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Christoph Dobraunig

Research Scientist

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 authenticated encryption schemes Ascon, Elephant, and ISAP. Moreover, I am part of the SPHINCS+ Team.

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

Ascon v1.2: Lightweight Authenticated Encryption and Hashing. Journal of Cryptology, 2021.

PDF Website

Tightness of the Suffix Keyed Sponge Bound. In IACR Transactions on Symmetric Cryptology, 2020.

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Protecting against Statistical Ineffective Fault Attacks. In IACR Transactions on Cryptographic Hardware and Embedded Systems, 2020.

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Algebraic and Higher-Order Differential Cryptanalysis of Pyjamask-96. In IACR Transactions on Symmetric Cryptology, 2020.

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ISAP v2.0. In IACR Transactions on Symmetric Cryptology Special Issue, 2020.

PDF Code Video Website

Dumbo, Jumbo, and Delirium: Parallel Authenticated Encryption for the Lightweight Circus. In IACR Transactions on Symmetric Cryptology Special Issue, 2020.

PDF Code Website

Practical Forgeries for ORANGE. In Information Processing Letters, 2020.

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Improved (semi-free-start/near-) collision and distinguishing attacks on round-reduced RIPEMD-160. In Designs, Codes and Cryptography, 2020.

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Framework for faster key search using related-key higher-order differential properties: applications to Agrasta. In IET Information Security, 2020.

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Security of the Suffix Keyed Sponge. In IACR Transactions on Symmetric Cryptology, 2019.

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New Semi-Free-Start Collision Attack Framework for Reduced RIPEMD-160. In IACR Transactions on Symmetric Cryptology, 2019.

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Zero-Correlation Attacks on Tweakable Block Ciphers with Linear Tweakey Expansion. In IACR Transactions on Symmetric Cryptology, 2019.

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SIFA: Exploiting Ineffective Fault Inductions on Symmetric Cryptography. In IACR Transactions on Cryptographic Hardware and Embedded Systems, 2018.

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ISAP - Towards Side-Channel Secure Authenticated Encryption. In IACR Transactions on Symmetric Cryptology, 2017.

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Ascon hardware implementations and side-channel evaluation. In Microprocessors and Microsystems - Embedded Hardware Design 52, 2017.

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Practical Key-Recovery Attack on MANTIS 5. In IACR Transactions on Symmetric Cryptology, 2016.

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Conference & Workshop Papers

Ciminion: Symmetric Encryption Based on Toffoli-Gates over Large Finite Fields. In EUROCRYPT, 2021.

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Leakage Resilient Value Comparison With Application to Message Authentication. In EUROCRYPT, 2021.

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Leakage Resilience of the Duplex Construction. In ASIACRYPT, 2019.

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Algebraic Cryptanalysis of Variants of Frit. In SAC, 2019.

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Efficient Collision Attack Frameworks for RIPEMD-160. In CRYPTO, 2019.

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Statistical Ineffective Fault Attacks on Masked AES with Fault Countermeasures. In ASIACRYPT, 2018.

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Rasta: A cipher with low ANDdepth and few ANDs per bit. In CRYPTO, 2018.

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Fault Attacks on Nonce-based Authenticated Encryption: Application to Keyak and Ketje. In SAC, 2018.

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Side-Channel Analysis of Keymill. In COSADE, 2017.

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Impossible-Differential and Boomerang Cryptanalysis of Round-Reduced Kiasu-BC. In CT-RSA, 2017.

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Statistical Fault Attacks on Nonce-Based Authenticated Encryption Schemes. In ASIACRYPT, 2016.

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Cryptanalysis of Simpira v1. In SAC, 2016.

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Square Attack on 7-Round Kiasu-BC. In ACNS, 2016.

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Analysis of the Kupyna-256 Hash Function. In FSE, 2016.

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Analysis of SHA-512/224 and SHA-512/256. In ASIACRYPT, 2015.

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Heuristic Tool for Linear Cryptanalysis with Applications to CAESAR Candidates. In ASIACRYPT, 2015.

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Higher-Order Cryptanalysis of LowMC. In ICISC, 2015.

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Towards Fresh and Hybrid Re-Keying Schemes with Beyond Birthday Security. In CARDIS, 2015.

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Forgery Attacks on Round-Reduced ICEPOLE-128. In SAC, 2015.

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Suit up! - Made-to-Measure Hardware Implementations of Ascon. In DSD, 2015.

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Cryptanalysis of Ascon. In CT-RSA, 2015.

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Related-Key Forgeries for Prøst-OTR. In FSE, 2015.

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On the Security of Fresh Re-keying to Counteract Side-Channel and Fault Attacks. In CARDIS, 2014.

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Key Recovery Attacks on Recent Authenticated Ciphers. In LATINCRYPT, 2014.

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Differential Cryptanalysis of SipHash. In SAC, 2014.

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Compact Hardware Implementations of the Block Ciphers mCrypton, NOEKEON, and SEA. In INDOCRYPT, 2012.

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Other Publications

Ascon. NIST Finalist, 2021.

PDF Code Project Source Document Website

Elephant. NIST Finalist, 2021.

PDF Code Project Source Document Website

ISAP. NIST Finalist, 2021.

PDF Code Project Source Document Website

Exploring the Golden Mean Between Leakage and Fault Resilience and Practice. eprint, 2020.

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SPHINCS+. Submission to the NIST Post-Quantum Cryptography Call, 2019.

PDF Source Document Website

Security Evaluation of SHA-224, SHA-512/224, and SHA-512/256. Tech. Report CRYPTREC, 2014.

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Ascon. CAESAR: first choice for lightweight applications (resource constrained environments), 2014.

PDF Code Project Website

Service

Program Committee

External Reviewer

  • 2020: ACNS, ASIACRYPT, CHES, CRYPTO, EUROCRYPT
  • 2019: AFRICACRYPT, ASIACRYPT, CHES, IndoCrypt
  • 2018: ACNS, ASIACRYPT, COSADE, EUROCRYPT, Inscrypt, IWSEC
  • 2017: ASIACRYPT, EUROCRYPT, Inscrypt, SAC
  • 2016: ACNS, ASIACRYPT, CRYPTO, FSE, ICISC, ICISSP, IndoCrypt, Inscrypt
  • 2015: CHES, FSE, ICISC, IndoCrypt, Inscrypt, SAC
  • 2014: ASIACRYPT, CHES, ICISC, INSCRYPT

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;

Talks

  • Nov. 2020, FSE, “Isap v2.0”, virtual, joint work with: M. Eichlseder, S. Mangard, F. Mendel, Bart Mennink, Robert Primas, and T. Unterluggauer.
  • Aug. 2019, CRYPTO, “Efficient Collision Attack Frameworks for RIPEMD-160”, Santa Barbara, USA, joint work with: F. Liu, F. Mendel, T. Isobe, G. Wang , and Z. Cao.
  • Oct. 2018, Permutation-based Cryptography, “On ASCON and ISAP”, Milan, Italy, based on joint work with: M. Eichlseder, S. Mangard, F. Mendel, M. Schläffer, and T. Unterluggauer.
  • Sep. 2018, Simula UiB, “Statistical (Ineffective) Fault Attacks”, Bergen, Norway, based on joint work with: M. Eichlseder, H. Groß, T. Korak, V. Lomné, S. Mangard, F. Mendel, R. Primas.
  • Sep. 2018, Rump Session at CHES, “SIFA: Statistical Ineffective Fault Attacks”, Amsterdam, Netherlands, based on joint work with: M. Eichlseder, H. Groß, T. Korak, S. Mangard, F. Mendel, R. Primas.
  • Sep. 2018, Radboud University, “Statistical (Ineffective) Fault Attacks”, Nijmegen, Netherlands, based on joint work with: M. Eichlseder, H. Groß, T. Korak, Victor Lomné, S. Mangard, F. Mendel, R. Primas.
  • Aug. 2018, CRYPTO, “Rasta: A cipher with low ANDdepth and few ANDs per bit”, Santa Barbara, USA, joint work with: M. Eichlseder, L. Grassi, V. Lallemand, G. Leander, E. List, F. Mendel, and C. Rechberger.
  • Aug. 2018, Rump Session at CRYPTO, “SIFA: Statistical Ineffective Fault Attacks”, Santa Barbara, USA, based on joint work with: M. Eichlseder, H. Groß, T. Korak, S. Mangard, F. Mendel, R. Primas.
  • Jan. 2018, Joanneum Research, “On Side-channel and Fault Attacks”, Klagenfurt, Austria, based on joint work with: M. Eichlseder, T. Korak, V. Lomné, S. Mangard, F. Mendel, and T. Unterluggauer.
  • Jan. 2018, Dagstuhl Seminar, “Rasta: Designing a cipher with low ANDdepth and few ANDs per bit”, Dagstuhl, Germany, joint work with: M. Eichlseder, L. Grassi, V. Lallemand, G. Leander, F. Mendel, and C. Rechberger.
  • Apr. 2017, COSADE, “Side-Channel Analysis of Keymill”, Paris, France, joint work with: M. Eichlseder, T. Korak, and F. Mendel.
  • Mar. 2017, COST, “ISAP: Towards Side-channel Secure AE”, Amsterdam, Netherlands, joint work with: M. Eichlseder, S. Mangard, F. Mendel, and T. Unterluggauer.
  • Mar. 2017, FSE, “ISAP: Towards Side-channel Secure AE”, Tokyo, Japan, joint work with: M. Eichlseder, S. Mangard, F. Mendel, and T. Unterluggauer.
  • Jan. 2017, ESC, “ISAP: Towards Side-channel Secure AE”, Luxembourg, Luxembourg, joint work with: M. Eichlseder, S. Mangard, F. Mendel, and T. Unterluggauer.
  • Dec. 2016, ASIACRYPT, “Statistical Fault Attacks on Nonce-Based Authenticated Encryption Schemes”, Hanoi, Vietnam, joint work with: M. Eichlseder, T. Korak, V. Lomné, and F. Mendel.
  • June 2016, ACNS, “Square Attack on 7-Round Kiasu-BC”, Guildford, UK, joint work with: M. Eichlseder, and F. Mendel.
  • Dec. 2015, ASIACRYPT, “Heuristic Tool for Linear Cryptanalysis with Applications to CAESAR Candidates”, Auckland, New Zealand, joint work with: M. Eichlseder, and F. Mendel.
  • Aug. 2015, SAC, “Forgery Attacks on Round-Reduced ICEPOLE-128”, Sackville, Canada, joint work with: M. Eichlseder, and F. Mendel.
  • Jul. 2015, CECC, “Ascon: A Submission to CAESAR”, Klagenfurt, Austria, joint work with: M. Eichlseder, F. Mendel, and M. Schläffer.
  • Apr. 2015, CT-RSA, “Analysis of Ascon”, San Francisco, USA, joint work with: M. Eichlseder, F. Mendel, and M. Schläffer.
  • Nov. 2014, CARDIS, “On the Security of Fresh Re-keying”, Paris, France, joint work with: M. Eichlseder, S. Mangard, and F. Mendel.
  • Aug. 2014, SAC, “Differential Cryptanalysis of SipHash”, Montreal, Canada, joint work with: F. Mendel, and M. Schläffer.

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