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Hanyang University announced on May 22 that Professor Kim Mi-ran's research team of Hanyang University's Department of Mathematics recently developed a source technology for accelerating homomorphic encryption.

Homomorphic encryption is a cryptographic technique that enables the calculation of arithmetic operations or polynomial calculations of original data without decryption in an encrypted state. Because data can be processed in an encrypted state, source information is not exposed, thus it is considered as a next-generation encryption that can solve security problems that arise throughout the data industry.

In the case of the homomorphic encryption (Cheon-Kim-Kim-Song scheme), which supports real number computations developed by Professor Kim Mi-ran's team in 2017, it is already attracting global attention as it is used in various fields such as statistical analysis, data search, and machine learning. However, the homomorphic encryption scheme is hard to be commercialized due to its high multiplication operation complexity and slow speed.

To solve this problem, Professor Kim's team decomposed large ciphertexts into relatively small elements and expressed basic homomorphic operations with relatively fast operations on the converted ciphertext. Accordingly, homomorphic cryptographic multiplication can be processed with linear time operation, which can greatly improve the operation speed.

In recognition of the originality and excellence of the technology, this study won a silver award in the field of Computer Science & Engineering at the “29th Samsung Humantech Paper Awards” which was recently held.

The technology can be applied to all existing homomorphic cryptography schemes. In addition, it can be said that it has taken a step closer to commercialization as it is possible to accelerate the basic operations of homomorphic cryptography. It is also expected to open a new horizon for hardware accelerator-based homomorphic cryptography research because it can be expressed in operations that are easy to implement in a hardware base. Professor Kim said, "Various applications, such as big data analysis, autonomous vehicles, and the Internet of Things, are expected to become a reality with homomorphic encryption acceleration technology."

This study was conducted with the support of the Samsung Science and  Technology Foundation, and the project will be presented at “Crypto”, the best international society in the field of cryptography.