• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.20 no.3
• /
• pp.543-548
• /
• 2016

Public electronic certificates, as an important means for identification, have been used as the main economic transactions, including banking, e-government, e-commerce. identification. However, damage cases of certificates have been increased by Illegally issued and by hacking practices. Also the users have a difficult in ensuring that their certificates when and where to use. Therefore, the proposed system gives the organization code for the Institutions using OCSP services in advance, the organization code embedded in extensions of OCSP request message structure when institutions ask the validation of certificate to CA(Certificate Authority). Also, OCSP server can extract the organization code from OCSP request message, confirm the institution, and record it in certificate history management table of DB. In this paper, we presented a system that could determine the certificate history check using OCSP service, public electronic certificate validation service, and implemented to prevent and cope immediately with financial incidents.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.37 no.2C
• /
• pp.132-139
• /
• 2012

In 2011, Woosik Bae proposed a NLMAP(New Low-cost Mutual Authentication Protocol) in RFID based on hash function. They argued that minimize computation such as random number generation. In addition, NLMAP is safe against replay attack, spoofing attack, traffic analysis and eavesdropping attack due to using mutual authentication. So, when applied to RFID system has advantage such as providing a high level of security at a lower manufacturing cost. However, unlike their argue, attacker can obtain Tag's hash computed unique identification information. This paper proves possible the location tracking and spoofing attack using H(IDt) by attacker. In addition, we propose the improved a mutual authentication protocol in RFID based on hash function and CRC code. Also, our protocol is secure against various attacks and suitable for efficient RFID systems better than NLMAP.

• Journal of the Korea Institute of Information Security & Cryptology
• /
• v.14 no.6
• /
• pp.105-110
• /
• 2004

MAC is used for data origin authentication or message integrity protection. In Crypto'03 Cary and Venkatesan introduced new MAC based on unimodular matrix groups. It is to encrypt messages using private keys and to encrypt them again using public keys which are matrices whose determinants are $\pm$1. These matrices have property called k-invertible. This k effects on the collision probability of this new MAC. The smaller k is, the less collisions occur. Cary shows 6-invertible matrices, and 10-invertible matrices whose components are only 1, 0, -1. In this paper we figure out sufficient conditions about choosing 4 matrices among special 22 matrices. Also, we introduce 5-invertible matrices whose components are 1, 0, -1. Those have better efficiency and security.

• Journal of Advanced Navigation Technology
• /
• v.12 no.5
• /
• pp.451-463
• /
• 2008

There are management and security of software source code equivalent to 10 assembly lines of important infrastructure in the early stage of information society directly. A support technology and framework to protect software source code are so poor state In this paper, the proposed model that is support protection and access control between software source code as object and subject that is not authenticated safely was named CRYPTEX model. And we propose active business model to provide delegate, mobile, and security/access control function for passive software source code in document state using CRYPTEX.

• Journal of the Korea Convergence Society
• /
• v.10 no.12
• /
• pp.63-69
• /
• 2019

Using a smartphone allows quick and easy authentication and payment. However, smartphone security threats are evolving into a variety of new hacking technologies, and are changing to attacks specific to the mobile environment. Therefore, there is a demand for an authentication method suitable for a mobile environment. In order to solve security weaknesses in knowledge-based authentication, many companies provide two-step authentication services such as OTP(One Time Password) to provide authentication services such as finance, games, and login. Although OTP service is easy to use, it is easy to duplicate random number table and has a disadvantage that can be reused because it is used as valid value within time limit. In this paper, we propose a mechanism that enables users to quickly and easily authenticate with high security using the authentication method that recognizes special characters through smartphone's dedicated application.

• Journal of KIISE:Computer Systems and Theory
• /
• v.29 no.5
• /
• pp.284-290
• /
• 2002

We propose a new authenticated encryption scheme that does not require any block encryption algorithm. Our scheme is based on the Horster-Michels-Petersen authenticated encryption scheme, and it uses a technique in the Bae~Deng signcryption scheme so that the sender's signature can be verified by an arbitrary third party. Since our scheme does not use any block encryption algorithm, we can reduce the code size in its implementation. The computation and communication costs of the proposed scheme are almost the same as those of the Bao-Deng scheme that uses a block encryption algorithm. Our scheme also satisfies all the security properties such as confidentiality, authenticity and nonrepudiation.

• The Journal of the Convergence on Culture Technology
• /
• v.7 no.1
• /
• pp.551-557
• /
• 2021

With increase of electric vehicle in the road, the number of charging/discharging infrastructure for electric vehicle in public space is also increased rapidly. To charge or discharge the electric vehicle the user of electric vehicle and service provider should verify the each other's identity to minimize security vulnerability. This paper proposes mutual authentication scheme between electric vehicle and charging/discharging service provider with help of hash function and Message Authentication Code(MAC). Also efficient operating scheme for charging/discharging service system is proposed. The analysis shows that the system has robustness against security vulnerability. Also this system can keep the sensitive personal information of service user safely.

• KIPS Transactions on Software and Data Engineering
• /
• v.11 no.5
• /
• pp.197-202
• /
• 2022

IoT (Internet of Things) devices are being attacked by malware due to many security vulnerabilities, such as the use of weak IDs/passwords and unauthenticated firmware updates. However, due to the diversity of CPU architectures, it is difficult to set up a malware analysis environment and design features. In this paper, we design time series features using the byte sequence of executable files to represent independent features of CPU architectures, and analyze them using recurrent neural networks. The proposed feature is a fixed-length time series pattern extracted from the byte sequence by calculating partial entropy and applying linear interpolation. Temporary changes in the extracted feature are analyzed by RNN and LSTM. In the experiment, the IoT malware detection showed high performance, while low performance was analyzed in the malware family classification. When the entropy patterns for each malware family were compared visually, the Tsunami and Gafgyt families showed similar patterns, resulting in low performance. LSTM is more suitable than RNN for learning temporal changes in the proposed malware features.

• Proceedings of the Korean Institute of Intelligent Systems Conference
• /
• 2002.05a
• /
• pp.37-42
• /
• 2002

현행 출입국 관리는 사용자가 여권을 제시하면, 여권을 육안으로 검색하고 수작업으로 정보를 입력하여 여권의 데이터 베이스와 대조하였다. 이러한 종래의 출입국 관리 시스템은 출입국 심사 시간이 길어 출입국자에 불편을 제공하고 출입국 부적격자에 대한 정확한 검색이 이루어지지 않아 체계적으로 관리하기가 어려웠다. 이리한 종래의 문제점을 개선하기 위해 영상 처리와 문자 인식을 이용한 여권 인증 시스템을 제안한다. 된 논문에서는 여권 영상에 대해 소벨 연산자와 스미어링 기법 그리고 윤곽선 추적 알고리즘을 이용하여 사진영역, 코드 영역 및 개별 코드 문자를 추출하고 개별 코드 문자 인식은 기존의 퍼지 ART를 개선하여 적용한다. 다양한 국내 여권 영상에 대해 제안된 여권 인식 방법을 실험한 결과, 제안된 방법이 여권 인식에 우수한 성능을 보였고 개선된 퍼지 ART 알고리즘이 기존의 퍼지 ART 알고리즘보다 클러스터 수가 적게 생성되고 인식률도 향상된 것을 확인하였다

• Proceedings of the Korea Information Processing Society Conference
• /
• 2004.05a
• /
• pp.1051-1054
• /
• 2004

액티브 네트워크란 네트워크에 프로그램 가능한 라우터나 스위치를 배치하여, 전송되는 패킷들을 서비스 특성이나 사용자 요구에 따라 적합하게 연산, 처리작업을 수행하고 수정할 수 있는 네트워크를 말한다. 그러나 이러한 액티브 네트워크의 단점은 기존의 패시브 네트워크가 패킷 포워딩 기능만을 제공하는 것에 비해 더욱 복잡한 네트워크 상태로 인해 보다 많은 보안상의 위협과 공격이 훨씬 쉽고 다양하다. 이에 따라 보안 및 안전의 문제가 중요한 관심사가 되었다. 본 논문에서는 악의적인 목적으로 액티브 노드의 취약성을 이용하여 어플리케이션 코드를 액티브 노드에 설치하게 되어 전체적인 네트워크를 위협할 수 있는 액티브 네트워크의 단점을 보완하고자, 설치하려는 어플리케이션 코드에 대한 인증 및 무결성과 접근권한 기법을 이용한 어플리케이션 코드의 관리와 전송제어를 하는 ANASP시스템을 설계 및 구현하고자 한다.