Recently, Chinese Association for Cryptologic Research (CACR) announced the recipients of the 2023 Outstanding Ph.D. Dissertation Award, three PhD graduates from the CS Department of Shanghai Jiao Tong University won this award. The awarded dissertations include Liu Xiangyu's 'Cryptographic Algorithms And Protocols with Tight Security', Liu Hanlin's 'Research on the Hardness of Learning Parity with Noise', and Jia Yanxue's 'Research on Key Privacy-Preserving Techniques for Blockchain'.

Liu Xiangyu, a 2019 Ph.D. graduate from the Computer Science Department, completed his degree in March 2023 under the guidance of Prof. Liu Shengli. His dissertation focused on tight security proofs, leading to the design of several cryptographic algorithms and protocols with tight security. The thesis proposed 2-Pass AKE protocol with explicit authentication and tight security for the first time and showed concrete constructions in both the random oracle model and the standard model. It also proposed tightly secure PAKE protocol from the CDH assumption under the UC model for the first time. It presented NIZK scheme with fine-grained verifiability with two instantiations and the first tightly mCCA-secure IPFE scheme.His research findings were published in conferences and journals such as ASIACRYPT, PKC, and Theoretical Computer Science.

Liu Hanlin, a 2018 Ph.D. graduate from the Computer Science Department, completed his degree in March 2023 under the guidance of Prof. Yu Yu. His dissertation delved into the hardness of LPN, focusing on the hardness of generic decoding of random linear codes and its variant problem. The thesis effectively optimized the existing sublinear time attack methods and providing secure reduction proofs for problems like Learning with Errors (LPN) over finite fields and the integer ring LPN problem. His research contributions were published in conferences and journals including CRYPTO, ASIACRYPT, CHES, and TCS.

Jia Yanxue, a 2018 Ph.D. graduate from the Computer Science Department, completed her degree in December 2022 under the guidance of Prof. Gu Dawu. Her dissertation addressed key privacy-preserving techniques for blockchain. It proposed a new efficient design framework for private set union and conducted systematic security analysis of typical PSU protocols under the Universal Composition (UC) framework. In regards to privacy-preserving payments, it proposed a theoretical model for aggregated transaction systems and constructed a series of novel cryptographic primitives like a new ElGamal encryption algorithm and a new one-out-of-many proof. His research results were presented at conferences and journals such as ASIACRYPT, USENIX Security, IEEE TDSC, and ASIACCS.

The Chinese Association for Cryptologic Research (CACR), established in 2007, is a national, academic, and non-profit organization formed voluntarily by professionals and institutions in cryptology and related fields. It is a 3A-level society approved by the Ministry of Civil Affairs and is under the leadership of the China Association for Science and Technology, affiliated with the National Cryptography Administration. It is one of the most influential technology societies in the area of cryptography in China.

Source：

https://www.cacrnet.org.cn/site/content/1405.html