• Proceedings of the Korea Information Processing Society Conference
• /
• 2003.05c
• /
• pp.2245-2248
• /
• 2003

본 논문에서는 Kerberos 인증 메커니즘과 Kerberos에 공개키기반의 환경을 결합시킨 PKINIT, PKTAPP, PKCROSS을 비교 분석하였다. 각 인증 메커니즘에서 키 교환을 위환 비밀키 및 공개키의 암 복호화, 서명 및 서명검증 등의 횟수를 분석하고 이를 기반으로 실제 인증에 소요되는 연산시간을 비교하였다. 분석 방법 및 견과를 다양한 환경에 적용한 적절한 인증 메커니즘을 선택하는데 활용할 수 있으며, 특히 모바일과 같은 연산능력이 제한되는 환경에 적합한 인증 기법 개발에 적용시키고자 한다.

• Proceedings of the Korean Society of Broadcast Engineers Conference
• /
• 2015.07a
• /
• pp.531-532
• /
• 2015

웹 서비스에 주로 적용되어 왔던 OAuth 2.0 사용자 인증 기법을 이벤트 기반 IoT 디바이스 데이터 통신 처리에 이용할 수 있도록 확장한다. OAuth 2.0 사용자 인증 기법은 최소화된 인증 절차에 맞추어져 있지만, 이벤트 기반의 IoT 디바이스의 데이터를 응용하기에는 적합하지 않은 실정이다. OAuth 2.0 사용자 인증 기법을 이용하여 이벤트 기반의 IoT 디바이스 데이터 통신으로 동작하기 위한 구성방법, Data Format, 그리고 전송 구조를 제안한다.

• Proceedings of the Korean Information Science Society Conference
• /
• 2003.10a
• /
• pp.787-789
• /
• 2003

네트워크 상에서 특정의 시스템 또는 컴퓨터에 접속하려고 하는 사람이 정당한 사용자인지를 판단, 그 결과에 근거하여 접근을 제어하는 일련의 프로그램 또는 하드웨어 장치들을 인증 시스템이라 하며, 최근에 들어 정보보호 측면에 있어서 그 중요성이 커지고 있다. 본 논문에서는 인증 데이터를 암호화 또는 부호화 시켜서 전송하는 종래의 인증 알고리즘과는 달리, 인증 데이터를 이미지와 같은 제3의 미디어에 은닉시켜서 전송함으로써 인증을 실시하는 새로운 인증 기법을 제안함과 아울러 시뮬레이션 결과를 제시함으로써 제안된 방법의 유효성을 나타내고 있다.

• Journal of the Korea Institute of Information Security & Cryptology
• /
• v.26 no.6
• /
• pp.1361-1373
• /
• 2016

Recently the need for user authentication with increasing, there are a variety of mechanisms, such as password, graphic authentication, token, biometrics and multiple authentication. in particular, the data of the 2-dimensional(2D) factors such as password, graphic authentication, biometrics is used because of the convenience. The stored information is problematic in that additional data recording needs to be performed whenever authentication data is updated. Furthermore, this storage method is problematic in that the time it takes to perform authentication increases because the time it takes to compare storage data with authentication data increases in proportion to an increase in the amount of the storage data. Accordingly, authentication through the rapid comparison of storage data with authentication data is a very important factor in data recording and authentication technology using memory. Using the three-dimensional(3D) optical memory by variously changing the recoding elements during recoding of data constitutes the way that multiple recoding different data storage. This enables high-density recoding in this way, and by applying the possible parallel processing at the time of recording and restoring method, provided that it is possible to quickly record and restore the data. In addition, each time to solve problems that require additional data recorded by a combination of the stored data record in the old data using a combination of the authentication. The proposed mechanism is proposed an authentication method using scheme after the recoding data in 3D optical memory to apply the conditions corresponding to the recoding condition when restoring the recorded data and through the experiment it was confirmed possible application as an authentication mechanism.

• Journal of Digital Convergence
• /
• v.10 no.5
• /
• pp.215-222
• /
• 2012

A smart phone has functions of both telephone and computer. The wide spread use of smart phones has sharply increased the demand for mobile commerce. The smart phone based mobile services are available anytime, anywhere. In commercial transactions, a digital signature scheme is used to make legally binding signature to prove both integrity of commercial document and verification of the signer. Smart phones are more risky compared with personal computers on the problems of how to protect privacy information. It's also easy to let proxy user to authenticate instead of the smart phone owner. In existing password or token based schemes, the ID is not physically bound to the owner. Thus, those schemes can not solve the problem of proxy authentication. To utilize the smart phone as the platform of mobile commerce, a study on the new type of authentication scheme is needed where the scheme should provide protocol to get legally binding signature and not to authenticate proxy user. In this paper, we create the mobile ID by using both the USIM and voice template of the smart phone owner. We also design and implement the user authentication scheme based on the mobile ID.

• Journal of Internet Computing and Services
• /
• v.10 no.6
• /
• pp.229-239
• /
• 2009

To solve user authentication problem, many remote user authentication schemes using password and smart card at the same time have been proposed. Due to the increasing of interest in personal privacy, there were some recent researches to provide user anonymity. In 2004, Das et al. firstly proposed an authentication scheme that guarantees user anonymity using a dynamic ID. In 2005, Chien et al. pointed out that Das et al.'s scheme has a vulnerability for guaranteing user anonymity and proposed an improved scheme. However their authentication scheme was found some weaknesses about insider attack, DoS attack, and restricted replay attack. In this paper, we propose an enhanced scheme which can remove vulnerabilities of Chien et al.'s scheme. The proposed authentication protocol prevented insider attack by using user's Nonce value and removed the restricted replay attack by replacing time stamp with random number. Furthermore, we improved computational efficiency by eliminating the exponentiation operation.

• Journal of KIISE:Information Networking
• /
• v.32 no.6
• /
• pp.659-667
• /
• 2005

A Mobile Ad Hoc Network(MANET) is a multi hop wireless network with no prepared base stations or centralized administrations, where flocks of peer systems gather and compose a network. Each node operates as a normal end system in public networks. In addition to it, a MANET node is required to work as a router to forward traffic from a source or intermediate node to others. Each node operates as a normal end system in public networks, and further a MANET node work as a router to forward traffic from a source or intermediate node to the next node via routing path. Applications of MANET are extensively wide, such as battle field or any unwired place; however, these are exposed to critical problems related to network management, node's capability, and security because of frequent and dynamic changes in network topology, absence of centralized controls, restricted usage on network resources, and vulnerability oi mobile nodes which results from the special MANET's character, shared wireless media. These problems induce MANET to be weak from security attacks from eavesdropping to DoS. To guarantee secure authentication is the main part of security service In MANET because networks without secure authentication are exposed to exterior attacks. In this paper, a multistage authentication strategy based on CGSR is proposed to guarantee that only genuine and veritable nodes participate in communications. The proposed authentication model is composed of key manager, cluster head and common nodes. The cluster head is elected from secure nodes, and key manager is elected from cluster heads. The cluster head will verify other common nodes within its cluster range in MANET. Especially, ID of each node is used on communication, which allows digital signature and blocks non repudiation. For performance evaluation, attacks against node authentication are analyzed. Based on security parameters, strategies to resolve these attacks are drawn up.

• Journal of the Korea Institute of Information Security & Cryptology
• /
• v.24 no.1
• /
• pp.165-170
• /
• 2014

In this paper, a hierarchical authentication protocol is proposed to minimize authentication delay in proxy mobile IPv6 networks. The authentication function of the AAA server is distributed to the LMAs and the MAGs. If the LMAs or the MAGs have authentication information of the MNs, they authenticate the MN on behalf of the AAA servers. Therefore, the authentication delay is reduced. The AAA server is vulnerable to denial-of-service attack. If the AAA server is down, MNs cannot access the proxy mobile IPv6 network until they are authenticated. The proposed scheme reduces the load on the AAA server by distributing the authentication function to the LMAs and the MAGs.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2016.10a
• /
• pp.301-302
• /
• 2016

최근 바이오메트릭 센서를 내장한 스마트폰 및 모바일 기기의 보급으로 바이오메트릭 인증에 대한 사람들의 관심이 증대되고 있다. 지문 인식은 사람마다 고유한 지문 정보를 이용하여 사용자를 인증하는 것으로 다른 바이오메트릭 인증 방법에 비하여 상대적으로 비용이 저렴하고 인식률이 높아 많은 응용에 적용된다. 하지만 사람의 지문은 실리콘 또는 젤라틴과 같은 물질을 이용해 쉽게 위조가 가능한 단점이 있다. 따라서, 지문인식용 센서는 온도, 빛 등의 2차적인 인증 수단을 함께 측정할 수 있어야 하는데, 이 경우 비용이 많이 들게 된다. 본 연구에서는 인증길이(지문인식을 위해서 스캔한 시간)와 지문인식에 사용된 손가락을 2차적인 인증 수단으로 사용하여 위조 지문 공격에 대응할 수 있는 지문 인증 기법을 제안한다. 제안한 기법은 2차 인증을 위한 키패드 기반의 패스워드 입력 부담을 줄일 수 있고 경제적이다.

• Journal of the Korea Convergence Society
• /
• v.7 no.1
• /
• pp.49-55
• /
• 2016

In a delegate authentication, a user can lend his/her own authentication data to the third parties to let them be authenticated instead of himself/herself. The user authentication schemes based on the memory of unique data such as password, are vulnerable to this type of attack. Biometric authentication could minimize the risk of delegate authentication since it uses the biometric data unique by each person. Group authentication scheme is used to prove that each group member belongs to the corresponding group. For applications such as an electronic voting or a mobile meeting where the number of group members is changing dynamically, a new group authentication method is needed to reflect the status of group in real time. In this paper, we propose biometric authentication based dynamic group signature scheme. The proposed scheme is composed of biometric key generation, group public key creation, group signature generation, group signature verification and member update protocols. The proposed member update protocol is secure against colluding attacks of existing members and could reflect group status in real time.