To address the information security problems arising from the use of smart phones or tablet computers for accessing the Internet and cloud storage, Prof. Lee Pak-ching, Patrick, assistant professor, Department of Computer Science and Engineering at CUHK, has developed three innovative technologies for mobile cloud computing with many advantages, including encryption, safety, high speed, economy and reliability.

The first technology developed by Professor Lee is a practical proxy system that protects outsourced data by ensuring confidentiality, integrity, access control and assured deletion. It is also compatible with today’s cloud storage infrastructure, creating an unprecedented value-added security service to the emerging cloud storage technology.

Another technology helps service providers to reduce the number of servers deployed and end-users to save the time and cost of data transmissions. It can save 90% of storage space in archiving storage servers. With this technology, SMEs can be benefited by reducing the number of servers deployed. It also helps save energy and protect the environment in the long run.

Apart from ensuring information security of mobile cloud computing, saving cost and energy, and protecting our environment, CUHK is also concerned about the reliability of data storage. Professor Lee has thus developed a system which uses network coding-based storage schemes to divide a file into different blocks and store the blocks over different cloud storage nodes. It can save the cost incurred in data migration over clouds, while maintaining the same fault tolerance as in existing storage schemes.

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