Industry-Academic Cooperation Foundation, Chosun University

Snu Rdb Foundation

Samsung Electronics Co., Ltd.

Hyundai Motor Company

Seoul National University

Kia Motors Corporation

Kia Motor Corporation

Jong Seon No

Jun Jin Kong

Jae Hong Kim

Young-Sik Kim

Young Sik Kim

Joon Woo Lee

Hyun Soo Ahn

Jun Young Woo

Yong Woo Lee

Chung Hi Lee

Ho Youn Kim

Byoung Wook Lee

Young Sik Moon

Kyoung Lae Cho

Yong June Kim

Ho Jin Jung

Chang Soo Park

Yongwoo Lee

Kang Seok Lee

Beom Kyu Shin

Jae Yoel Kim

Ho Ryong Yoo

Hee Won Kang

Jae Dong Yang

Seok Il Youn

Kyeong Cheol Yang

Eunsang Lee

Hyun Cheol Bae

Chang Min Cho

Jae Min Ahn

Young Ky Kim

Joonwoo Lee

Ji Youp Kim

Wi Jik Lee

Jong Yoon Yoon

Ha Bong Chung

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

Provided is an electronic signature technique depending on a diametrically different algorithm from the existing asymmetric key infrastructure electronic signature technique which generates predetermined syndrome data based on a message to be transmitted a data receiving device and then detects an error vector for an electronic signature from the syndrome data by using a parity check matrix and then generates an electronic signature value based on an error vector for the electronic signature and transmits the generated electronic signature value to the data receiving device.

Electronic device capable of data communication through electronic signatures based on syndrome and operating method thereof

A method of performing cross-authentication in a vehicle controller interworking with an external device includes: generating a random number S and transmitting the random number S to the external device according to an authentication request message received from the external device; generating a variable i using a first function having the random number S as a parameter; generating a first session key Ks using a second function having the variable i and a pre-stored secret key K as parameters; receiving a first response key from the external device; generating a second response key using a third function having the random number S, the variable i and the first session key Ks as parameters; and authenticating the external device based on whether the first response key is equal to the second response key.

Method and apparatus for performing cross-authentication based on secret information

A method and apparatus for authenticating packets in a controller area network (CAN) are disclosed. The method includes transmitting messages using a mixture of message authentication codes (MACs) in a controller area network (CAN). In addition, a first MAC is generated using a first message and the first MAC is divided into a first MAC part and a second MAC part. A second MAC is generated using a second message and the second MAC is divided into a third MAC part and a fourth MAC part. A linear operation is performed between the second MAC part and the third MAC part to generate a first authentication MAC. The first message is transmitted with the first MAC part and the second message is transmitted with the first authentication MAC.

Method of authenticating can packets using mixture of MACs and apparatus for implementing the same

A method of transmitting K messages using divided message authentication codes (MACs) in a controller area network (CAN) includes: generating a MAC using a first message and a specific MAC, performing a first operation with respect to j using j-th messages subsequent to the first message and a second MAC part of the generated MAC, performing a second operation with respect to j using a result of the performed first operation and a j-th subblock subsequent to a first MAC subblock among K MAC subblocks obtained by dividing a first MAC part of the generated MAC, transmitting the first message along with the first MAC subblock, and transmitting K-1 j-th messages in an order of j, each of the j-th messages being transmitted along with a j-th result of the performed second operation.

Method of sequentially authenticating CAN packets using divided MACS and apparatus for implementing the same

An apparatus for detecting an in-vehicle network attack, is configured to cumulatively count packets for each device that has a respective ID and is connected to an in-vehicle network bus. The apparatus is configured to cumulate a check value every time the packets are cumulatively counted to calculate a cumulated value, and determine that an attack is conducted when an average cumulated value obtained by dividing the cumulated value by a cumulative counted value does not exceed a first threshold value.

Apparatus and method for detecting in-vehicle network attack

An iterative decoding method is disclosed and includes sequentially executing a number of iterative decoding cycles in relation to a parity check equation until the parity check equation is resolved, or a maximum number N of iterative decoding cycles is reached, during execution of the number of iterative decoding cycles, storing in a data buffer minimum estimated values for a set of variable nodes corresponding to a minimum number of bit errors, and outputting the minimum estimated values stored in the data buffer as a final decoding result when the number of iterative decoding cycles reaches N.

Iterative decoding method and apparatus

A decoder includes multiple decoder stages and a controller. The decoder stages perform decoding operations with respect to a received signal using corresponding different decoding algorithms. The controller determines whether the decoding operation performed by one of the decoder stages with respect to the received signal is successful, and controls the decoding operation of each of the other decoder stages in response to a result of the determination.

Hierarchical decoding apparatus

Growing community of inventors

Seoul, South Korea

Jong Seon No