1. 时间：2023年10月31日

2. 主讲人：徐明辉（山东大学计算机科学与技术学院预聘制助理教授，数链融合教育部工程研究中心副主任，山东省海外优青，2023年入选山东大学青年学者未来计划。2018年于北京师范大学物理系获得学士学位，2021年于美国乔治华盛顿大学计算机系获得博士学位，2023年访问瑞士苏黎世联邦理工大学。主要研究方向为区块链、分布式计算、应用密码学，近三年在INFOCOM、ICDCS、TMC、TC、JSAC、TPDS、TWC等国际顶级会议期刊发表论文20余篇，获得WASA2020最佳论文奖。担任Elsevier国际期刊《High-Confidence Computing》编委，曾任IEEE IPCCC、IEEE FNWF、IEEE ICMC、IEEE MASS分会主席。主持国家自然基金青年基金、国家自然科学基金重点项目课题、重点研发计划课题、CCF-华为胡杨林基金区块链专项等，参与重点研发计划青年科学家项目。获得Ethereum、Filecoin等多个国际黑客松大赛一等奖，主持开发SandyChain工业级区块链平台在智慧社区、融资租赁场景实现应用落地，产生经济效益700万元。）

3. 报告题目：FileDAG and FileDES: Decentralized Storage Networks on DAG-based Blockchains

4. 报告摘要：Decentralized Storage Networks (DSNs) can gather storage resources from mutually untrusted providers and form worldwide decentralized file systems. Compared to traditional storage networks, DSNs are built on top of blockchains, which can incentivize service providers to contribute their unused storage spaces and ensure strong security. However, pioneering DSNs still face challenges in many aspects such as data privacy, proof of storage complexity, multi-version file management, and file indexing. In this talk, we will report two of our recent works, namely FileDAG and FileDES, which intend to overcome the above problems in designing DSNs. Specifically, FileDAG is built on a DAG-based blockchain to support file-level deduplication in storing multi-versioned files while relying on a two-layer DAG-based blockchain ledger to provide flexible and storage-saving file indexing; FileDES (Decentralized Encrypted Storage) extends FileDAG from multiple aspects, incorporating data security, system scalability, and proof succinctness with file encryption, a lightweight proof of encrypted storage algorithm (PoES), and a succinct multi-version verification method. Open research challenges and future research directions will also be discussed.