elephant.
NIST Finalist,
2021.
Christoph Dobraunig, Maria Eichlseder, Stefan Mangard, Florian Mendel, Bart Mennink, Robert Primas, Thomas Unterluggauer
.
ISAP.
NIST Finalist,
2021.
Jean-Philippe Aumasson, Daniel J. Bernstein, Christoph Dobraunig, Maria Eichlseder, Scott Fluhrer, Stefan-Lukas Gazdag, Andreas Hülsing, Panos Kampanakis, Stefan Kölbl, Tanja Lange, Martin M. Lauridsen, Florian Mendel, Ruben Niederhagen, Christian Rechberger, Joost Rijneveld, Peter Schwabe
.
SPHINCS+.
Submission to the NIST Post-Quantum Cryptography Call,
2019.
Christoph Dobraunig, Maria Eichlseder, Florian Mendel
.
Security Evaluation of SHA-224, SHA-512/224, and SHA-512/256.
Tech. Report CRYPTREC,
2014.
Christoph Dobraunig, Maria Eichlseder, Florian Mendel, Martin Schläffer
.
Ascon.
CAESAR: first choice for lightweight applications (resource constrained environments),
2014.
Service
Program Committee
- 2024: Africacrypt, TCHES/CHES, ToSC/FSE
- 2023: Crypto, Eurocrypt, ISC, TCHES/CHES, ToSC/FSE
- 2022: Africacrypt, ToSC/FSE
- 2021: EuroS&P, ToSC/FSE
- 2020: EuroS&P, ToSC/FSE
- 2019: ToSC/FSE
Journal Reviewer
Designs, Codes and Cryptography; IEEE Transactions on Information Forensics & Security; IEEE Transactions on Very Large Scale Integration Systems; IET Information Security; Journal of Cryptographic Engineering; Journal of Cryptology; Journal of Mathematical Cryptology;
Contact
- christoph@dobraunig.com
- Mairist, St. Veit, 9300, Austria