Research
Decentralized systems and algorithms
Preprints
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Security of Nakamoto Consensus under Congestion
Lucianna Kiffer*, Joachim Neu*, Srivatsan Sridhar*, Aviv Zohar*, David Tse
March 2023
[ePrint:2023/381] [arXiv:2303.09113] [Source code]
Peer-reviewed
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Optimal Flexible Consensus and its Application to Ethereum
Joachim Neu*, Srivatsan Sridhar*, Lei Yang*, David Tse
Forthcoming in 45th IEEE Symposium on Security and Privacy (S&P'24), May 2024
[ePrint:2023/1211] [arXiv:2308.05096] [Source code] [ETHresear.ch: Super-finality] [Talk video (a16z crypto seminar)] -
Goldfish: No More Attacks on Ethereum
Francesco D'Amato*, Joachim Neu*, Ertem Nusret Tas*, David Tse*
Forthcoming in 28th International Conference on Financial Cryptography and Data Security (FC'24), March 2024
[ePrint:2022/1171] [arXiv:2209.03255] [Paradigm blog post] [Source code]
Non-archival: 6th Science of Blockchain Conference (SBC'23), August 2023
[Talk video] -
Short Paper: Accountable Safety Implies Finality
Joachim Neu*, Ertem Nusret Tas*, David Tse*
Forthcoming in 28th International Conference on Financial Cryptography and Data Security (FC'24), March 2024
[ePrint:2023/1301] [arXiv:2308.16902] -
Proofs of Proof-of-Stake with Sublinear Complexity
Shresth Agrawal*, Joachim Neu*, Ertem Nusret Tas*, Dionysis Zindros*
5th ACM Conference on Advances in Financial Technologies (AFT'23), October 2023
[doi:10.4230/LIPIcs.AFT.2023.14] [ePrint:2022/1642] [arXiv:2209.08673] [Source code: Experiments] [Source code: Kevlar optimistic light client] [Source code: Patronum trust anchor shim]
Also non-archival: Protocol Labs Research ConsensusDays '23, June 2023
[Talk video, presented by Shresth Agrawal] -
Two More Attacks On Proof-of-Stake GHOST/Ethereum
Joachim Neu*, Ertem Nusret Tas*, David Tse
2022 ACM Workshop on Developments in Consensus (ConsensusDay'22), November 2022
[doi:10.1145/3560829.3563560] [ePrint:2022/289] [arXiv:2203.01315] [Source code: Avalanche attack] [ETHresear.ch: Avalanche attack] [ETHresear.ch: Balancing attack for LMD] -
Longest Chain Consensus Under Bandwidth Constraint
Joachim Neu*, Srivatsan Sridhar*, Lei Yang*, David Tse, Mohammad Alizadeh
4th ACM Conference on Advances in Financial Technologies (AFT'22), September 2022
[doi:10.1145/3558535.3559777] [ePrint:2021/1545] [arXiv:2111.12332] [Talk video (Protocol Labs research seminar)] [Source code: Experiments]
Also non-archival: 5th Science of Blockchain Conference (SBC'22), August 2022
[Talk video, presented by Srivatsan Sridhar]
Also non-archival: 2022 ACM Workshop on Developments in Consensus (ConsensusDay'22), November 2022 -
Information Dispersal with Provable Retrievability for Rollups
Kamilla Nazirkhanova*, Joachim Neu*, David Tse
4th ACM Conference on Advances in Financial Technologies (AFT'22), September 2022
[doi:10.1145/3558535.3559778] [ePrint:2021/1544] [arXiv:2111.12323] [Source code: Semi-AVID-PR experiments]
Also non-archival: Protocol Labs Research ConsensusDays '23, June 2023
[Talk video, presented by Kamilla Nazirkhanova] -
Three Attacks on Proof-of-Stake Ethereum
Caspar Schwarz-Schilling, Joachim Neu, Barnabé Monnot, Aditya Asgaonkar, Ertem Nusret Tas, David Tse
26th International Conference on Financial Cryptography and Data Security (FC'22), May 2022
[doi:10.1007/978-3-031-18283-9_28] [ePrint:2021/1413] [arXiv:2110.10086] [Source code: Refined Gasper attack] [Talk video, presented by Caspar Schwarz-Schilling] [Talk video (FC'22 recording, presented by Caspar Schwarz-Schilling)] -
The Availability-Accountability Dilemma and its Resolution via Accountability
Gadgets
Joachim Neu*, Ertem Nusret Tas*, David Tse*
26th International Conference on Financial Cryptography and Data Security (FC'22), May 2022
[doi:10.1007/978-3-031-18283-9_27] [ePrint:2021/628] [arXiv:2105.06075] [Source code: Accountability gadget prototype] [ETHresear.ch: Refined Gasper attack] [Talk video (FC'22 recording, presented by Ertem Nusret Tas)]
Also non-archival: Protocol Labs Research ConsensusDays '21, October 2021
[Talk video] -
Ebb-and-Flow Protocols: A Resolution of the Availability-Finality Dilemma
Joachim Neu*, Ertem Nusret Tas*, David Tse*
42nd IEEE Symposium on Security and Privacy (S&P'21), May 2021
[doi:10.1109/SP40001.2021.00045] [ePrint:2020/1091] [arXiv:2009.04987] [Source code: Ebb-and-Flow] [Source code: Gasper attack] [ETHresear.ch: Gasper attack] [Video: IEEE S&P'21 60s preview] [Video: IEEE S&P'21 presentation] [Decentralized Thoughts blog post] [Talk at LA Blockchain Summit, presented by David Tse] [Talk at IBM Research Workshop on the Informational Lens, presented by David Tse] [zkCapital This Week in Blockchain Research Issue #74]
Also non-archival: 3rd Workshop on Theory and Practice of Blockchains, June 2021
[Talk video] -
Boomerang: Redundancy Improves Latency and Throughput in Payment-Channel Networks
Vivek Bagaria*, Joachim Neu*, David Tse
24th International Conference on Financial Cryptography and Data Security (FC'20), February 2020
[doi:10.1007/978-3-030-51280-4_17] [arXiv:1910.01834] [Source code]
Also non-archival: 4th Stanford Blockchain Conference (SBC'20), February 2020
[Talk video] [Bitcoin Optech Newsletter #86]
Technical reports
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Just In Time Ethereum Virtual Machine (JIT EVM)
Joachim Neu
August 2022
[Source code] [Talk video (Rust x Ethereum Day)] -
Data Availability Sampling: From Basics to Open Problems
Joachim Neu
August 2022
[Paradigm blog post] -
Cosmos without Tendermint: Exploring Narwhal and Bullshark
Joachim Neu, Georgios Konstantopoulos, Andrew Kirillov
July 2022
[Paradigm blog post] -
Snap-and-Chat Protocols: System Aspects
Joachim Neu*, Ertem Nusret Tas*, David Tse
October 2020
[arXiv:2010.10447]
Select survey talks
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Ethereum After The Merge: Is It Still Secure?
Joachim Neu
[Seminar talk at EPFL IC Colloquium] -
The Why and How of PoS Ethereum's Consensus Problem
Joachim Neu
[Survey talk at Devconnect/Ethconomics 2022]
Polar codes and quantization
Peer-reviewed
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Successive Cancellation Inactivation Decoding for Modified Reed-Muller and eBCH
Codes
Mustafa Cemil Coşkun, Joachim Neu, Henry D. Pfister
IEEE International Symposium on Information Theory (ISIT), June 2020
[doi:10.1109/ISIT44484.2020.9174226] [arXiv:2004.05969] -
Ternary Quantized Polar Code Decoders: Analysis and Design
Joachim Neu, Mustafa Cemil Coşkun, Gianluigi Liva
53rd Asilomar Conference on Signals, Systems, and Computers, November 2019
[doi:10.1109/IEEECONF44664.2019.9048843] [arXiv:1910.01176] [Source code]
Also non-archival: Poster at 2019 North American School of Information Theory (NASIT), July 2019
[Poster]
Master’s thesis
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Quantized Polar Code Decoders: Analysis and Design
Joachim Neu
Master's thesis at Technical University of Munich, September 2018
[arXiv:1902.10395]
Also non-archival: Talk at 2019 Oberpfaffenhofen Workshop on High Throughput Coding (OWHTC), February 2019
[Slides] -
Polar.jl: Julia implementation of polar coding
Joachim Neu
https://jneu.net/Polar.jl, January 2019
[Source code]
Multi-user information theory
Peer-reviewed
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Degrees-of-Freedom of the MIMO Three-Way Channel with Node-Intermittency
Joachim Neu, Anas Chaaban, Aydin Sezgin, Mohamed-Slim Alouini
IEEE Transactions on Information Theory, October 2019
Volume: 65, Issue: 10, Pages: 6781-6800
[doi:10.1109/TIT.2019.2919548] [arXiv:1708.08161]
Also non-archival: Poster at 2018 IEEE European School of Information Theory (ESIT), May 2018
[Poster]
Coding for DNA storage
Peer-reviewed
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Overcoming high nanopore basecaller error rates for DNA storage via basecaller-decoder
integration
and
convolutional codes
Shubham Chandak, Joachim Neu, Kedar Tatwawadi, Jay Mardia, Billy Lau, Matthew Kubit, Reyna Hulett, Peter Griffin, Mary Wootters, Tsachy Weissman, Hanlee Ji
45th IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP), May 2020
[doi:10.1109/ICASSP40776.2020.9053441] [bioRxiv:10.1101/2019.12.20.871939] [Supplementary material] [Talk video, presented by Shubham Chandak] -
Improved read/write cost tradeoff in DNA-based data storage using LDPC codes
Shubham Chandak, Kedar Tatwawadi, Billy Lau, Jay Mardia, Matthew Kubit, Joachim Neu, Peter Griffin, Mary Wootters, Tsachy Weissman, Hanlee Ji
57th Annual Allerton Conference on Communication, Control, and Computing, September 2019
[doi:10.1109/ALLERTON.2019.8919890] [bioRxiv:10.1101/770032]
Supplemental
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Large blocklength LDPC codes for Illumina sequencing-based DNA storage
Shubham Chandak, Kedar Tatwawadi, Billy Lau, Matthew Kubit, Jay Mardia, Joachim Neu, Hanlee Ji, Tsachy Weissman, Peter Griffin, Mary Wootters
ISMB/ECCB, July 2019
(Poster) [Talk video, presented by Shubham Chandak]
Coded distributed storage and content delivery
Peer-reviewed
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Babel Storage: Uncoordinated Content Delivery from Multiple Coded Storage Systems
Joachim Neu, Muriel Médard
IEEE Global Communications Conference (GLOBECOM), December 2019
[doi:10.1109/GLOBECOM38437.2019.9013383] [arXiv:1908.09271]
* Listed alphabetically.