• 디지털융복합연구
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• 제11권11호
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• pp.775-781
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• 2013

N-스크린은 단일 컨텐츠를 다중 디바이스에서 시간 공간의 제약 없이 제공 받을 수 있는 서비스이다. 네트워크가 달라지거나 디바이스가 달라질 경우 혹은 플랫폼이 달라지는 경우에도 적합한 인증을 거쳐 디바이스에 맞는 영상을 끊김 없이 보낸다. 이에 따라 발생하는 보안 위협 요소로는 사용자 인증에 대한 문제가 발생한다. 이에 본 논문에서는 N-스크린의 특성상 발생하는 다중 디바이스에서 사용 가능한 인증 시스템을 제안하고자 한다. 기존의 인증기법 중 가볍고 처리 절차가 간단한 인증기법인 준동형 암호 알고리즘을 사용하여 사용자 인증을 간소화하였고, DATA의 무결성을 보장하고자 하였다. 또한 다중 디바이스를 사용하는 N-스크린 서비스의 특성상 장비 변경에 따른 추가 인증을 간편하게 처리하고자 하였다. 제안한 인증 프로토콜에 대한 효율성과 안전성에 대한 검토 결과, 암호 알고리즘을 처리하는데 작은 저장 용량과 낮은 프로세서에도 동작하기 쉽기 때문에 다중 디바이스를 사용하는 데 안전하고 적합하였다.

• Journal of information and communication convergence engineering
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• 제9권4호
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• pp.441-446
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• 2011

Radio frequency identification (RFID) tags are cheap and simple devices that can store unique identification information and perform simple computation to keep better inventory of packages. Security protocol for RFID tags is needed to ensure privacy and authentication between each tag and their reader. In order to accomplish this, in this paper, we analyzed a lightweight privacy and authentication protocol for passive RFID tags.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2004년도 Proceedings of ISRS 2004
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• pp.95-98
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• 2004

In this paper, we propose policy-based authentication framework which consists of policy server, CA and a policy language designed for ubiquitous environments. Using policies allows the security functionality to be modified without changing the implementation of the entities involved. Policy-based authentication framework needs to be very expressive but lightweight and easily extensible. We propose the feasibility of our policy language and policy-based authentication framework in ubiquitous-environment through a prototype and solve the problem that traditional framework have a simple registration and authentication to provide dynamic service.

• Journal of Communications and Networks
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• 제16권4호
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• pp.363-370
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• 2014

Despite several years of intense research, the security and cryptography in wireless sensor networks still have a number of ongoing problems. This paper describes how identification (ID)-based node authentication can be used to solve the key agreement problem in a three-layer interaction. The scheme uses a novel security mechanism that considers the characteristics, architecture, and vulnerability of the sensors, and provides an ID-based node authentication that does not require expensive certificates. The scheme describes the routing process using a simple ID suitable for low power and ID exposure, and proposes an ID-based node authentication. This method achieves low-cost communications with an efficient protocol. Results from this study demonstrates that it improves routing performance under different node densities, and reduces the computational cost of key encryption and decryption.

• 한국정보통신학회논문지
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• 제15권11호
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• pp.2340-2346
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• 2011

본 논문은 유동적 USIM(Universal Subscriber Identity Module)을 이용한 사용자 편의를 위한 인증시스템을 제안한다. 유동적 USIM 카드는 이동통신망 이용자에게 시스템에서 단말의 할당된 고유번호나 주민등록번호와 같은 개인화 정보를 인증의 인자로 이용하여 제한된 횟수나 사용시간을 허가하는 인증 방법이다. 본 연구에서 제안하는 모듈을 검증하기 위해 시뮬레이션을 수행하였으며 제안한 알고리즘 및 시스템이 현재의 시스템에서 완벽하게 동작하며, 기존의 USIM 카드를 사용하는 인증방법과도 높은 호환성을 확인하였다. 또한 유동적 USIM 카드를 이용하여 또 다른 인증방식을 설계할 수도 있음을 제시하였다. 제안하는 유동적 USIM 기술을 적용할 경우 간단하면서도 강력한 인증방법과 시스템을 개발할 수 있을 것이며 사용자 환경과 독립적으로 이동통신망 접근을 가능하게 해 줄 수 있다.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2010년도 추계학술대회
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• pp.629-630
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• 2010

Radio frequency identification (RFID) tags are cheap, simple devices that can store unique identification information and perform simple computation to keep better inventory of packages. Because of this, they are intended to replace the barcodes for supply chain management in the near future. However, unlike barcodes, these tags have a longer range in which they are allowed to be scanned, subjecting them to unauthorized scanning by malicious readers and to various attacks. Therefore, a security protocol for RFID tags is needed to ensure privacy and authentication between each tag and their reader. In order to accomplish this, in this paper, we proposed a lightweight privacy and authentication protocol for passive RFID tags.

• 한국컴퓨터정보학회논문지
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• 제22권9호
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• pp.65-71
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• 2017

This paper proposes a smart phone authentication method based on user's behavior and habit that is an authentication method against shoulder surfing attack and brute force attack. As smart phones evolve not only storage of personal data but also a key means of financial services, the importance of personal information security in smart phones is growing. When user authentication of smart phone, pattern authentication method is simple to use and memorize, but it is prone to leak and vulnerable to attack. Using the features of the smart phone pattern method of the user, the pressure applied when touching the touch pad with the finger, the size of the area touching the finger, and the time of completing the pattern are used as feature vectors and applied to user authentication security. First, a smart phone user models and stores three parameter values as prototypes for each section of the pattern. Then, when a new authentication request is made, the feature vector of the input pattern is obtained and compared with the stored model to decide whether to approve the access to the smart phone. The experimental results confirm that the proposed technique shows a robust authentication security using subjective data of smart phone user based on habits and behaviors.

• 한국멀티미디어학회논문지
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• 제10권12호
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• pp.1655-1662
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• 2007

Although the PKl-based user authentication solution has been widely used, the security of it can be deteriorated by a simple password. This is because a long and random private key may be protected by a short and easy-to-remember password. To handle this problem, many biometric-based user authentication solutions have been proposed. However, protecting biometric data is another research issue because the compromise of the biometric data will be permanent. In this paper, we present an implementation to improve the security of the typical PKI-based authentication by protecting the private key with a fingerprint. Compared to the unilateral authentication provided by the typical biometric-based authentication, the proposed solution can provide the mutual authentication. In addition to the increased security, this solution can alleviate the privacy issue of the fingerprint data by conglomerating the fingerprint data with the private key and storing the conglomerated data in a user-carry device such as a smart card. With a 32-bit ARM7-based smart card and a Pentium 4 PC, the proposed fingerprint-based PKI authentication can be executed within 1.3second.

• Journal of Information Processing Systems
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• 제16권3호
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• pp.599-611
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• 2020

With the application and promotion of biometric technology, biometrics has become more and more important to identity authentication. In order to ensure the privacy of the user, the biometrics cannot be stored or manipulated in plaintext. Aiming at this problem, this paper analyzes and summarizes the scheme and performance of the existing biometric authentication system, and proposes an iris-based ciphertext authentication system based on fully homomorphic encryption using the FV scheme. The implementation of the system is partly powered by Microsoft's SEAL (Simple Encrypted Arithmetic Library). The entire system can complete iris authentication without decrypting the iris feature template, and the database stores the homomorphic ciphertext of the iris feature template. Thus, there is no need to worry about the leakage of the iris feature template. At the same time, the system does not require a trusted center for authentication, and the authentication is completed on the server side directly using the one-time MAC authentication method. Tests have shown that when the system adopts an iris algorithm with a low depth of calculation circuit such as the Hamming distance comparison algorithm, it has good performance, which basically meets the requirements of real application scenarios.

• 한국콘텐츠학회논문지
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• 제14권11호
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• pp.533-540
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• 2014

현재 응용시스템 혹은 시스템에서 사용되고 있는 사용자 인증방법은 단순한 ID/PW를 비롯하여 인증서, 지문/홍채, 전화, 보안카드, OTP 등 다양한 기술들이 사용되고 있다. 하지만 단순한 ID/PW, 전화인증 등은 보안에 취약한 단점이 있고, 인증서, 지문/홍채, 보안카드/OTP 등은 보안에 취약점은 상당 부분 해소했으나 이를 활용하기에는 소요되는 비용 및 복잡성이 내재되어 있다. 본 논문에서는 보안강도를 제고하면서 흔히 소장하고 있는 USB와 같은 이동형 저장매체를 활용하여 저비용으로 사용자 인증을 보다 안전하게 할 수 있는 새로운 방안을 제안하였다.