報告題目：PKE-MET: Public-Key Encryption with Multi-Ciphertext Equality Test in Cloud Computing
報 告 人：Willy Susilo 教授
報告地點：騰訊會議 （ID：505 828 655）
摘 要： Cloud computing enables users to remove the necessity of the need of local hardware architecture. 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. 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.
This paper solved 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 such that the cloud server can only perform equality test on this ciphertext with other ciphertexts, where all their designated numbers are s. For PKE-MET, besides traditional OW-CPA and IND-CPA security, we specially define Number security.
報告人簡介：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). 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 TDSC. He has also served as the program committee member of several international conferences.