Monash cyber security expert Dr Joseph Liu will present new innovations to data encryption protocols for enhanced yet simpler security processes.
Motivated by the recent searchable symmetric encryption protocol of Cash et al., we propose a new multi-client searchable symmetric encryption protocol in this work. By tactfully leveraging the RSA-function, our protocol avoids the per-query interaction between the data owner and the client, thus reducing the communication overhead significantly and eliminating the need of the data owner to provide the online services to clients at all times. Furthermore, our protocol manages to protect the query privacy of clients to some extent, meaning that our protocol hides the exact queries from the data owner. In terms of the leakage to server, it is exactly the same as Cash et al., thus achieving the same security against the adversarial server. In addition, by employing attribute-based encryption technique, our protocol also realises the fine-grained access control on the stored data. To be compatible with our RSA-based approach, we also present a deterministic and memory-efficient 'keyword to prime' hash function, which may be of independent interest.
About the speaker
Dr. Joseph Liu is a senior lecturer at the Faculty of Information Technology, Monash University, specialising in cyber security, protocols for securing wireless networks, privacy, authentication, and provable security. Previously he worked at the Institute for Infocomm Research (I2R) in Singapore for more than 7 years. His current technical focus is particularly cyber security in the cloud computing paradigm, big data, lightweight security, and privacy enhanced technology. He has published more than 120 referred journal and conference papers and received the Best Paper Award from ESORICS 2014 and ESORICS 2015. He is the co-founder of ProvSec (International Conference on Provable Security).
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