About me

I am a Senior Researcher in the Cryptography Research Group at Microsoft Research, Redmond. My research focus is on security, privacy, and advanced cryptography. Currently I am very interested in design, optimization, and applications of Homomorphic Encryption.

I obtained my B.S. and Ph.D. degrees in mathematical sciences from Seoul National University, Korea, in 2012 and 2018, respectively. My advisor was Prof. Jung Hee Cheon. I have been a postdoctoral researcher hosted by Prof. Sicun Gao at UC San Diego prior to joining Microsoft.

I am inventor of the CKKS homomorphic encryption scheme, which supports approximate fixed-point arithmetic. The first implementation HEAAN from SNU came out in 2017. An implementation of its RNS variant (with some minor changes from the paper) is publicly available in Microsoft SEAL under MIT license.