I am an Associate Professor (førsteamanuensis) at NTNU (Norway).
Before that I was a postdoc at KIT (Germany) in the group of Dennis Hofheinz. In July 2016 I obtained my PhD from Ruhr-University Bochum (Germany) under the supervision of Eike Kiltz. I am interested in theoretical and practical cryptography in general.
Email: first.last at NTNU.no.
Cryptosystems that are scalable (tightly secure) and suitable for Big Data applications
Foundations for large-scale privacy, such as (non-interactive) zero-knowledge proof systems
Efficient quantum-secure lattice-based cryptosystems
Very recently, I am passionate in proposing and improving security proofs for real-world protocols, which bridges the gap between theoretical and practical cryptography.
Program Committee Member
Conferences: STOC, CRYPTO, EUROCRYPT, ASIACRYPT, TCC, PKC, CCS, CT-RSA, etc.
Journals: ACM Transactions on Algorithms; Journal of Cryptology; Designs, Codes, and Cryptography; IET Information Security; Theoretical Computer Science.
Organizing Committee Member
IACR EUROCRYPT: 2022
Elementary Discrete Mathematics (NTNU, Spring 2021)
Cryptography (NTNU, Fall 2020)
Digital Signatures (Lecture at KIT, Winter semester 2018/2019)
Cryptographic Protocols (Tutorial at RUB, Summer semester 2015)
Several student seminars at both KIT and RUB
Roman Langrehr (MA): Unbounded HIBE with Better Security
(Results led to publications at ASIACRYPT and PKC)
Benedikt Wagner (BA): Tightly Secure Blind Signatures
(It was awarded the SICK Science Award 2019 for the best bachelor thesis )
Julia Kastner (MA): On Knowledge Assumptions and the Algebraic Group Model
Roman Langrehr (BA): Identity-based Cryptography from Affine MACs
Roman Langrehr from KIT, from 2018 to 2019.
(Results led to an invitation to publish in the Journal of Cryptology)
Signed Diffie-Hellman Key Exchange with Tight Security
with Chen Qian and Magnus Ringerud (to appear at CT-RSA 2021)
Unbounded HIBE with Tight Security
with Roman Langrehr (appeared at ASIACRYPT 2020, full version)
Signatures with Tight Multi-User Security from Search Assumptions
with Magnus Ringerud (appeared at ESORICS 2020)
Hierarchical Identity-Based Encryption with Tight Multi-Challenge Security
with Roman Langrehr (appeared at PKC 2020, full version)
Shorter QA-NIZK and SPS with Tighter Security
with Masayuki Abe, Charanjit Jutla, Miyako Ohkubo, Arnab Roy, and Yuyu Wang (appeared at ASIACRYPT 2019, full version).
Tightly Secure Hierarchical Identity-Based Encryption
with Roman Langrehr (appeared at PKC 2019, full version). Invited and accepted to Journal of Cryptology.
Identity-Based Encryption Tightly Secure Under Chosen-Ciphertext Attacks
with Dennis Hofheinz and Dingding Jia (appeared at ASIACRYPT 2018, full version).
Simple and More Efficient PRFs with Tight Security from LWE and Matrix-DDH
with Tibor Jager and Rafael Kurek (appeared at ASIACRYPT 2018, full version)
More Efficient (Almost) Tightly Secure Structure-Preserving Signatures
with Romain Gay, Dennis Hofheinz, and Lisa Kohl (appeared at EUROCRYPT 2018, full version)
Tightly-Secure Signatures from Five-Move Identification Protocols
with Eike Kiltz and Julian Loss (appeared at ASIACRYPT 2017, full version)
Compact Structure-Preserving Signatures with Almost Tight Security
with Masayuki Abe, Dennis Hofheinz, Ryo Nishimaki, and Miyako Ohkubo (appeared at CRYPTO 2017, full version)
Optimal Security Proofs for Signatures from Identification Schemes
with Eike Kiltz and Daniel Masny (appeared at CRYPTO 2016, full version)
Unified Security Model of Authenticated Key Exchange with Specific Adversarial Capabilities
with Weiqiang Wen and Libin Wang (appeared at journal of IET Information Security)
Structure-Preserving Signatures from Standard Assumptions, Revisited
with Eike Kiltz and Hoeteck Wee (appeared at CRYPTO 2015, full version)
Tightly-Secure Signatures from Chameleon Hash Functions
with Olivier Blazy, Saqib A. Kakvi, and Eike Kiltz (appeared at PKC 2015, full version)
(Hierarchical) Identity-Based Encryption from Affine Message Authentication
with Olivier Blazy, and Eike Kiltz (appeared at CRYPTO 2014, full version)
You can also check my DBLP for my latest publications.