• Proceedings of the Korea Information Processing Society Conference
• /
• 2022.05a
• /
• pp.505-508
• /
• 2022

딥러닝 기술이 발전하면서 적용되는 산업 분야가 늘어남에 따라 딥러닝 모델에서 역으로 학습 데이터를 추출하는 등 다양한 딥러닝 모델 공격 이슈가 발생하고 있다. 이러한 위협에 대응하기 위해 딥러닝 학습에 사용되는 데이터의 노출을 방지할 수 있도록 사용자 프라이버시를 보호하는 기법의 중요성이 대두되고 있다. 동형암호는 학습 데이터를 보호할 수 있는 기법 중 하나로, 복호화 과정없이 암호화된 상태로 연산, 탐색, 분석 등을 수행할 수 있는 차세대 암호 알고리즘이다. 본 논문에서는 동형암호 기반의 딥러닝 기법 연구 동향에 대해 알아본다.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2011.11a
• /
• pp.881-883
• /
• 2011

많은 사용자들이 자신의 데이터를 휴대하기 위해 이동형 저장매체를 이용하고 있다. 하지만 이와 같은 이동형 저장매체는 분실 위험이 있으며, 휴대하지 않았을 경우 데이터에 접근하지 못한다는 불편함을 가지고 있다. 통신기술의 발달로 언제어디서나 다양한 기기를 통해 네트워크 접속이 가능하게 되었고, 많은 사람들은 원격 저장소 서비스를 통해 언제 어디서든 자신의 데이터를 저장 및 접근할 수 있게 되었다. 하지만 최근 이러한 원격 저장소 서비스를 제공하는 서버의 신뢰성 문재가 제기 되고 있다. 이를 해결하기 위해 데이터의 암호화, 암호화된 데이터를 안전하게 검색할 수 있도록 하는 검색 가능한 암호기술이 연구되고 있다. 하지만, 기존의 검색 가능한 암호 기술은 분산된 서버 구조를 가지는 원격 저장소의 특성을 고려하지 않고 있어 바로 적용하기 어렵다는 문제점을 가지고 있다. 따라서 본 논문은 원격 저장소 구조에 특화되어 있으며 빠른 암, 복호화 속도를 제공하는 검색가능한 암호 기술을 제안한다.

• Proceedings of the Korean Society of Computer Information Conference
• /
• 2024.01a
• /
• pp.423-424
• /
• 2024

본 논문은 TCP/IP 네트워크 및 암호 프로토콜을 결합하여 CCTV 카메라 영상 데이터를 안전하게 전송하는 시스템에 관한 것이다. 특히, TCP Handshake에서 암호 키를 교환하고, 디바이스의 시그니처 정보를 활용하여 키를 생성하는 키 교환 암호 프로토콜을 도입한다. 이를 통해 CCTV 카메라의 영상 데이터를 암호화하여 전송하고, 수신 시 복호화하여 저장한다. 또한, 적어도 하나 이상의 CCTV 카메라에 대한 보안 인증과 네트워크 연결 상태를 제어하며, 중간자 공격을 방지하기 위한 안전한 키 교환을 수행한다. 이로써 안전성이 강화된 CCTV 카메라 시스템을 제공할 수 있다.

• KIPS Transactions on Computer and Communication Systems
• /
• v.4 no.3
• /
• pp.105-108
• /
• 2015

In this paper, we propose a differential fault analysis on symmetric SPN block cipher with bitslice involution S-box in 2011. The target block cipher was designed using AES block cipher and has advantage about restricted hardware and software environment using the same structure in encryption and decryption. Therefore, the target block cipher must be secure for the side-channel attacks. However, to recover the 128-bit secret key of the targer block cipher, this attack requires only one random byte fault and an exhausted search of $2^8$. This is the first known cryptanalytic result on the target block cipher.

• Proceedings of the Optical Society of Korea Conference
• /
• 2004.07a
• /
• pp.262-263
• /
• 2004

• Journal of the Korea Institute of Information Security & Cryptology
• /
• v.34 no.2
• /
• pp.157-166
• /
• 2024

Probability of decryption failure of a public key cryptography based on LWE(learning with errors) is determined by its architecture and parameter settings. Since large decryption failure probability leads to attacks[1] on scheme as well as degradation of performance, TiGER[2], a Ring-LWE(R)-based KEM proposed for the first round of KpqC, tried to reduce the decryption failure probability by using error correction code Xef and D2 encoding method. However, D'Anvers et al. has shown that the commonly assumed independence of each bit error is not established since in the case of an encryption scheme based on Ring-LWE(R) using an error correction code, there is error dependency which is not negligible[3]. In this paper, since TiGER does not consider the error dependency, we calcualte the decryption failure probability of TiGER by considering the error dependency. In addition, we found that the bit error probability is incorrectly calculated in TiGER, so we present the correct calculation.

• The KIPS Transactions:PartC
• /
• v.12C no.2 s.98
• /
• pp.183-190
• /
• 2005

In this thesis, first, we propose I-frame encryption techniques of video data for video data itself encryption and propose license agent that processing user's certification and decryption in client system automatically when user execute encrypted video data in system server. License agent runs user's certification, encryption and decryption of video data based on PID(Public Key Infrastructure) using shared key-pool when execute of video data. Also, compose duplex buffer control and propose real time decryption method using efficient buffer scheduling to reduce much playing delay times that happen processing decryption when execute of videoa data of high-capacity.

• Journal of the Korea Society of Computer and Information
• /
• v.16 no.1
• /
• pp.143-151
• /
• 2011

Plaintext and key are independent in the existing block cipher. Also, encryption/decryption is performed by using structural features. Therefore, the external environment of suggested mixed cryptographic algorithm is identical with the existing ones, but internally, features of the existing block cipher were meant to be removed by making plaintext and key into dependent functions. Also, to decrease the loads on the authentication process, authentication add-on with dependent characteristic was included to increase the use of symmetric cryptographic algorithm. Through the simulation where the proposed cryptosystem was implemented in the chip level, we show that our system using the shorter key length than the length of the plaintext is two times faster than the existing systems.

• Journal of IKEEE
• /
• v.18 no.3
• /
• pp.328-334
• /
• 2014

This paper proposes an optical encryption and decryption system for OFB(Output Feedback Block) encryption algorithm. The proposed scheme uses a dual-encoding technique in order to implement optical XOR logic operation. Also, the proposed method provides more enhanced security strength than the conventional electronic OFB method due to the huge security key with 2-dimensional array. Finally, computer simulation results of encryption and decryption are shown to verify the proposed method, and hence the proposed method makes it possible to implement more effective and stronger optical block encryption system with high-speed performance and the benefits of parallelism.

• The Journal of the Korea Contents Association
• /
• v.21 no.9
• /
• pp.42-50
• /
• 2021

As the Internet environment develops, data-analysis-based applications have been widely and extensively used in the past decade. However, these applications potentially have a privacy problem in that users' personal information may be leaked to unauthorized parties. To tackle such a problem, researchers have suggested several techniques including data perturbation and cryptography. The homomorphic encryption algorithm is a relatively new cryptography technology that allows arithmetic operations for encrypted values as it is without decryption. Since original values are not required, we believe that this method provides better privacy protection than other existing solutions. In this work, we propose to apply a homomorphic encryption algorithm that protects personal information while enabling data analysis.