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 privacy, such as (non-interactive) zero-knowledge proof systems
Efficient quantum-secure lattice-based cryptosystems
Recently, I am passionate in proposing and improving security proofs for real-world protocols, which bridges the gap between theoretical and practical cryptography. I am also interested in fine-grained cryptography.
2022 – 2026: NTNU Outstanding Academic Fellows Programme (Career development award)
2021 – 2025: Principal investigator of a Young Research Talent project, Reserch Council of Norway, under the topic ground-breaking research (FRIPRO)
2021 – 2023: Principal investigator (jointly with Sanjam Garg from UC Berkeley) of a Peder Sather Grant
What an exciting year!!
Starting October, I take up the Professorship of Information Security at the University of Kassel (Germany). Grateful for this opportunity and also the past fantastic years at NTNU.
During the summer, 2 of my papers got accepted at the prestigious Journal of Cryptology; and 3 papers at ASIACRYPT 2023. Together with early acceptance at CRYPTO and EUROCRYPT, I got my grand slam of Cryptology this year.
August: My honor to be invited to the Program Committee of top-tier conferences, CRYPTO and EUROCRYPT 2024
Program Committee Member
IACR CRYPTO: 2024
IACR PKC: 2022
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
Teaching and Supervision Activities
Elementary Discrete Mathematics (NTNU, Spring 2021)
Cryptography (NTNU, Fall 2020, Fall 2021, Fall 2022, Fall 2023)
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
(Selected) Thesis Supervisions
Benedikt Wagner (Master): Efficient Signatures in the Post-Quantum Setting
(Results led to publications at PKC and PQCrypto and awarded the SICK Science Award 2019 for the best bachelor thesis)
Roman Langrehr (Master): Unbounded HIBE with Better Security
(Results led to publications at ASIACRYPT and PKC)
Benedikt Wagner (Bachelor): Tightly Secure Blind Signatures
(It was awarded the SICK Science Award 2019 for the best bachelor thesis )
Julia Kastner (Master): On Knowledge Assumptions and the Algebraic Group Model
Roman Langrehr (Bachelor): Identity-based Cryptography from Affine MACs
Benedikt Wagner from 2019 to 2020
(Results led to a publication at PQCrypto 2021)
Roman Langrehr from 2018 to 2019.
(Results led to an invitation to publish in the Journal of Cryptology)
A Generic Construction of Tightly Secure Password-based Authenticated Key Exchange
with Runzhi Zeng (appeared at ASIACRYPT 2023, full version)
Tighter Security for Generic Authenticated Key Exchange in the QROM
with Benedikt Wagner and Runzhi Zeng. (appeared at ASIACRYPT 2023, full version)
A Simple and Efficient Framework of Proof Systems for NP
with Yuyu Wang, Chuanjie Su, and Yu Chen. (appeared at ASIACRYPT 2023, full version)
Fine-Grained Secure Attribute-Based Encryption
with Yuyu Wang and Yu Chen (appeared at Journal of Cryptology, 2023)
Compact Structure-preserving Signatures with Almost Tight Security
with Masayuki Abe, Dennis Hofheinz, Ryo Nishimaki, and Miyako Ohkubo (appeared at Journal of Cryptology, 2023)
Generic Constructions of Master-Key KDM Secure Attribute-based Encryption
with Chen Qian and Benedikt Wagner. (appeared at Designs, Codes and Cryptography, 2023)
Lattice-based Authenticated Key Exchange with Tight Security
with Benedikt Wagner and Runzhi Zeng (appeared at CRYPTO 2023, full version)
Chopsticks: Fork-Free Two-Round Multi-Signatures from Non-Interactive Assumptions
with Benedikt Wagner (appeared at EUROCRYPT 2023, full version)
Backward-Leak Uni-Directional Updatable Encryption from (Homomorphic) Public Key Encryption
with Yao Jiang Galteland (appeared at PKC 2023, full version)
Multi-User CDH Problems and the Concrete Security of NAXOS and HMQV
with Eike Kiltz, Doreen Riepel, and Magnus Ringerud (appeared at CT-RSA 2023, full version)
Signed (Group) Diffie-Hellman Key Exchange with Tight Security
with Chen Qian and Magnus Ringerud (appeared at Journal of Cryptology, 2022)
Compact and Tightly Selective-Opening Secure Public-key Encryption Schemes
with Runzhi Zeng (appeared at ASIACRYPT 2022)
Unconditionally Secure NIZK in the Fine-Grained Setting
with Yuyu Wang (appeared at ASIACRYPT 2022, full version)
Non-Interactive Zero-Knowledge Proofs with Fine-Grained Security
with Yuyu Wang (appeared at EUROCRYPT 2022, full version)
Lattice-based Signatures with Tight Adaptive Corruptions and More
with Benedikt Wagner (appeared at PKC 2022, full version)
Fine-grained Secure Attribute-based Encryption
with Yuyu Wang and Yu Chen (appeared at CRYPTO 2021)
Authenticated Key Exchange and Signatures with Tight Security in the Standard Model
with Shuai Han, Tibor Jager, Eike Kiltz, Shengli Liu, Doreen Riepel, and Sven Schäge (appeared at CRYPTO 2021, full version)
Short Identity-Based Signatures with Tight Security from Lattices
with Benedikt Wagner (appeared at PQCRYPTO 2021, full version)
Signed Diffie-Hellman Key Exchange with Tight Security
with Chen Qian and Magnus Ringerud (appeared at CT-RSA 2021, full version)
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, full version)
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.