• Journal of Digital Convergence
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• v.13 no.8
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• pp.315-320
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• 2015

User Authentication in Online service is essential for accurate and safe service. For this user authentication, One Time Password(OTP) is frequently used. To satisfy one-time-use characteristic of OTP, Offset information to generate OTP or final OTP value get generated through OTP generator or security card which could be lost. In this study, OTP generation method that bypasses OTP generator or security card by using health information collected from u-Health care system is proposed. Suggestion is that health information collected through wearable devices get utilized to offset information that are applied in OTP generations. OTP generated using suggested methods showed similar results than current OTP generation methods in the collision resistance test which tests how often it generate same authentication numbers, this implies that new proposed method can be applied to various on-line services.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.25 no.5
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• pp.993-999
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• 2015

OTP(One time password) is widely used as an authentication method for financial and other security-sensitive transactions. OTP provides strong security since each password is used only one time while normal password-based authentications use passwords as long term secrets. However, OTP-based authentications relatively lack usability since they require users to hold an OTP card or generator. To overcome such a problem, smartphones start replacing OTP cards and such a method is called smart OTP. However, smart OTP inherits security vulnerabilities that smartphones have. In this paper, we propose a smart OTP authentication based on an extremely light authentication protocol called HB+. HB+ protocol is developed for low-cost devices and has small communication and computation costs. We present our solution and discuss its security, efficiency and practicality. Our contribution is providing a method to securely use smart OTP without losing its efficiency and usability.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2001.10a
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• pp.510-513
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• 2001

OTP(One-time Password) had been used much by method to do user certification so far. Because aspect that user certification that use OTP is efficient and economical fairly is much, it is one of method that can use easily. This treatise would apply OTP in message authentication and wishes to show that OTP is available for inter-authentication. First, examine about OTP's characteristic and overview in introduction, and explain about user certification method to use OTP in main discourse and method of message certification. And finally. wish to examine how OTP offers inter-authentication function.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.37 no.6C
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• pp.497-501
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• 2012

While increasing online services with developing e-businesses, finance, game companies and others have employed OTP(One-Time Password) to overcome vulnerabilities of static passwords. Existing OTP technology has inconvenience that customers always possess reserved token since requiring the token to generate OTP. In order to supplement the issue we propose mobile OTP generated by mobile devices such as smart phones. Our mobile OTP scheme generates OTP by using a non-linear function based on pairing to eject the collision problem of S/Key scheme universally used to design OTP schemes. Our scheme based on a non-linear function over pairing can complements the collision problem and widely applied to finance and various services to increase security level of the services.

• Proceedings of the Korea Information Processing Society Conference
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• 2015.10a
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• pp.87-90
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• 2015

기존의 OTP(One-Time Password) 인증 시스템은 OTP 단말을 휴대해야하는 불편함이 있으며 생성한 OTP 값을 그대로 OTP 단말에 출력하기 때문에 주변에 쉽게 노출될 수 있다. 또한, 기존의 9자리 패턴 인식 방법은 같은 패턴 지점을 연속으로 인식시킬 수 없고 패턴을 그리는 경로에 다른 패턴 지점이 포함될 수 있다는 한계가 있어 제한적인 패턴 결과를 가진다. 따라서, 본 논문은 원형 배치된 패턴 지점 기반의 OTP 대칭 값 패턴 인증 시스템을 통해 OTP 단말을 휴대할 필요가 없게 하고, OTP의 각 자리 값을 대칭 값으로 표현함으로써 OTP 값의 노출을 막는다. 또한 모든 OTP 값으로 패턴 인식이 가능하도록 하기 위해 패턴 지점을 원형 배치하는 방법을 제안한다. 이는 직접적으로 OTP 값이 노출될 가능성을 감소시키고, OTP 인증을 위한 패턴 인식에서 패턴 지점을 원형 배치함으로써 모든 OTP 값이 패턴으로 변환될 수 있도록 한다. 본 논문은 패턴 지점의 원형 배치와 대칭 값을 이용한 OTP 인증 시스템을 제안하여 새로운 OTP 인증 방법으로 패턴 인식을 적용할 수 있도록 한다.

• Journal of Digital Convergence
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• v.10 no.2
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• pp.183-191
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• 2012

This study proposes dual certification model using both what users know and what users own. In detail, this mobile OTP generation model is made up of mobile OTP generation and extraction algorithm satisfying the conditions for reviewing mobile OTP implementation. In order to improve the security of the existing OTP-based systems, the suggested method utilizes user's ID and random number at the mobile OTP generation stage.

• The KIPS Transactions:PartC
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• v.17C no.4
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• pp.361-370
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• 2010

OTP(One Time Password) is a user authentication using secure mechanism to authenticate each other in a way to generate a password, an attacker could intercept the password to masquerade as legitimate users is a way to prevent attacks. The OTP can be implemented as H/W or S/W. Token and card type OTP, implemented as H/W, is difficult to popularize because of having problem with deployment and usability. As a way to replace it implemented as S/W on Mobile or PC is introduced. However, S/W products can be target of malicious attacks if S/W products have vulnerability of implementation. In fact, FSA said the OTP implemented on a mobile have vulnerability of implementation. However, the OTP implemented on a PC have no case about analysis of vulnerability. So, in this paper derive security review and vulnerabilities analysis of implemented on a PC.

• Journal of the Institute of Electronics Engineers of Korea SD
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• v.46 no.5
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• pp.9-14
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• 2009

In this paper, we proposed a novel OTP unit bit of CMOS gate oxide antifuse using the standard CMOS process without additional process. The proposed OTP unit bit is composed of 3 transistors including an NMOS gate oxide antifuse and a sense amplifier of inverter type. The layout area of the proposed OTP unit bit is $22{\mu}m^2$ similar to a conventional OTP unit bit. The programming time of the proposed OTP unit bit is 3.6msec that is improved than that of the conventional OTP unit bit because it doesn't use high voltage blocking elements such as high voltage blocking switch transistor and resistor. And the OTP array with the proposed OTP unit bit doesn't need sense amplifier and bias generation circuit that are used in a conventional OTP array because sense amplifier of inverter type is included to the proposed OTP unit bit.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.38B no.5
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• pp.377-384
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• 2013

In order to improve the security strength in the password based user authentication, in which the security vulnerability is increased while the same password is repeatedly used, the OTP(One-Time Password) system has been introduced. In the OTP systems, however, the user account information and OTP value may be hacked if the user PC is infected by the malicious codes, because the user types the OTP value, which is generated by the mobile device synchronized with the server, directly onto the user PC. In this paper, we propose a new method, called DTOTP(Dual Transmission OTP), to solve this security problem. The DTOTP system is an improved two-factor authentication method by using the dual transmission, in which the user performs the server authentication by typing the user account and password information onto the PC, and then for the OTP authentication the mobile device scans the QR code displayed on the PC and the OTP value is sent to the server directly. The proposed system provides more improved security strength than that of the existing OTP system, and also can adopt the existing OTP algorithm without any modification. As a result, the proposed system can be safely applied to various security services such like banking, portal, and game services.

• Proceedings of the KAIS Fall Conference
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• 2009.05a
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• pp.154-157
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• 2009

정보통신기술의 발달로 온라인으로 많은 서비스가 이루어지면서 온라인을 통해서 송 수신 되는 정보들의 가치도 높아지고 있다. 현재 전자금융거래의 보안을 향상시키기 위해서 금융기관은 OTP 인증을 사용한다. OTP 인증은 패스워드 기반의 인증기술이며, OTP 토큰을 이용하여 OTP를 생성한다. 이러한 인증은 일방향 해시함수의 충돌성, OTP 토큰에 대한 물리적 공격, OTP 토큰의 전력소모에 따른 동기화 문제를 가지고 있다. 따라서 본 논문에서는 모바일 기기를 이용한 워터마킹 기반 3-Factor OTP 인증을 제안한다. 제안한 인증에서는 OTP를 생성하기 위해 사용자의 생체정보를 사용하며, 서비스 제공자는 사용자의 생체정보에 서버의 비밀정보를 워터마킹 기법을 이용하여 숨긴다. 워터마킹된 생체정보를 사용자의 모바일 기기의 저장하고, 이 정보를 통해 사용자는 생체정보를 인증하고, OTP를 생성한다. 제안한 인증기술은 OTP토큰을 휴대해야 하는 불편 대신에 대부분 성인이 휴대한 휴대폰과 같은 모바일 기기를 통해 OTP를 생성하고 인증을 할 수 있으며, 생체정보를 이용함으로써 다른 사용자가 OTP를 생성할 수 없도록 한다. 이러한 기법은 안전한 인증을 요구하는 모든 온라인 서비스에서 사용될 수 있다.