• Journal of the Korea Society of Computer and Information
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• v.17 no.4
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• pp.121-127
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• 2012

Biometric technology has been proposed as a new means to replace conventional PIN or password because it is hard to be lost and has the low possibility of illegal use. However, unlike a PIN or password, there is no way to modify the exposure if it is exposed and used illegally. To solve the problems, we propose to apply OTP using biometric information to mobile devices for more secure and adaptable authentication. In this paper, we propose a secure framework for delivering biometric information as mobile OTP to the server (TTP) and compared this paper with existed methods about security and performance.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.65 no.12
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• pp.2167-2176
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• 2016

In the multi-server environment, remote user authentication has a very critical issue because it provides the authorization that enables users to access their resource or services. For this reason, numerous remote user authentication schemes have been proposed over recent years. Recently, Lin et al. have shown that the weaknesses of Baruah et al.'s three factors user authentication scheme for multi-server environment, and proposed an enhanced biometric-based remote user authentication scheme. They claimed that their scheme has many security features and can resist various well-known attacks; however, we found that Lin et al.'s scheme is still insecure. In this paper, we demonstrate that Lin et al.'s scheme is vulnerable against the outsider attack and user impersonation attack, and propose a new biometric-based scheme for authentication and key agreement that can be used in the multi-server environment. Lastly, we show that the proposed scheme is more secure and can support the security properties.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2017.05a
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• pp.312-313
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• 2017

Internet of Things(IoT) is an intelligent technology and service in which all objects communicate with each other through various networks. Recently Internet of Things(IoT) is one of the fields that is attracting attention as the development of ICT industry. MQTT is a protocol which is safe using TLS or adopting light packet structure for effciency of memory and power using. In this paper, when TLS is used the process of encryption / decryption in the broker occurs. We propose an efficient MQTT protocol through centralized key management by adding authentication server.

• Journal of Korea Society of Digital Industry and Information Management
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• v.13 no.4
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• pp.13-23
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• 2017

In order to protect personal information and important information (confidential information, sales information, user information, etc.) in the internal network, companies and organizations apply encryption to the Server-To-Server or Server-To-Client communication section, And are experiencing difficulties due to the increasing number of known attacks and intelligent security attacks. In order to apply the existing S / W encryption technology, it is necessary to modify the application. In the financial sector, "Comprehensive Measures to Prevent the Recurrence of Personal Information Leakage in the Domestic Financial Sector" has been issued, and standard guidelines for financial computing security have been laid out, and it is required to expand the whole area of encryption to the internal network. In addition, even in environments such as U-Health and Smart Grid, which are based on the Internet of Things (IoT) environment, which is increasingly used, security requirements for each collection gateway and secure transmission of the transmitted and received data The requirements of the secure channel for the use of the standard are specified in the standard. Therefore, in this paper, we propose a secure encryption algorithm through mutual authentication and grouping for each node through H / W based Network Control Server (NCS) applicable to internal system and IoT environment provided by enterprises and organizations. We propose a protocol design that can set the channel.

• Journal of Internet Computing and Services
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• v.4 no.5
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• pp.87-96
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• 2003

The additional mechanism is required to set up a secure connection among the communication subjects in the internet environment. Each entity should transfer and receive the encrypted and hashed data to guarantee the data integrity. Also, the mutual authentication procedure should be processed using a secure communication protocol. Although the OpenSSL which implements the TLS is using by many developers and its stability and performance are proved, it has a difficulty in using because of its large size. So, this paper designs and implements the secure communication which the users can use easily by modification works of OpenSSL library API. We proved the real application results using the client/server case which supports a secure communication using the implemented API.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.12 no.6
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• pp.1022-1025
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• 2008

Session Initiation Protocol (SIP) has become the call control protocol of choice for Voice over IP (VoIP) networks because of its open and extensible nature. However, the integrity of call signaling between sites is of utmost importance, and SIP is vulnerable to attackers when left unprotected. Currently a herby-hop security model is prevalent, wherein intermediaries forward a request towards the destination user agent sewer (UAS) without a user agent client (UAC) knowing whether or not the intermediary behaved in a trusted manner. This paper presents an integrated security model for SIP-based VoIP network by combining hop-by-hop security and end-to-end security.

• Convergence Security Journal
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• v.18 no.3
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• pp.27-35
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• 2018

The certificate is electronic information issued by an accredited certification body to certify an individual or to prevent forgery and alteration between communications. Certified certificates are stored in PCs and smart phones in the form of encrypted files and are used to prove individuals when using Internet banking and smart banking services. Among the rapidly growing Android-based malicious applications are malicious apps that leak personal information, especially certificates that exist in the form of files. This paper proposes a method for judging whether malicious codes leak certificates by using DroidBox, an Android-based dynamic analysis tool.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2009.05a
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• pp.781-784
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• 2009

IPTV, which is convergence of Communication and Broadcasting, has improved quickly recently. This service can provide high quality and various services to their customers, such as choosing channels freely, VOD and many kinds of Interactive service. As the technology of IPTV rapid development, more and more people worry about its disadvantages during the spread and apply, for instance, the illegal application, illegal copy, access authority abuse and the danger of the IPTV contents. This paper will provide the solution to solve these problems, through the Public Key Certificate of PKI(Public Key Infrastructure) and the Attribute Certificate of PMI(Privilege Management Infrastructure).

• Journal of the Korea Institute of Information Security & Cryptology
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• v.17 no.1
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• pp.3-10
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• 2007

In this paper, we show that the status certificate-based encryption(SCBE) scheme proposed at ICISC 2004 and the certificateless signature(CLS) scheme proposed at EUC workshops 2006 are insecure. Both schemes are claimed that an adversary has no advantage if it controls only one of two participants making a cryptographic key such as a decryption key in SCBE or a signing key in CLS. But we will show that an adversary considered in the security model of each scheme can generate a valid cryptographic key by replacing the public key of a user.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.12 no.2
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• pp.89-100
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• 2002

In this paper, we propose a group key management architecture for the secure group communications in mobile netwowrks and authenticated key agreement protocol for this system. Most of existing group key management schemes un certificates based on the public key for the purpose of user authentication and key agreement in secure fashion however, we use the ICPK(Implicitly Certified Public key) to reduce the bandwidth for a certificate exchanging and to improve a computational efficiency. In this architecture, we use two-tier approach to deal with key management where the whole group is divided into two parts; the first is a cell groups consisted of mobile hosts and another is a control group consisted of cell group managers. This approach can provide flexibility of key management such that the affection for a membership change is locally restricted to the cell group which is an autonomous area of the CGM(Cell Group Manager).