Researcher Profile

Field: Cyber Security

Main Research: Cryptography

Experience: My main research interests are in the field of public key cryptography with a focus on post-quantum signature schemes and modern public key building blocks, including various forms of encryption and signature schemes, as well as their application in secure communication and cloud computing. I am one of the designers of the Picnic post-quantum digital signature scheme, which is currently a round 2 candidate candiate in NIST's post-quantum crypto standardization project.

• 2016-2019: University assistent
  IAIK, Graz University of Technolog / Austria
• 2015-2016: Project assistent
  IAIK, Graz University of Technolog / Austria

• Post-Quantum Zero-Knowledge and Signatures from Symmetric-Key Primitives
  Author(s): Melissa Chase, David Derler, Steven Goldfeder Claudio Orlandi, Sebastian Ramacher, Christian Rechberger, Daniel Slamanig, Greg Zaverucha
  Conference ACM CCS, Dallas, USA
• Linear Equivalence of Block Ciphers with Partial Non-Linear Layers: Application to LowMC
  Author(s): Itai Dinur, Daniel Kales, Angela Promitzer, Sebastian Ramacher, Christian Rechberger
  Conference EUROCRYPT 2019, Darmstadt, Germany
• Feistel Structures for MPC, and More
  Author(s): Martin R. Albrecht, Lorenzo Grassi, Léo Perrin, Sebastian Ramacher, Christian Rechberger, Dragos Rotaru, Arnab Roy, Markus Schofnegger
  Conference ESORICS 2019
• Revisiting User Privacy for Certificate Transparency
  Author(s): Daniel Kales, Olamide Omolola, Sebastian Ramacher
  Conference EuroS&P 2019
• Short Double- and N-Times-Authentication-Preventing Signatures from ECDSA and More
  Author(s): David Derler, Sebastian Ramacher, Daniel Slamanig
  Conference EuroS&P 2018
• Revisiting Proxy Re-encryption: Forward Secrecy, Improved Security, and Applications
  Author(s): David Derler, Stephan Krenn, Thomas Lorünser, Sebastian Ramacher, Daniel Slamanig, Christoph Striecks
  Conference PKC 2018
• Post-Quantum Zero-Knowledge Proofs for Accumulators with Applications to Ring Signatures from Symmetric-Key Primitives
  Author(s): David Derler, Sebastian Ramacher, Daniel Slamanig
  Conference PQCrypto 2018
• Generic Double-Authentication Preventing Signatures and a Post-quantum Instantiation
  Author(s): David Derler, Sebastian Ramacher, Daniel Slamanig
  Conference ProvSec 2018
• Homomorphic Proxy Re-Authenticators and Applications to Verifiable Multi-User Data Aggregation
  Author(s): David Derler, Sebastian Ramacher, Daniel Slamanig
  Conference FC 2017

• IT security (2016)
  Graz University of Technology
• IT security (2017)
  Graz University of Technology
• IT security (2018)
  Graz University of Technology
• Modern public key cryptography (2017)
  Graz University of Technology
• Modern public key cryptography (2018)
  Graz University of Technology
• Modern public key cryptography (2019)
  Graz University of Technology

• Project homepage Personal homepage
• Publications AIT publications database