• Journal of Korea Multimedia Society
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• v.14 no.6
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• pp.785-793
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• 2011

Since then, with the advance of computing environment, various Internet services are emerging and the importance of user authentication technology is increasing for verifying users authorized to use such services. Along with the advance of authentication technology, research is being made actively on one time password, which is used once in a session and then discarded. In existing one time passwords, however, the values of one time passwords in a created table are stored in serial order, and therefore, if the seed value and the number of one time passwords used are disclosed, one may infer the value of the one time password to be used next. What is more, one time passwords of the S/Key type have the problem that the number of uses is fixed. In this paper, We analysis the existing one time password. Also, We propose one time password methods using elliptic curve cryptography scheme and using enhanced randomness with time value.

• Journal of the Korea Convergence Society
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• v.5 no.4
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• pp.101-106
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• 2014

Most peoples are used to prefer to view the video contents rather than the other contents since the video contents are more easy to understand with both their eyes and ears. As the wide spread use of smartphones, the demands for the contents services are increasing rapidly. To promote the contents business, it's important to provide security of subscriber authentication and corresponding communication channels through which the contents are delivered. Generally, symmetric key encryption scheme is used to protect the contents in the channel, and the session key should be upadated periodically for the security reasons. In addition, to protect viewing paid contents by illegal users, the proxy authentication should not be allowed. In this paper, we propose biometric based user authentication and one time key generation models. The proposed model is consist of biometric template registration, session key generation and chanel encryption steps. We analyze the difference and benefits of our model with existing CAS models which are made for CATV contents protection, and also provides applications of our model in electronic commerce area.

• Proceedings of the Korea Institutes of Information Security and Cryptology Conference
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• 1998.12a
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• pp.381-387
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• 1998

불법적인 컴퓨터 사용이나 허가되지 않은 자료 접근 등, 컴퓨터 시스템에 대한 치부의 위협 문제들을 해결하기 위해서 사용자 인증 메커니즘(user authentication mechanism)과 같은 보호 메커니즘이 개발되고 있다. 그러나, 기술이 발전해 갈수록 패스워드와 같이 단순한 인증 메커니즘만으로는 이러한 문제를 해결하는 것이 불가능해지게 되었다. 또한, 이러한 문제를 해결하기 위해 지금까지 개발된 일회용 패스워드 메커니즘들도 대부분 특정 하드웨어 장치를 사용해야 하는 방식으로 개발됨으로써 개발품의 단가를 높이고 이를 적용한 시스템의 유지 보수를 까다롭게 해왔다. 이 논문에서는 이러한 점들을 고려하여 기존 일회용 패스워드 생성 메커니즘을 개선함으로써 스마트 카드와 같은 범용 저장 장치를 이용하여 운영하기 적합하도록 인증 메커니즘을 설계하고 구현하였다.

• Electronics and Telecommunications Trends
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• v.20 no.5 s.95
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• pp.70-83
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• 2005

양자암호통신 기술은 통신상의 보안을 자연의 기본원리인 양자역학의 법칙에 의해서 보장하므로 도청이나 감청이 절대적으로 불가능한 차세대 통신보안 기술로서 최근 크게 주목받고 있다. 즉, 양자암호통신 기술은 “양자 복제불가능성”과 같은 양자물리학의 법칙에 기초해서 송신자와 수신자 사이에 암호 키(일회용 난수표)를 절대적으로 안전하게 실시간으로 분배하는 기술로서 “양자 키 분배 기술”로도 알려져 있다. 본 고에서는 이러한 양자암호통신 기술의 기본원리 및 구현기술의 개요와 그 연구개발 동향에 대해서 기술한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2013.11a
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• pp.738-739
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• 2013

네트워크 및 컴퓨팅 기술의 발달로 데이터를 위탁 저장하고 이를 언제어디서든 다양한 단말로 처리할 수 있는 클라우드 스토리지 서비스가 활성화되고 있다. 하지만, 위탁 저장된 민감한 정보가 암호화 없이 저장된다면 서버에 저장된 데이터를 데이터 소유주의 동의 없이 공격자 및 비윤리적인 서버관리자가 열람할 수 있어 저장된 데이터의 암호화 및 이를 검색하는 검색 가능한 암호시스템(Searchable Encryption System)이 등장하게 되었다. 기존의 검색가능 암호 시스템은 같은 키워드를 검색하기 위해 생성된 트랩도어가 동일한 형태를 가지게 되어 공격자가 검색 쿼리를 통해 사용자가 어떤 데이터를 저장하고 검색하는지 학습이 가능하다. 본 논문은 사용자가 같은 키워드를 검색하더라도 매번 다른 트랩도어가 생성되도록 하여 비윤리적인 서버관리자가 검색 쿼리를 통해 검색 내용 및 데이터를 유추할 수 없도록 하는 일회용 트랩도어를 이용한 검색가능 암호 시스템을 제안한다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.13 no.1
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• pp.81-86
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• 2009

Almost all network systems provide an authentication mechanism based on user ID and password. In such system, it is easy to obtain the user password using a sniffer program with illegal eavesdropping. The one-time password and challenge-response method are useful authentication schemes that protect the user passwords against eavesdropping. In client/server environments, the one-time password scheme using time is especially useful because it solves the synchronization problem. In this paper, we propose a new identification scheme One Pass Identification. The security of Password base System is based on the square root problem, and Password base System is secure against the well known attacks including pre-play attack, off-line dictionary attack and server comprise. A number of pass of Password base System is one, and Password base System processes the password and does not need the key. We think that Password base System is excellent for the consuming time to verify the prover.

• Journal of Advanced Navigation Technology
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• v.14 no.4
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• pp.512-520
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• 2010

As the applications based on Mobile and Ubiquitous becoming more extensive, the communication security issues of those applications are appearing to be the most important concern. Therefore, every part of the system should be thoroughly designed and mutually coordinated in order to support overall security of the system. In this paper. we propose new technique which uses the voice features in order to generate Mobile One Time Passwords(OTPs). Voice is considered to be one of the powerful personal authentication factors of biometrics and it can be used for generating variable passwords for one time use. Also we performed a simulation of homomorphic variability of voice feature points using dendrogram and distribution of voice feature points for proposed password generation method.

• Journal of Advanced Navigation Technology
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• v.15 no.1
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• pp.39-53
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• 2011

As the applications within Mobile devices becoming more extensive, the mobile communication security issues of these applications and researches are appearing to be the most important concern. In this paper, we propose new integration OTP framework technique which uses the fingerprint and voice features of biometrics in order to generate Mobile One Time Passwords (OTPs) Token. The fingerprint and voice are considered to be one of the powerful personal authentication factors of biometrics and it can be used for generating variable passwords based on mobile environments for one time use. However, we performed a simulation of homomorphic variability of fingerprint and voice feature points using dendrogram and distribution of fingerprint and voice feature points for proposed password generation method, and verified validation of availability.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.13 no.10
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• pp.2113-2120
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• 2009

User authentication has been one of the most important part of the network system. OTP(One-Time Password) has been developed and applied to the existing authentication system. OTP makes a different password and abrogates used password each time when user is authenticated by the server. Those systems prevent stolen-key-problems which is caused by using the same key every log-in trial. Yet, OTP still has vulnerabilities. In this paper, an advanced protocol which is using clock-count method to apply a stream cipher algorithm to OTP protocols and to solve problems of existing OTP protocols is proposed.

• Journal of KIISE:Computer Systems and Theory
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• v.30 no.7_8
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• pp.417-425
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• 2003

We propose an efficient one-time signature scheme for stream authentication by improving HORS. When one-time signatures are used for authenticating live streams, one of the most serious drawbacks is that its large signature size yields high communication overhead. Compared with the previous one-time signature schemes, proposed scheme has the smallest signature size. Moreover, verification overhead is very low. Compared with the previous schemes for stream authentication, signing overhead of our scheme is larger than that of HORS but much lower than those of BiBa or Powerball. Moreover, signing operation can be trivially parallelized without any additional risk because it does not require sharing of the secret key between distributed servers.