Preprints

Multiparty Delegated Private Set Union with Efficient Updates on Outsourced Datasets

accepted in an upcoming issue of the TDSC (DOI: 10.1109/TDSC.2024.3419576)

(with Heewon Chung and Patrick Chulsoon Yang)

Computational Improvements to the ADS-based Verifiable Set Operations

a submission to IEEE TDSC

(with Heewon Chung)

Research publications

Taming the round efficiency of cryptographic protocols for private web search schemes (pdf)

Information Sciences 612: 1-21, 2023

(with Injae Lee)

A Key Recovery Protocol for Multiparty Threshold ECDSA Schemes (pdf)

IEEE Access 10: 133206--133218, 2022

(with Sangrae Cho and Seongbong Choi and Young-Seob Cho and Soohyung Kim and Hyung Tae Lee)

Bulletproofs+: Shorter Proofs for a Privacy-Enhanced Distributed Ledger (pdf)

IEEE Access 10: 42067-42082, 2022

(with Heewon Chung, Kyoohyung Han and Chanyang Ju and Jae Hong Seo)

Toward Round-Efficient Verifiable Re-Encryption Mix-Net (pdf)

IEEE Access 10: 91397--91413

Homomorphic comparison for point numbers with user-controllable precision and its applications (pdf)

Symmetry 12(5): 788-810, 2020

(with Heewon Chung, Ahmad Al Badawi, Khin Mi Mi Aung, and Bharadwaj Veeravalli)

Search condition-hiding query evaluation on encrypted databases (pdf)

IEEE Access 7: 161283-161295, 2019

(with Hyung Tae Lee, San Ling, Shu Qin Ren, Benjamin Tan, and Huaxiong Wang)

Experimenting With Non-Interactive Range Proofs Based on the Strong RSA Assumption (pdf)

IEEE Access 7: 117505-117516, 2019

(with Hyung Tae Lee)

Private Compound Wildcard Queries using Fully Homomorphic Encryption (pdf)

Accepted at IEEE Trans. on Dependable and Secure Computing, 2017

(with Hyung Tae Lee and San Ling and Benjamin Hong Meng Tan and Huaxiong Wang)

Encoding of Rational Numbers and Their Homomorphic Computations for FHE-based Applications (pdf)

International Journal of Foundations of Computer Science, 2018, 29(6): 1023-1044

(with Heewon Chung)

An Experimental Study of Encrypted Polynomial Arithmetics for Private Set Operations (pdf)

Journal of Communications and Networks, 2017, 19(5):431-441.

(with Benjamin Z. Kim)

Private Over-threshold Aggregation Protocols over Distributed Datasets (pdf)

IEEE Trans. on Knowledge and Data Engineering, 2016, 28(9):2467-2479.

(with Abedelaziz Mohaisen and Jung Hee Cheon and Yongdae Kim)

Optimized Search-and-Compute Circuits and Their Application to Query Evaluation on Encrypted Data (pdf)

IEEE Trans. Information Forensics and Security, 2016, 11(1):188-199.

(with Jung Hee Cheon and Miran Kim)

On the Efficiency of FHE-based Private Queries (pdf)

Accepted at IEEE Trans. Dependable and Secure Computing, and Cryptology ePrint Archive 2015:1176.

(with Hyung Tae Lee and San Ling and Huaxiong Wang)

Search-and-Compute on Encrypted Data (pdf)

Financial Cryptography Workshops 2015:142-159.

(with Jung Hee Cheon and Miran Kim)

Private Web Search with Constant Round Efficiency (pdf)

ICISSP 2015: 205-212.

This paper contained a serious error which is fixed in the draft of the full version (pdf).

(with Boram Kang and Seung Cheol Goh)

Secure Encounter-Based Mobile Social Networks: Requirements, Designs, and Tradeoffs (pdf)

IEEE Trans. on Dependable and Secure Computing, 2013, 10(6):380-393.

(with Abedelaziz Mohaisen and Denis Foo Kune and Eugene Y. Vasserman and Yongdae Kim)

Private Over-Threshold Aggregation Protocols (pdf)

In ICISC 2012: 472-486.

(with Abedelaziz Mohaisen and Jung Hee Cheon and Yongdae Kim)

Compress Multiple Ciphertexts Using ElGamal Encryption Schemes (pdf)

Journal of KMS, 2013, 50(2):361-377.

(with Jihye Kim and Jung Hee Cheon)

A Public Shuffle without Private Permutations

Cryptology ePrint Archive 2012:301.

(with Jinsu Kim and Jung Hee Cheon)

Privacy-preserving web search (pdf)

ICUFN 2012:480-481

(with Jihye Kim)

Mutual Private Set Intersection with Linear Complexity (pdf)

In WISA 2011: 219-231.

(with Hyung Tae Lee and Jung Hee Cheon)

A secure smart-metering protocol over power-line communication (pdf)

IEEE Tran. on Power Delivery, 2011, 26(4):2370-2379.

(with Sungwook Kim and Eun Young Kwon and Jung Hee Cheon and Seong-ho Ju and Young-hoon Lim and and Moon-seok Choi)

Presentations

Crypto-Research Project supervised by KIISC

1st Workshop, May 2015. (pdf)

2nd Workshop, Sep. 2016. (pdf)

Other writings

1. Patents

Method and apparatus for efficiently encrypting/decrypting digital content according to broadcast encryption scheme

US9015077 (with Bongseon Kim and Sunghyu Han and Youngsun Yoon and Sunnam Lee and Jaeheung Lee)

Key management method using hierarchical node topology, and method of registering and deregistering user using the same

US8983071 (with Sunghyu Han and Bongseon Kim and Youngsun Yoon and Sunnam Lee and and Jaeheung Lee)

Obfuscation method for process of encrypting/decrypting block cipher using boolean function expression and apparatus for the same

KR1012812750000 (with Jung Hee Cheon)

Method and apparatus for managing digital content

US8474055 (with uhee Seo and Haksoo Ju and Jiyoung Moon and Mihwa Park)

System and method for building home domain using smart card which contains information of home network member device

US8347076 (with Jaeheung Lee and Suhyun Nam and Yongjin Jang and and Yanglim Choi)

Method of controlling content access and method of obtaining content key using the same

US8341402 (with Sunghyu Han and Youngsun Yoon and Sunnam Lee and Bongseon Kim and Jaeheung Lee)

Method and devices for reproducing encrypted content and approving reproduction

US8321660 (with Haksoo Ju and Jiyoung Moon)

Method of packaging broadcast contents

US8301571 (with Sunghyu Han and Youngsun Yoon and Jaeheung Lee and Bongseon Kim and Moonyoung Choi)

Method for transmitting content in home network using user-binding

US8234493 (with Sunghyu Han and Yongkuk You and Youngsun Yoon and Bongseon Kim and Jaeheung Lee)

Key management method for home network and home network device and system using the same

US8170215 (with Sunnam Lee and Suhyun Nam and Sangsu Choi and Sunghyu Han)

Method and apparatus for managing digital content

US8161296 (with Yoon Youngsun and Lee Sunnam and Kim Bongseon and Lee Jaeheung and Han Sunghyu)

Method and apparatus for backing up and restoring domain information

US8156344 (with Bongseon Kim and Sunghyu Han and Youngsun Yoon and Sunnam Lee and Jaeheung Lee)

Method and apparatus for checking proximity between devices using hash chain

US8122487 (with Jaeheung Lee and Sunghyu Han and Youngsun Yoon and Sunnam Lee and Bongseon Kim)

Home network system and method therefor

US7979913 (with Yongjin Jang and Suhyun Nam and Jaeheung Lee)

Scrambling apparatus and method using conversion of motion vector information of video data

US7826615 (with Suhyun Nam and Yongjin Jang and Sunnam Lee and Jaeheung Lee and Sangsu Choi)

2. Miscellany