2021
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Amler, Hendrik; Eckey, Lisa; Faust, Sebastian; Kaiser, Marcel; Sandner, Philipp; Schlosser, Benjamin DeFi-ning DeFi: Challenges & Pathway Inproceedings IEEE International Conference on Blockchain and Cryptocurrency (ICBC21), IEEE, 2021. Abstract | Links | BibTeX @inproceedings{amler2021defining,
title = {DeFi-ning DeFi: Challenges & Pathway},
author = {Hendrik Amler and Lisa Eckey and Sebastian Faust and Marcel Kaiser and Philipp Sandner and Benjamin Schlosser},
url = {https://arxiv.org/abs/2101.05589},
year = {2021},
date = {2021-01-14},
booktitle = {IEEE International Conference on Blockchain and Cryptocurrency (ICBC21)},
publisher = {IEEE},
abstract = {The decentralized and trustless nature of cryptocurrencies and blockchain technology leads to a shift in the digital world. The possibility to execute small programs, called smart contracts, on cryptocurrencies like Ethereum opened doors to countless new applications. One particular exciting use case is decentralized finance (DeFi), which aims to revolutionize traditional financial services by founding them on a decentralized infrastructure. We show the potential of DeFi by analyzing its advantages compared to traditional finance. Additionally, we survey the state-of-the-art of DeFi products and categorize existing services. Since DeFi is still in its infancy, there are countless hurdles for mass adoption. We discuss the most prominent challenges and point out possible solutions. Finally, we analyze the economics behind DeFi products. By carefully analyzing the state-of-the-art and discussing current challenges, we give a perspective on how the DeFi space might develop in the near future. },
howpublished = {ArXiv, Nr. 2101.05589},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
The decentralized and trustless nature of cryptocurrencies and blockchain technology leads to a shift in the digital world. The possibility to execute small programs, called smart contracts, on cryptocurrencies like Ethereum opened doors to countless new applications. One particular exciting use case is decentralized finance (DeFi), which aims to revolutionize traditional financial services by founding them on a decentralized infrastructure. We show the potential of DeFi by analyzing its advantages compared to traditional finance. Additionally, we survey the state-of-the-art of DeFi products and categorize existing services. Since DeFi is still in its infancy, there are countless hurdles for mass adoption. We discuss the most prominent challenges and point out possible solutions. Finally, we analyze the economics behind DeFi products. By carefully analyzing the state-of-the-art and discussing current challenges, we give a perspective on how the DeFi space might develop in the near future. |
2020
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iBlockchain Konsortium, iBlockchain Policy Paper: Empfehlungen und Erkenntnisse für die Politik Miscellaneous medium.com, 2020. Abstract | Links | BibTeX @misc{iBlockchainKonsortium2020,
title = {iBlockchain Policy Paper: Empfehlungen und Erkenntnisse für die Politik},
author = {iBlockchain Konsortium},
url = {https://iblockchain-projekt.de/wp-content/uploads/2021/02/Policy_paper_final.pdf
https://medium.com/@industrial_blockchain/iblockchain-policy-paper-empfehlungen-und-erkenntnisse-f%C3%BCr-die-politik-b5b24ad8f800},
year = {2020},
date = {2020-12-14},
abstract = {In diesem Artikel werden aus der Arbeit des iBlockchain-Projektes hervorgegangene
technologische und regulatorische Erkenntnisse und Anforderungen zum Thema
Blockchain und DLT im Industrie-Kontext zusammengefasst.},
howpublished = {medium.com},
keywords = {},
pubstate = {published},
tppubtype = {misc}
}
In diesem Artikel werden aus der Arbeit des iBlockchain-Projektes hervorgegangene
technologische und regulatorische Erkenntnisse und Anforderungen zum Thema
Blockchain und DLT im Industrie-Kontext zusammengefasst. |
Hebborn, Phil; Lambin, Baptiste; Leander, Gregor; Todo, Yosuke Lower Bounds on the Degree of Block Ciphers Inproceedings Advances in Cryptology - ASIACRYPT 2020 - 26th International Conference on the Theory and Application of Cryptology and Information Security, 2020. Abstract | Links | BibTeX @inproceedings{Hebborn2020,
title = {Lower Bounds on the Degree of Block Ciphers},
author = {Phil Hebborn and Baptiste Lambin and Gregor Leander and Yosuke Todo},
url = {https://eprint.iacr.org/2020/1051},
year = {2020},
date = {2020-12-07},
booktitle = {Advances in Cryptology - ASIACRYPT 2020 - 26th International Conference on the Theory and Application of Cryptology and Information Security},
abstract = {Only the method to estimate the upper bound of the algebraic degree on block ciphers is known so far, but it is not useful for the designer to guarantee the security. In this paper we provide meaningful lower bounds on the algebraic degree of modern block ciphers.},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
Only the method to estimate the upper bound of the algebraic degree on block ciphers is known so far, but it is not useful for the designer to guarantee the security. In this paper we provide meaningful lower bounds on the algebraic degree of modern block ciphers. |
Erwig, Andreas; Faust, Sebastian; Riahi, Siavash; Stöckert, Tobias CommiTEE: An Efficient and Secure Commit-Chain Protocol using TEEs Miscellaneous Cryptology ePrint Archive, Report 2020/1486, 2020. Abstract | Links | BibTeX @misc{cryptoeprint:2020:1486,
title = {CommiTEE: An Efficient and Secure Commit-Chain Protocol using TEEs},
author = {Andreas Erwig and Sebastian Faust and Siavash Riahi and Tobias Stöckert},
url = {https://eprint.iacr.org/2020/1486},
year = {2020},
date = {2020-11-27},
abstract = {Permissionless blockchain systems such as Bitcoin or Ethereum are slow and expensive, since transactions are processed in a distributed network by a large set of parties. To improve on these shortcomings, a prominent approach is given by so-called 2nd-layer protocols. In these protocols parties process transactions off-chain directly between each other, thereby drastically reducing the costly and slow interaction with the blockchain. In particular, in the optimistic case, when parties behave honestly, no interaction with the blockchain is needed. One of the most popular off-chain solutions are Plasma protocols (often also called commit-chains). These protocols are orchestrated by a so-called operator that maintains the system and processes transactions between parties. Importantly, the operator is trustless, i.e., even if it is malicious users of the system are guaranteed to not lose funds. To achieve this guarantee, Plasma protocols are highly complex and require involved and expensive dispute resolution processes. This has significantly slowed down development and deployment of these systems.
In this work we propose CommiTEE-- a simple and efficient Plasma system leveraging the power of trusted execution environments (TEE). Besides its simplicity, our protocol requires minimal interaction with the blockchain, thereby drastically reducing costs and improving efficiency. An additional benefit of our solution is that it allows for switching between operators, in case the main operator goes offline due to system failure, or behaving maliciously. We implemented and evaluated our system over Ethereum and show that it is at least 2
times (and in some cases more than 16 times) cheaper in terms of communication complexity when compared to existing Plasma implementations. Moreover, for protocols using zero-knowledge proofs (like NOCUST-ZKP), CommiTEE decreases the on-chain gas cost by a factor ≈19 compared to prior solution. },
howpublished = {Cryptology ePrint Archive, Report 2020/1486},
keywords = {},
pubstate = {published},
tppubtype = {misc}
}
Permissionless blockchain systems such as Bitcoin or Ethereum are slow and expensive, since transactions are processed in a distributed network by a large set of parties. To improve on these shortcomings, a prominent approach is given by so-called 2nd-layer protocols. In these protocols parties process transactions off-chain directly between each other, thereby drastically reducing the costly and slow interaction with the blockchain. In particular, in the optimistic case, when parties behave honestly, no interaction with the blockchain is needed. One of the most popular off-chain solutions are Plasma protocols (often also called commit-chains). These protocols are orchestrated by a so-called operator that maintains the system and processes transactions between parties. Importantly, the operator is trustless, i.e., even if it is malicious users of the system are guaranteed to not lose funds. To achieve this guarantee, Plasma protocols are highly complex and require involved and expensive dispute resolution processes. This has significantly slowed down development and deployment of these systems.
In this work we propose CommiTEE-- a simple and efficient Plasma system leveraging the power of trusted execution environments (TEE). Besides its simplicity, our protocol requires minimal interaction with the blockchain, thereby drastically reducing costs and improving efficiency. An additional benefit of our solution is that it allows for switching between operators, in case the main operator goes offline due to system failure, or behaving maliciously. We implemented and evaluated our system over Ethereum and show that it is at least 2
times (and in some cases more than 16 times) cheaper in terms of communication complexity when compared to existing Plasma implementations. Moreover, for protocols using zero-knowledge proofs (like NOCUST-ZKP), CommiTEE decreases the on-chain gas cost by a factor ≈19 compared to prior solution. |
Alkadri, Nabil Alkeilani; Das, Poulami; Erwig, Andreas; Faust, Sebastian; Krämer, Juliane; Riahi, Siavash; Struck, Patrick Deterministic Wallets in a Quantum World Inproceedings CCS ’20- Proceedings of the 2020 ACM SIGSAC Conference on Computer and Communications Security, ACM, 2020. BibTeX @inproceedings{Alkadri2020,
title = {Deterministic Wallets in a Quantum World},
author = {Nabil Alkeilani Alkadri and Poulami Das and Andreas Erwig and Sebastian Faust and Juliane Krämer and Siavash Riahi and Patrick Struck},
year = {2020},
date = {2020-11-09},
booktitle = {CCS ’20- Proceedings of the 2020 ACM SIGSAC Conference on Computer and Communications Security},
publisher = {ACM},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
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