• Proceedings of the Korea Information Processing Society Conference
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• 2012.11a
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• pp.969-972
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• 2012

기존의 CCTV와는 달리 IP Camera는 네트워크에 유선 또는 무선으로 직접 연결되며 IP Camera에 임베디드된 웹 서버를 통하여 서비스를 제공한다. 한 건물 또는 지역 안에는 다수의 IP Camera가 설치될 수 있다. 이때 각 각의 IP Camera에 웹 서버가 존재하기 때문에 웹서버 마다 다른 key를 가지고 관리하게 되어 서버 관리에 있어서 비효율적이다. 또한 단순 ID, Password로 사용자 인증을 하며 별도의 암호화 과정을 거치지 않기 때문에 취약점을 갖는다. 따라서 본 논문에서는 그룹 키를 이용하여 다수의 웹 서버의 키를 관리하고 PKI 암호를 통하여 사용자 인증 및 세션 키를 생성함으로써 위장 공격, 기밀성, 무결성, 재사용 공격 등의 보안 취약점을 강화한다.

• Review of KIISC
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• v.29 no.5
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• pp.51-61
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• 2019

보안은 5G 이동통신 네트워크의 성공적인 정착을 위한 필요충분조건이다. 5G 보안의 중요한 표준으로 3GPP (3rd Generation Partnership Project)의 보안 담당 워킹그룹인 SA3는 3GPP 5G 보안구조를 제시하였다. 특히, 3GPP 5G 보안구조는 Extensible Authentication Protocol (EAP) 인증 프레임워크를 채택함으로써 이기종의 다양한 인증 기법과 자격증명을 용이하게 포용할 수 있는 유연성을 갖추었다. 서비스 융합 네트워크를 지향하는 5G의 비전을 고려할 때, EAP 인증 프레임워크는 보안측면에 있어서 매우 중요한 전략이라고 볼 수 있다. 따라서, 본 논문에서는 3GPP 5G 보안구조를 위한 EAP 인증 프레임워크를 고찰한다. 이를 위해, 1차 인증을 위한 EAP 기반의 인증 프로토콜 EAP-AKA'을 면밀히 검토하면서 1차 인증에서의 EAP 인증 프레임워크 적용방안을 분석한다. 아울러, 2차 인증을 위한 EAP 인증 프레임워크의 적용과 네트워크 슬라이싱 (Network Slicing)과의 연동을 살펴본다.

• Proceedings of the Korea Information Processing Society Conference
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• 2011.11a
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• pp.951-954
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• 2011

IT 기술의 발전으로 M2M 시장이 급부상하고 있는 가운데 M2M 응용분야 중 텔레매틱스의 개념 및 차량 네트워크 보안의 취약성을 알아보았다. 차량 및 IT 기술의 융합과 이동통신망 기술의 발전은 사용자에게 제공되는 서비스의 질은 향상 시켰지만, 이로 인한 보안 위험성은 더 많아지고 다양해졌다. 이에 본 논문에서는 텔레매틱스의 새로운 비즈니스 모델과 이로 인해 발생 될 수 있는 차량 이동통신망 보안의 취약성을 분석하였다. 이 중 발생할 수 있는 위장공격을 예방하기 위해 M2M 기기와 스마트폰의 상호 인증 기법을 제시하였다.

• Proceedings of the Korea Information Processing Society Conference
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• 2011.11a
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• pp.778-781
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• 2011

기업의 기술이 점점 고도화가 진행되면서 문서유출사건에 대한 기업의 피해가 매년마다 증가하고 있다. 특히 내부직원에 의한 유출사건이 크게 증가함으로써 기업은 기업 내부의 보안수준을 올리고 있다. 이에 회사 내 출력물 보안을 위하여 기업은 프린터 보안 솔루션을 도입하지만 강한 보안성으로 인하여 인쇄가 많은 기업이나 부서에서는 잦은 사용자인증에 불편함을 느낄 수 있다. 본 연구는 기존의 출력물 보안 서비스와 비교하여 티켓을 이용한 사용자인증의 간소화와 권한문서관리를 제공하는 출력물 보안 솔루션을 설계하고 구현하였다.

• Journal of KIISE:Information Networking
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• v.37 no.3
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• pp.187-197
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• 2010

The fusion stream of recent broadcasting and communication make multimedia content served in the area of broadcasting into IPTV service which transmits it through high-speed internet, cable TV net and satellite net in realtime. However, as the digital broadcasting service is extended to various media, the security of IPTV service content provided to users by service provider is not fully supported by CAS(Conditional Access System) provided by existing broadcasting system. This paper proposes interactive certification protocol which can efficiently distinguish the receiving-qualification of user between Set-Top Box and Smart Card which are parts of configurations for IPTV system. The proposed protocol uses hash function to make Set-Top Box transmit receiving-qualification about the channel fee which user pays more properly than existing protocol. Also, the proposed protocol uses session key generated between receiver and smart card through inter certification process and encrypts EMM not the service to be used by anyone illegally.

• Journal of the Korea Society of Computer and Information
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• v.16 no.10
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• pp.121-129
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• 2011

In wireless sensor networks, a compromised sensor node can inject false data during data aggregation. Existing solutions of securing data aggregation require high communication cost in securing data aggregation. In this paper, we propose a monitoring-based secure data aggregation protocol that minimizes communication cost of identifying the location of false data injection attacks. The main idea is that when monitoring nodes find an injected false data, their reporting messages along with Message Authentication Codes (MACs) are summarized in a single message before sending it to the Base Station (BS). Then the BS identifies the attacking node. The simulation shows that energy consumption of the proposed protocol with short and normal concatenations of MACs are 45% and 36% lower than that of an existing protocol, respectively.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.18 no.4
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• pp.867-875
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• 2014

Rapid development of internet service is enabling internet banking services in anywhere and anytime. However, service access through internet can be exposed to adversary easily. To prevent, current service providers execute authentication process with user's identification and password. However, majority of users use short and simple password and do not periodically change their password. As a result of this, user's password could be exposed to attacker's brute force attack. In this paper, we presented enhanced password system which guarantee higher security even though users do not change their current password. The method uses additional secret information to replace real password periodically without replacement of real password.

• Journal of the Korea Convergence Society
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• v.8 no.6
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• pp.37-44
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• 2017

Mobile devices provide various services through payment and authentication by inputting important information such as passwords on the screen with the virtual keypads. In order to infer the password inputted by the user, the attacker captures the user's touch location information. The attacker is able to infer the password by using the location information or to obtain password information by peeping with Google Glass or Shoulder Surfing Attack. As existing secure keypads place the same letters in a set order except for few keys, considering handy input, they are vulnerable to attacks from Google Glass and Shoulder Surfing Attack. Secure keypads are able to improve security by rearranging various shapes and locations. In this paper, we propose secure keypads that generates 13 different shapes and sizes of Tetris and arranges keypads to be attached one another. Since the keypad arranges different shapes and sizes like the game, Tetris, for the virtual keypad to be different, it is difficult to infer the inputted password because of changes in size even though the attacker knows the touch location information.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.13 no.2
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• pp.285-292
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• 2009

In 2005, Lee and Chen suggested an enhanced one-time password authentication scheme which can prevent the stolen verifier attack that the Yeh-Shen-Whang's scheme has. The Lee-Chen's scheme addresses the stolen verifier attack by deriving each user's pre-shared secret SEED from the server secret. However, we investigated the weakness of the Lee-Chen's scheme and found out that it was suffering from the off-line dictionary attack on the server secret. We demonstrated that the off-line dictionary attack on the server secret can be easily tackled with only the help of the Hardware Security Modules (HSM). Moreover, we improved the scheme not to be weak to the denial of service attack and allow compromise of the past session keys even though the current password is stolen. Through the comparison between the Lee-Chen's scheme and the proposed one, we showed that the proposed one is stronger than other.

• KIPS Transactions on Computer and Communication Systems
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• v.2 no.11
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• pp.495-502
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• 2013

In this paper, we present an anonymous authentication and location assurance protocol for secure location-aware services over vehicular ad hoc networks (VANETs). In other to achieve our goal, we propose the notion of a location-aware signing key so as to strongly bind geographic location information to cryptographic function while providing conditional privacy preservation which is a desirable property for secure vehicular communications. Furthermore, the proposed protocol provides an efficient procedure based on hash chain technique for revocation checking to effectively alleviate communication and computational costs on vehicles in VANETs. Finally, we demonstrate comprehensive analysis to confirm the fulfillment of the security objectives, and the efficiency and effectiveness of the proposed protocol.