Samsung Electronics Co., Ltd.

Seoul National University

Industry-academic Cooperation Foundation, Chosun University

Snu Rdb Foundation

Electronics and Telecommunications Research Institute

Hyundai Motor Company

Kia Motors Corporation

Dongguk University Industry-academic Cooperation Foundation

Jong-Seon No

Young-Sik Kim

Hee-Won Kang

Kyeong-Cheol Yang

Jun-Jin Kong

Jae-Yoel Kim

Young-Ky Kim

Jae-min Ahn

Chang-soo Park

Yongwoo Lee

Ha-Bong Chung

Soon-Young Yoon

Yong-June Kim

Dong-Joon Shin

Joon-woo Lee

Sunghwan Kim

Jae-Young Ahn

Sang-Hyun Lee

Je-Woo Kim

Yun-Hee Kim

Eunsang Lee

Jae-Min Ahn

Hong-Yeop Song

Xianglan Jin

Seho Myung

Jae-Hong Kim

Jae-Won Kim

Young-Hwan Lee

Kwang-Wook Lee

Sinjung Kim

Jae-Yeol Kim

Seung-Hyun Kong

Ho-Youn Kim

Eun-Sang Lee

Hosung Park

Seok-Joong Heo

Dae Woon Lim

Joonwoo Lee

Beomkyu Shin

Seokbeom Hong

Beom-kyu Shin

Wijik Lee

Ho-sung Park

Pilwoong Yang

Wi-Jik Lee

Hyung Suk Noh

Chang-Min Cho

Jun-Woo Tak

Hee-Woon Kang

Hyungchul Kang

Dong Joon Shin

Yong-Woo Lee

Seung-Jae Chae

Jae-Dong Yang

A method of performing a homomorphic permutation by a server includes: generating, via a ciphertext generation portion, a first ciphertext by adding noise to the basic ciphertext; transmitting, via a transmission portion, the first ciphertext to a client; performing, via an operation portion, a predetermined operation on the noise; receiving, via a reception portion, a second ciphertext from the client; and extracting, via an extraction portion, the basic ciphertext on which the predetermined operation is performed, by removing, from the second ciphertext, the noise on which the predetermined operation is performed, wherein the second ciphertext is a ciphertext that is re-encrypted by the client after decrypting the first ciphertext and performing the predetermined operation on the decrypted first ciphertext.

Method and device for performing homomorphic permutation

A processor-implemented method with homomorphic encryption includes: receiving a first ciphertext corresponding to a first modulus; generating a second ciphertext corresponding to a second modulus by performing modulus raising on the first ciphertext; and performing bootstrapping by encoding the second ciphertext using a commutative property and an associative property of operations included in a rotation operation.

Method and apparatus with homomorphic encryption

Disclosed is an encryption method and apparatus. The encryption method using homomorphic encryption may include generating a ciphertext by encrypting data, and bootstrapping the ciphertext by performing a modular reduction based on a selection of one or more target points for a modulus corresponding to the ciphertext.

Encryption method and apparatus using homomorphic encryption

Disclosed is an electronic apparatus. The electronic apparatus includes a memory storing a composite function in which at least two polynomials are composed and a processor configured to, based on a comparison operation command being received for a plurality of homomorphic ciphertexts, perform operation by reflecting the plurality of homomorphic ciphertexts to the composite function, and obtain a comparison result of the plurality of homomorphic ciphertexts based on the operation result, each of the at least two polynomials may output a value in a preset range for a value in a preset domain, and a domain of one of the at least two polynomials may be determined based on a range of a previous polynomial.

Electronic apparatus, control method thereof and server

A processor-implemented encryption method using homomorphic encryption includes: receiving data; generating a ciphertext by encrypting the received data; determining a coefficient of an approximating polynomial for performing a modular reduction on a modulus corresponding to the ciphertext, based on an error between the approximating polynomial and a modular reduction function; and performing bootstrapping on the ciphertext by performing the modular reduction based on the determined coefficient of the approximating polynomial.

Method and apparatus with encryption based on error variance in homomorphic encryption

The present disclosure relates to a pre-5-Generation (5G) or 5G communication system to be provided for supporting higher data rates Beyond 4-Generation (4G) communication system such as Long Term Evolution (LTE). A method of decoding a signal in a communication system includes receiving an encoded bit-stream corresponding to message bits and first Cyclic Redundancy Check (CRC) bits, obtaining a codeword through a traceback for at least part of the encoded bit-stream, generating second CRC bits by performing CRC encoding on the codeword, and performing decoding based on at least part of the second CRC bits.

Apparatus and method for decoding signal in wireless communication system

Disclosed are a data encryption apparatus and a data encryption method using an encryption key based on puncturing of a generator matrix. Bit values located in a column at a specific point are punctured from a generator matrix of a Reed-Muller (RM) code and thereafter, encryption of a message is performed through a public key generated by using the punctured generator matrix to defend an attack from a third party based on a structure of the RM code by change of the structure of the generator matrix, thereby solving security vulnerability caused as the existing McEliece encryption system uses the generator matrix of the RM code having a special structure as it is.

Data encryption apparatus and method using an encryption key based on puncturing of a generator matrix

A vehicle includes a low frequency (LF) transmitter, a high frequency receiver, and a control unit. The low frequency (LF) transmitter may be configured to transmit a LF signal in order to search for a remote control device. The high frequency receiver may be configured to receive a signal having a predetermined frequency band which is greater than a frequency band of the LF signal transmitted by the LF transmitter. The control unit may be configured to determine that a relay attack is generated when the signal received by the high frequency receiver is a modulated LF signal.

Vehicle and method of controlling the same

The present disclosure relates to a pre-5-Generation (5G) or 5G communication system to be provided for supporting higher data rates Beyond 4-Generation (4G) communication system such as Long Term Evolution (LTE). An operation method of a reception node in a wireless communication system includes: receiving first signals including a signal received through a first channel, which is a channel between at least one transmission node belonging to a cell of the reception node and the reception node, and a signal received through a second channel, which is a channel between at least one transmission node belonging to a neighbor cell and the reception node during a first time interval; receiving a second signal, to which beamforming for removing a signal from at least one transmission node belonging to the neighbor cell is applied, from a relay station through a channel between the relay station and the reception node; and decoding a third signal acquired by adding the first signal and the second signal.

Apparatus and method for interference alignment in wireless communication system

Disclosed is a method for selecting a source transmit antenna in a cooperative multiple-input and multiple-output (MIMO) communication system including a source node, a relay node and a destination node. The method includes determining a source transmit antenna selection metric such that a source-destination channel, a source-relay channel and a relay-destination channel are related to one another, and selecting a positive integer number of antennas such that the source transmit antenna selection metric is maximized.

Method for selecting source transmit antenna in cooperative MIMO communication system

The present invention relates to a source antenna switching scheme for a non-orthogonal protocol; and more particularly, to a source antenna switching scheme for a non-orthogonal protocol, which transmits a signal of a source node to a destination node through a relay node. The present invention provides a source antenna switching scheme for a non-orthogonal decode-and-forward protocol that can acquire a greater diversity than the conventional NDF protocol. In other words, the present invention provides a source antenna switching scheme for a non-orthogonal decode-and-forward protocol that can increase a diversity order by adding a reasonable priced antenna instead of expensive hardware such as an RF chain when there are a plurality of antenna in the RF chain.

Source antenna switching scheme for non-orthogonal protocol

Disclosed is a decoding apparatus for LDPC (Low-Density Parity-Check) codes when receiving data encoded with LDPC codes on a channel having consecutive output values, and a method thereof. The decoding method for LDPC codes uses sequential decoding and includes the following steps: (a) the nodes are divided according to a parity-check matrix into check nodes for a parity-check message and variable nodes for a bit message; (b) the check nodes are divided into a predetermined number of subsets; (c) the LDPC codeword of each subset for all the check nodes is sequentially decoded; (d) an output message is generated for verifying validity of the decoding result; and (e) the steps (b), (c), and (d) are iteratively performed by a predetermined number of iterations.

Decoding apparatus for low-density parity-check codes using sequential decoding, and method thereof

A method for a decoding device to decode a codeword matrix of a product code includes: generating a first extended parity check matrix for a vertical code; decoding a horizontal codeword of a plurality of rows in the codeword matrix to thus perform a first decoding process; generating a second extended parity check matrix by removing a column corresponding to a row of the first decoding-succeeded horizontal codeword from the first extended parity check matrix; and decoding the first decoding-failed horizontal codeword by using the second extended parity check matrix to thus perform a second decoding process. Therefore, the simple and reliable product code decoding method is provided.

Product code decoding method and device

A decoding method includes performing a first decoding method and performing a second decoding method when decoding of the first decoding method fails. The first decoding method includes updating multiple variable nodes and multiple check nodes using probability values of received data. The second decoding method includes selecting at least one variable node from among the multiple variable nodes; correcting probability values of data received in the selected at least one variable node; updating the variable nodes and the check nodes using the corrected probability values; and determining whether decoding of the second decoding method is successful.

Decoding method and memory system device using the same

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Seoul, South Korea

Jong-Seon No