Update: ACNS 2021 will be a virtual conference. The SCI workshop will be held as a virtual workshop in June 23, 2021.

Workshop Program

• Session 1 (6:15-7:15 pm, Chair: Bo Luo): Keynote

Understanding and Demystifying Bitcoin Mixing Services

- Yajin Zhou (Zhejiang University, China)

• Session 2 (7:25-8:25 pm, Chair: Jingqiang Lin): Cryptographic Implementation

1. A (bit)slice of Rainbow

- Florian Caullery

2. PoliCT: Flexible Policy in Certificate Transparency Enabling Lightweight Self-Monitor

- Aozhuo Sun, Bingyu Li, Huiqing Wan and Qiongxiao Wang

3. Combating the OS-level Malware in Mobile Devices by Leveraging Isolation and Steganography

- Niusen Chen, Wen Xie and Bo Chen

• Session 3 (8:35-9:35 pm, Chair: Jun Shao): Applied Cryptography

1. Cryptanalysis of a Lattice-Based Group Signature with Verifier-Local Revocation Achieving Full Security

- Yanhua Zhang, Ximeng Liu, Yupu Hu, Qikun Zhang and Huiwen Jia

2. An Efficient Proactive Secret Sharing Scheme for Cloud Storage

- Shuihai Zhang, Yan Zhang, Jingfu Wang, Chunli Lvu and Bei Pei

3. Aggregate Signature with Traceability of Devices Dynamically Generating Invalid Signatures

- Ryu Ishii, Kyosuke Yamashita, Yusuke Sakai, Takahiro Matsuda, Tadanori Teruya, Goichiro Hanaoka, Kanta Matsuura and Tsutomu Matsumoto

Keynote: Understanding and Demystifying Bitcoin Mixing Services By: Dr. Yajin Zhou ZJU100 Young Professor Zhejiang University, China

Abstract: Mixing services that help enhance the anonymity of Bitcoin have been abused to facilitate criminal activities, e.g., money laundering. We take the first step to understand state-of-the-art Bitcoin mixing services. Specifically, we propose a generic abstraction model for mixing services and observe that there are two mixing mechanisms in the wild, i.e., swapping and obfuscating. Based on this model, we conduct a transaction-based analysis and successfully reveal the mixing mechanisms of four representative services. Besides, we propose a method to identify mixing transactions that leverage the obfuscating mechanism. The proposed approach is able to identify over 92% of the mixing transactions. Based on identified transactions, we then estimate the profit of mixing services and provide a case study of tracing the money flow of stolen Bitcoins. Our dataset has been released at https://github.com/blocksecteam/bitcoinmixing. Speaker BIO: Dr. Yajin Zhou is a ZJU100 Young Professor (since 2018), with both the College of Computer Science and Technology and the School of Cyber Space and Technology at Zhejiang University, China. He earned his Ph.D. (2015) in Computer Science from North Carolina State University and then worked as a senior security researcher at Qihoo 360. He has published more than 40 papers, with 7500+ citations (Google Scholar). His current research spans software security, operating systems security, hardware-assisted security and confidential computing. He is also interested in emerging areas, e.g., security of smart contracts, decentralized finance (DeFi) security, and underground economy. He has served in the program committed of pretentious security conferences, including IEEE S&P, CCS and USENIX Security. More information can be found on his personal website: https://yajin.org.

Accepted Papers

• #1 - A (bit)slice of Rainbow
• #2 - Cryptanalysis of a Lattice-Based Group Signature with Verifier-Local Revocation Achieving Full Security
• #4 - An Efficient Proactive Secret Sharing Scheme for Cloud Storage
• #5 - PoliCT: Flexible Policy in Certificate Transparency Enabling Lightweight Self-Monitor
• #6 - Aggregate Signature with Traceability of Devices Dynamically Generating Invalid Signatures
• #12 - Combating the OS-level Malware in Mobile Devices by Leveraging Isolation and Steganography

Note: Each accepted workshop paper needs one registration at full rate before 20 May, no matter student author or not. Please refer to ACNS 2021 registration link to finish this process.

SCI Workshop Call for Papers

In recent years, we have witnessed severe security incidences caused by buggy protocols or implementations of cryptographic algorithms: POODLE, DROWN, OpenSSL Heartbleed, Windows certificate validation vulnerabilities, PDF shadow attacks, Google Titan Token Bluetooth bugs, etc. It is critical for practitioners and researchers to ensure the security of cryptographic software and hardware, which are essential for a wide range of systems, services, and applications.

The aim of the SCI workshop is to provide an international forum of scientific research and development to explore the security issues in the implementation and deployment of cryptographic solutions. We are interested in these main aspects: (1) vulnerabilities and defenses in the implementation of cryptographic algorithms; (2) vulnerabilities and defenses in the implementation of cryptographic protocols; (3) defective cryptographic algorithms and protocols deployed in the wild; (3) weak cryptographic keys and random numbers in the cryptographic implementation; (4) runtime cryptographic key attacks and protections; (5) certificates and key management; (6) misuse or abuse of cryptographic services; and (7) other topics on secure cryptographic implementations.

We try to promote secure cryptographic solutions in the Internet, by exploring and discussing the (in)security issues. We solicitat submissions of original research papers on a wide range of topics, including but not limited to:

• Secure implementations of crypto algorithms & protocols
• Fuzzing and vulnerabilities of crypto algorithms & protocols
• Measurement of cryptographic solutions in the wild, defective or updated
• Designs of random bit generators
• Weak cryptographic keys and defective random bit generators
• Side channel attacks and defenses
• Cryptographic key protections and memory attacks
• PKI certificate services and key management
• HTTPS/TLS vulnerabilities and attacks
• Measurement and bugs of certificate-based solutions
• Audit and monitoring of cryptographic services
• Physical attacks and defenses of cryptographic implementation
• Verification and evaluation of cryptographic implementation
• High-performance cryptographic engines
• Cryptographic hardware
• Cryptography for Blockchain
• Cryptography for IoT/CPS
• Cryptography for the Cloud
• Cryptography for Mobile systems
• Cryptography for VANET

We are especially interested in papers with novel ideas, position papers, pilot studies, and initial findings. ACNS will also award the best papers from all accepted workshop papers. Meanwhile, the workshop will include an interesting keynote talk, which will be announced on the workshop web site as arrangements are finalized.

Prospective authors are invited to submit manuscripts describing original work. The manuscript has to be written in English and in PDF format. All submissions must follow the original LNCS format (see http://www.springeronline.com/lncs) with a page limit of 18 pages including all references and appendices.

The proceedings of the SCI workshop will be published by Springer in the LNCS series.

Submit your papers: https://easychair.org/conferences/?conf=acnssci2021

Program Committee

• Bo Chen Michigan Technological Univ., USA
• Fu Chen Central Univ. of Finance & Economics, CHINA
• Jiankuo Dong Nanjing University of Posts and Telecommunications, CHINA
• Johann Großschädl University of Luxembourg, Luxembourg
• Le Guan University of Georgia, USA
• Debiao He Wuhan University, CHINA
• Bingyu Li Beihang University, CHINA
• Fengjun Li University of Kansas, USA
• Di Ma ZDNS, CHINA
• Yuan Ma Chinese Academy of Sciences, CHINA
• Jun Shao Zhejiang Gongshang University, CHINA
• Ruisheng Shi Beijing University of Posts and Telecommunications, CHINA
• Zhiguo Wan Shandong University, CHINA
• Ding Wang Nankai University, CHINA
• Juan Wang Wuhan University, CHINA
• Wei Wang Chinese Academy of Sciences, CHINA
• Jun Xu Stevens Institute of Technology, USA
• Li Yang Xidian University, CHINA
• Fan Zhang Zhejiang University, CHINA
• Fangyu Zheng Chinese Academy of Sciences, CHINA

In Conjunction with
ACNS 2021

Important Dates:

Paper submission:
Extended to
April 5, 2021. 23:59, AoE

Acceptance Notification:
May 5, 2021

Workshop Chairs:

Dr. Jingqiang Lin
University of Science and Technology of China
linjq <at> ustc.edu.cn

Dr. Bo Luo
University of Kansas
bluo <at> ku.edu

Publication Chair

Jun Shao
Zhejiang Gongshang University

Publicity Co-chairs:

Le Guan
University of Georgia

Debiao He
Wuhan University

Past SCI Workshops

ACNS Workshop on SCI 2020