Jiangshan Yu

Women in Engineering: Continuing (Tenure-Track) Academic Positions for Women, Faculty of Engineering, The University of Sydney Join a growing Faculty and be part of a University that places amongst the world’s best teaching and research institutions Located in the heart of Sydney’s bustling inner west quarter, close to beache...

📢 We are hiring! The School of #ComputerScience of #USyd 🇦🇺 is seeking outstanding women academics, at all seniority levels, for continuing (equivalent tenure system) positions.

Deadline to apply: ⏰ August 25 #AcademicJobs #WomenInCS

usyd.wd105.myworkdayjobs.com/en-GB/USYD_E...

🚨🚨📣 We now have a Sydney Blockchain Centre led by @jiangshanyu.github.io . It consists of experts from our School on various topics ranging from #distributed #computing, #consensus, #formalverification, to #security and #cryptography. Check out: usyd-desci.github.io/index.html
#Blockchain #USyd

Check out our Blockchain Research Centre at @sydneycompsci.bsky.social‬!

usyd-desci.github.io/index.html

We also launched the Decentralised Science Seminar Series, discussing cutting-edge research.

We’re open to collaborations -- just drop me a message for a coffee chat -- virtual if needed.

This could have a variety of applications in Central Bank Digital Currency (our work was motivated by the architecture proposed by the Bank for International Settlements and the Hong Kong Monetary Authority), trusted hardware–based wallets, and beyond.

Our CCS’25 paper introduces the concept of posterior security, enabling anonymity and message hiding for an already generated standard signature, even by someone who has no access to the signing key.

Now available online: eprint.iacr.org/2025/855.pdf

We propose Mosaic: client-side, local shard decisions, 20,000× faster, 228B input vs GBs, 95% throughput retained.

SOTA schemes like TxAllo (ICDE’23) use miner-driven global optimisation, requiring miners to sync the full ledger — aiming to cut costly cross-shard txs, but undermining sharded state’s goal of scalable performance.

Joint work with my PhD student Yuanzhe Zhang and colleague Shirui Pan (Griffith Uni), towards practical sharding in blockchains.

We close both gaps:
• Constant latency (3Δ) in the sleepy model
• Graded Common Prefix (GCP): generic DAG finality in 2 steps (vs 4 in BFT)
• adding flexibility via extended Ebb-and-Flow

SOTA DAG protocols fall into two camps:
• Prioritise liveness: support dynamic availability, but with non-constant latency
• Prioritise safety: rely on protocol-specific BFT for finality

Joint work also with my former student Runchao Han (Babylon Lab) and colleague Ron Steinfeld (Monash Uni)

Achilles:
• Removes rollback prevention from the critical path
• Matches CFT protocols in latency (4 steps) & linear message complexity
• Delivers state-of-the-art performance among TEE-assisted BFT protocols

SOTA TEE-assisted BFT faces a trade-off:
• High performance (e.g. FlexiBFT) reduces fault tolerance
• Strong tolerance (e.g. Damysus) may suffer from rollback issues (e.g. if using SGX)

Building on our Damysus and OneShot protocols (EuroSys’22, IPDPS’24), Achilles takes a key first step toward resolving rollback issues in
TEE-powered hybrid BFT systems.