In the era of big data, we are now witnessing an explosion of data generated through social media, messaging, emails and more. To cope with Exabyte of such ever-increasing data volume in terms of storage, communication, and computation, technological service providers now usually resort to cloud computing for storage and service hosting, as it can provide economical and on-demand usage of abundant storage and computation resources. Despite the well-known prominent benefits, hosting data in the cloud deprives the data owner’s direct control and undesirably raises security concerns. For media data type, the threat is not merely about data confidentiality but also the fact that authorized users may become traitors and thus illegally rebroadcast the entire decrypted original content. Such a threat is amplified due to monetary profits or business conflict in real applications.
In this talk, we move one step further in bridging the gap of cryptography and digital watermarking to alleviate security vulnerabilities of cloud computing. In particular, it aims to design new techniques for privacy-preserving and copyright-protected media sharing services with public cloud computing resources. With an in-depth investigation of digital watermarking and encrypted-access control techniques, we customize two different proposals, with or without a trusted third party, for simultaneously solving privacy and copyright problems. Experimental results demonstrate the effectiveness of our proposals.
张愉博士于2016年获得香港城市大学电子系哲学博士学位。从2011到2017年间，他曾在City University of Hong Kong电子系、计算机系，University of Bologna，University of Ferrara, University of Macau，SUNY Buffalo等地进行学术研究。自2018年1月起，他担任Deakin University (Australia)信息科技系的助理教授。张愉博士的研究领域包括云安全，多媒体安全，对抗机器学习。张愉博士曾在IEEE Transactions on Multimedia, IEEE Transactions on Cybernetics, IEEE Transactions on Big Data, Information Sciences等期刊会议上发表论文30余篇,谷歌引用数为470余次。