Session SBC-1

Invited Talk 1

Conference
10:00 AM — 11:00 AM HKT
Local
Jun 6 Sun, 10:00 PM — 11:00 PM EDT

Blockchains + Network Privacy = A Nightmare

Aniket Kate (Purdue university, USA)

0
The hope that cryptography and decentralization together might ensure robust user privacy was among the strongest drivers of the early success of blockchains like Bitcoin. A desire for privacy still permeates the growing blockchain user base today. Nevertheless, due to the inherently public nature of most blockchain ledgers, users’ privacy is severely restricted, and de-deanonymization attacks are prevalent. Several privacy solutions have been proposed to solve these issues, and a few have been implemented. Nevertheless, some key challenges remain unresolved and a few among those seem to be unsolvable in the information-theoretic and cryptographic sense. In this talk, we discuss privacy challenges, promising solutions, and unresolved privacy issues with blockchains. In particular, we study prominent privacy attacks, analyze the existing privacy solutions, and finally describe interesting unresolved challenges towards publishing and retrieving transactions privately.

Session Chair

Jian Liu

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Session SBC-2

Paper Session

Conference
11:00 AM — 1:30 PM HKT
Local
Jun 6 Sun, 11:00 PM — 1:30 AM EDT

Audita: A Blockchain-based Auditing Framework for Off-chain Storage

Danilo Francati (Stevens Institute of Technology, USA), Giuseppe Ateniese (Stevens Institute of Technology, USA), Abdoulaye Faye (Stevens Institute of Technology, USA), Andrea Maria Milazzo (Stevens Institute of Technology, USA), Angelo Massimo Perillo (Stevens Institute of Technology, USA), Luca Schiatti (Stevens Institute of Technology, USA) and Giuseppe Giordano (Stevens Institute of Technology, USA)

0
This talk does not have an abstract.

Dagger: Optimistic Byzantine Fault-Tolerance without Rollback

Hao Lu, Jian Liu (Zhejiang University, China), Peilun Li, Guozheng Yang, Cheng Zang (Zhejiang University, China), Jiajun Chen and Kui Ren (Zhejiang University, China)

0
This talk does not have an abstract.

AlphaBlock: An Evaluation Framework for Blockchain Consensus Algorithms

Zhijie Ren (University of Oxford, UK), Haitao Xiang (University of Oxford, UK), Ziheng Zhou (VeChain, China), Ning Wang (University of Oxford, UK) and Hanqing Jin (University of Oxford, UK)

0
This talk does not have an abstract.

Towards A First Step to Understand Flash Loan and Its Applications in DeFi Ecosystem

Dabao Wang (Zhejiang University, China), Siwei Wu (Zhejiang University, China), Ziling Lin (Zhejiang University, China), Lei Wu (Zhejiang University, China), Xingliang Yuan (Monash University, Australia), Yajin Zhou (Zhejiang University, China), Haoyu Wang (Beijing University of Posts and Telecommunications, China) and Kui Ren (Zhejiang University, China)

0
This talk does not have an abstract.

Proof of Comprehensive Performance

Chenhe Zhang (Zhejiang University, China), Xinle Cao (Zhejiang University, China), Jian Liu (Zhejiang University, China) and Kui Ren (Zhejiang University, China)

0
This talk does not have an abstract.

Session Chair

Jian Liu

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Session SBC-3

Invited Talk 2

Conference
1:30 PM — 2:30 PM HKT
Local
Jun 7 Mon, 1:30 AM — 2:30 AM EDT

Towards Secure and Scalable Blockchain Technologies

Ghassan Karame (NEC Labs, German)

0
The blockchain technology is rapidly gaining grounds as a key technology, especially in the financial and supply chain management sectors. This is largely due to the ability of the technology to (i) efficiently manage the sharing of digital resources between a large number of stakeholders and (ii) to efficiently manage disputes arising in the process. In spite of its many advantages, experience with existing blockchain proposals reveals that there are still many challenges that need to be overcome prior to any large scale industrial adoption, namely: Scalability. Existing permissionless blockchains (e.g., Bitcoin) are able to scale to a considerable number of nodes at the expense of attained throughput (e.g., Bitcoin can only achieve few transactions per second). On the other hand, permissionbased blockchains can achieve relatively higher throughput, but can only scale to few hundred nodes. However, one needs to cater for both performance and scalability to meet industrial standards. Privacy of lightweight clients. Most open blockchain platforms support lightweight clients, targeted for devices like smartphones, that only download and verify a small part of the chain. Here, clients connect to a full node that has access to the complete blockchain and can assist the client in transaction confirmation. As the full node has to learn all transactions issued and received by the requesting client to verify their correctness, such action obviously violates user privacy. In this talk, we plan to overview a number of security challenges pertaining to existing blockchains - effectively capturing almost 8 years of research in this area of work. Moreover, we plan to discuss the performance limitations of existing blockchain - based consensus algorithms and explore different concepts leveraging trusted execution environments (TEEs) to enhance the scalability and security of existing consensus algorithms. Finally, we will discuss the privacy provisions of existing lightweight client implementations and explore the solution space to enhance user privacy by leveraging functionality from TEEs.

Session Chair

Shweta Shinde

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