I am a scientist in the Cryptography group at AIT Austrian Institute of Technology in Vienna, Austria. Before joining AIT, I was a postdoc working in the Cryptology and Cryptographic Security at IAIK, Graz University of Technology and received a PhD degree with distinction from Graz University of Technology in 2019. My main research interests are in the field of public key cryptography with a focus on post-quantum signature schemes and modern public key cryptography. I am a member of the International Association for Cryptologic Research (IACR) and the Austrian Mathematical Society (ÖMG).
| 2020 | Behzad Abdolmaleki, Sebastian Ramacher, Daniel Slamanig. Lift-and-Shift: Obtaining Simulation Extractable Subversion and Updatable SNARKs Generically. accepted at CCS 2020 | |
| 2020 | Daniel Kales, Sebastian Ramacher, Christian Rechberger, Roman Walch, Mario Werner. Efficient FPGA Implementations of LowMC and Picnic. CT-RSA 2020 | |
| 2019 | Andreas Abraham, Felix Hörandner, Olamide Omolola, Sebastian Ramacher. Privacy-Preserving eID Derivation for Self-Sovereign Identity Systems. ICICS 2019 | |
| 2019 | Felix Hörandner, Sebastian Ramacher,Simon Roth. Selective End-To-End Data-Sharing in the Cloud. ICISS 2019 | |
| 2019 | Martin R. Albrecht, Lorenzo Grassi, Léo Perrin, Sebastian Ramacher, Christian Rechberger, Dragos Rotaru, Arnab Roy, Markus Schofnegger. Feistel Structures for MPC, and More. Esorics 2019 | |
| 2019 | Daniel Kales, Olamide Omolola, Sebastian Ramacher. Revisting User Privacy for Certificate Transparency. EuroS&P 2019 | |
| 2019 | Itai Dinur, Daniel Kales, Angela Promitzer, Sebastian Ramacher, Christian Rechberger. Linear Equivalence of Block Ciphers with Partial Non-Linear Layers: Application to LowMC. Eurocrypt 2019 | |
| 2018 | David Derler, Sebastian Ramacher, Daniel Slamanig. Generic Double-Authentication Preventing Signatures and a Post-Quantum Instantiation. ProvSec 2018 | |
| 2018 | David Derler, Sebastian Ramacher, Daniel Slamanig. Post-Quantum Zero-Knowledge Proofs for Accumulators with Applications to Ring Signatures from Symmetric-Key Primitives. PQCrypto 2018 | |
| 2018 | David Derler, Stephan Krenn, Thomas Lorünser, Sebastian Ramacher, Daniel Slamanig, Christoph Striecks. Revisiting Proxy Re-Encryption: Forward Secrecy, Improved Security and Applications. PKC 2018 | |
| 2018 | David Derler, Sebastian Ramacher, Daniel Slamanig. Short Double- and N-Times-Authentication-Preventing Signatures from ECDSA and More. EuroS&P 2018 | |
| 2017 | Melissa Chase, David Derler, Steven Goldfeder Claudio Orlandi, Sebastian Ramacher, Christian Rechberger, Daniel Slamanig, Greg Zaverucha. Post-Quantum Zero-Knowledge and Signatures from Symmetric-Key Primitives. CCS 2017 | |
| 2017 | David Derler, Sebastian Ramacher, Daniel Slamanig. Homomorphic Proxy Re-Authenticators and Applications to Verifiable Multi-User Data Aggregation. FC 2017. | |
| 2015 | Alfred Geroldinger, Sebastian Ramacher, Andreas Reinhart. On v-Marot Mori rings and C-rings. Journal of the Korean Mathematical Society Vol. 52 No. 1/2015 |
| 2020 | Lift-and-Shift: Obtaining Simulation Extractable Subversion and Updatable SNARKs Generically at Graz University of Technology | |
| 2019 | Future-Proof Communication Security at the Industry Track of the Graz Security Week 2019 (together with Daniel Slamanig and Christoph Striecks) | |
| 2019 | Revisting User Privacy for Certificate Transparency at EuroS&P 2019 | |
| 2018 | Generic Double-Authentication Preventing Signatures and a Post-Quantum Instantiation at ProvSec 2018. | |
| 2018 | Post-Quantum Zero-Knowledge Proofs for Accumulators with Applications to Ring Signatures from Symmetric-Key Primitives at PQCrypto 2018. | |
| 2018 | Short Double- and N-Times-Authentication-Preventing Signatures from ECDSA and More at EuroS&P 2018. | |
| 2017 | Post-Quantum Zero-Knowledge and Signatures from Symmetric-Key Primitives at CCS 2017 on November 2, 2017 (together with Steven Goldfeder). | |
| 2017 | Post-Quantum Zero-Knowledge and Signatures from Symmetric-Key Primitives at Microsoft Research on October 26, 2017. | |
| 2017 | Post-Quantum Zero-Knowledge and Signatures from Symmetric-Key Primitives at CryptoSymposium 2017 on March 28, 2017. |
The Picnic family of digital signature algorithms is designed to provide security against attacks by quantum computers, in addition to attacks by classical computers. The building blocks are a zero-knowledge proof system (with post-quantum security), and symmetric key primitives like hash functions and block ciphers, with well-understood post-quantum security. An implementation optimized for speed is available on GitHub. Packages for Ubuntu are available as PPA.
Picnic is an Alternate Candiate in round 3 of the ongoing NIST PQC effort.
ACM CCS 2020; IFIP SEC 2020; PKC 2020; Eurocrypt 2019, 2017; MACIS 2019; ICISC 2019, 2016; IMA CC 2019; IFIP Summer School 2019; Africacrypt 2019, 2016; ACNS 2018; APKC 2018; CT-RSA 2018; ICDCS 2018; Asiacrypt 2017, 2016; SECPID 2017
While at Graz University of Technology, I was involved with the following courses:
I also had the pleasure to (co-)supervise various bachelor’s and master’s thesis: