Daniel Collins' Website

About Me:

I am a postdoc working with Juan Garay and Vassilis Zikas, currently at Texas A&M University and previously at Georgia Tech and Purdue University, and have been since June 2024.
I obtained a PhD from EPFL, Switzerland in cryptography under the supervision of Serge Vaudenay in April 2024; I worked at EPFL from September 2019 to April 2024.
Before this, I studied Mathematics and Computer Science at the University of Sydney, where I spent time under the supervision of Vincent Gramoli in distributed computing which culminated in an Honours thesis.
So far, I work on or have worked on the following topics:

Please feel free to get in touch if you would like to chat or collaborate.

Preprints:

Publications:

    2025
  1. GURKE: Group Unidirectional Ratcheted Key Exchange
    Daniel Collins, Paul Rösler
    CRYPTO 2025 (to appear)
  2. Towards Optimal Parallel Broadcast under a Dishonest Majority
    Daniel Collins, Sisi Duan, Julian Loss, Charalampos Papamanthou, Giorgos Tsimos, Haochen Wang
    FC 2025
    [preprint]
  3. Towards Leakage-Resilient Ratcheted Key Exchange
    Daniel Collins, Simone Colombo, Sina Schaeffler
    PKC 2025
    [preprint]
  4. Juggernaut: Efficient Crypto-Agnostic Byzantine Agreement
    Daniel Collins, Yuval Efron, Jovan Komatovic
    EUROCRYPT 2025
    [preprint]
  5. Real World Deniability in Messaging
    Daniel Collins, Simone Colombo, Loïs Huguenin-Dumittan
    PETS 2025
    Presented at RWC 2023
    [preprint] [rwc talk] [slides]

    6. 2024
  6. On the Tight Security of the Double Ratchet
    Daniel Collins, Doreen Riepel, Si An Oliver Tran
    CCS 2024
    [preprint]
  7. Provably Secure Online Authenticated Encryption and Bidirectional Online Channels
    Arghya Bhattacharjee, Ritam Bhaumik, Daniel Collins, Mridul Nandi
    SAC 2024
    [preprint]
  8. K-Waay: Fast and Deniable Post-Quantum X3DH without Ring Signatures
    Daniel Collins, Loïs Huguenin-Dumittan, Ngoc Khanh Nguyen, Nicolas Rolin, Serge Vaudenay
    USENIX Security 2024
    RWPQC 2023 (Lightning talk)
    [preprint] [rwpqc slides]

    9. 2023
  9. WhatsUpp with Sender Keys? Analysis, Improvements and Security Proofs
    David Balbás, Daniel Collins, Phillip Gajland
    ASIACRYPT 2023
    Poster at USENIX Security 2023
    CAW 2024 (affiliated with EUROCRYPT 2024)
    [preprint] [poster]
    [preliminary version] (Best Paper Runner-Up at RECSI 2022)
  10. Network-Agnostic Security Comes (Almost) for Free in DKG and MPC
    Renas Bacho, Daniel Collins, Chen-Da Liu-Zhang, Julian Loss
    CRYPTO 2023
    [preprint] [talk] [slides]
  11. On Active Attack Detection in Messaging with Immediate Decryption
    Khashayar Barooti, Daniel Collins, Simone Colombo, Loïs Huguenin-Dumittan, Serge Vaudenay
    CRYPTO 2023
    Talk at NYU Crypto Reading Group 16 August 2023
    [preprint] [talk] [crypto slides] [nyu slides]
  12. Cryptographic Administration for Secure Group Messaging
    David Balbás, Daniel Collins, Serge Vaudenay
    USENIX Security 2023
    Swiss Crypto Day 2023
    [preprint] [scd slides]
  13. Near Collision Attack Against Grain v1
    Subhadeep Banik, Daniel Collins, Willi Meier
    ACNS 2023
    [preprint]

    14. 2022
  14. A Small GIFT-COFB: Lightweight Bit-Serial Architectures
    Andrea Caforio, Daniel Collins, Subhadeep Banik, Francesco Regazzoni
    AFRICACRYPT 2022
    [preprint]
  15. Optimal Symmetric Ratcheting for Secure Communication
    Hailun Yan, Serge Vaudenay, Daniel Collins, Andrea Caforio
    The Computer Journal (2022)

    16. 2021
  16. Improving First-Order Threshold Implementations of SKINNY
    Andrea Caforio, Daniel Collins, Ognjen Glamocanin, Subhadeep Banik
    INDOCRYPT 2021
    [preprint]

    17. 2020
  17. Online Payments by Merely Broadcasting Messages
    Daniel Collins, Rachid Guerraoui, Jovan Komatovic, Petr Kuznetsov, Matteo Monti, Matej Pavlovic, Yvonne-Anne Pignolet, Dragos-Adrian Seredinschi, Andrei Tonkikh, Athanasios Xygkis
    DSN 2020 (Best Paper Runner-Up)
    [preprint]
  18. Anonymity Preserving Byzantine Vector Consensus
    Christian Cachin, Daniel Collins, Tyler Crain, Vincent Gramoli
    ESORICS 2020
    [preprint] [talk]

Program Committee/Editorial Board:

PhD Thesis:

Selected research visits:

Where I can be found: