Industry-academic Cooperation Foundation, Chosun University

Seoul National University

Samsung Electronics Co., Ltd.

Sk Telecom Company, Ltd.

Snur & Db Foundation

Joon Woo Lee

Young Sik Kim

Jong Seon No

Yong Woo Lee

Kyung Min Kim

Eunsang Lee

Dong Won Na

Bong Su Um

Jae Hyung Huh

In a client-server model for generating a rotation operation key in fully homomorphic encryption, a client transmits a public key and a hierarchical Galois key generated using a secret key to a server, and the server performs a rotation operation on the public key using the hierarchical Galois key to directly generate one or more rotation operation keys, so that the server may generate a rotation operation key if necessary while computational burden and communication cost of the client are reduced.

Electronic device for delegating generation of homomorphic rotation key to server and method of operating the same

A homomorphic encryption operation key management system receives a public key and a hierarchical Galois key from a client device, verifies validity of a token in response to receiving the token and a request for a homomorphic encryption operation key for the client device from a server, and generates the homomorphic encryption operation key using the public key and the hierarchical Galois key and transmits the homomorphic encryption operation key to the server when the token is valid.

Key management system for homomorphic encryption operation and method of operating the same

An encryption method and apparatus based on homomorphic encryption using a composition of functions. The encryption method includes generating a ciphertext by encrypting data, and bootstrapping the ciphertext by performing a modular reduction based on a composition of a function for a modulus corresponding to the ciphertext.

Encryption method and apparatus based on homomorphic encryption using composition of functions

A method and apparatus for processing a ciphertext based on homomorphic encryption. The method includes determining an approximate polynomial corresponding to a modulus reduction for bootstrapping a ciphertext based on samples extracted from the modulus reduction, and bootstrapping the ciphertext based on the approximate polynomial.

Method and apparatus for processing ciphertext based on homomorphic encryption

Provided are an electronic device for sorting homomorphic ciphertext by using shell sorting and an operating method thereof to sort ciphertext generated by using homomorphic encryption according to a size of an original number corresponding thereto.

Electronic device for sorting homomorphic ciphertext using shell sorting and operating method thereof

The present invention relates to a method and system for providing voice-based supplementary information service using road map data. The voice-based supplementary information service system includes a content registration server for receiving content for the voice-based supplementary information service, and converting the content into supplementary information data having voice data format. At least one GPS satellite detects a location of the mobile communication terminal and transmits GPS radio waves, including the location information. A mobile communication terminal receives the location information and requests the road guidance service and the supplementary information service. A relay server relays requests for the road guidance service and the supplementary information service. A road search server generates road map data and transmits the road map data to the relay server. A user management server determines whether the request for the supplementary information service exists in the road map data. An information provision server verifies the type of supplementary information service, receives supplementary information data corresponding to the type from the content registration server, and generates supplementary information-added data in which the supplementary information data is included in a data area of the road map data.

Growing community of inventors

Seoul, South Korea

Joon Woo Lee