活动类别：网络信息安全系列学术报告

活动时间：2020年9月14日 15:30-18:00

活动地点：腾讯会议(ID：922 669 805)

活动组织：太阳集团tcy8722网站 网络信息安全团队 

报告信息                                                                                        

报告题目：PKE-MET: Public-Key Encryption with Multi-Ciphertext Equality Test in Cloud Computing

报告人：Willy Susilo 教授  University of Wollongong, Australia

摘要：Cloud computing enables users to remove the necessity of the need of local hardware architecture, which removes the burden of the users from high computation costs. Therefore, it has attracted much attention and research has been conducted heavily on it. To protect users’ privacy, data is usually encrypted prior to being sent to the cloud server. As the resulting system is unusable, since the cloud can no longer search throughout the data, new cryptographic primitive such as public-key encryption with equality test (PKEET) has been introduced. In PKEET, users can test whether the underlying messages of two ciphertexts encrypted under different public keys are equal or not without the need to decrypt those ciphertexts. This is a very useful tool, especially for the cloud database, since PKEET mainly focuses on the equality test between two ciphertexts. However, in practice, the cloud server may need to verify the equivalence among more than two ciphertexts. This leads to disclosing unnecessary information of users and redundant computation cost will also occur when using traditional PKEET schemes. How to make this more efficient and practical remains an interesting research problem. In this paper, to solve the aforementioned problems by providing a novel concept of public-key encryption with multi-ciphertext equality test (PKE-MET). In PKE-MET, each ciphertext can designate a number s such that the cloud server can only perform equality test on this ciphertext with other s 􀀀 1 ciphertexts, where all their designated numbers are s. For PKE-MET, besides traditional OW-CPA and IND-CPA security, we specially define Number security. We instantiate PKE-MET to a concrete scheme and give its security proof.

报告人：Willy Susilo is a Senior Professor in the School of Computing and Information Technology, Faculty of Engineering and Information Sciences at the University of Wollongong (UOW), Australia. He is the director of Institute of Cybersecurity and Cryptology, School of Computing and Information Technology, UOW and the Head of School of Computing and Information Technology at UOW (2015-now). Prior to this role, he was awarded the prestigious Australian Research Council Future Fellowship in 2009. In 2016, he was awarded the “Researcher of the Year at UOW, due to his research excellence and contributions. He is the Editor-in-Chief of the Elsevier’s Computers Standards and Interface and the MDPI’s Information journal. He is currently an Associate Editor of IEEE Transactions on Dependable and Secure Computing. He has also served as the program committee member of several international conferences. His h-index is 66.