• The Journal of Korean Institute of Communications and Information Sciences
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• v.27 no.12C
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• pp.1238-1244
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• 2002

In this paper, H.235-based security mechanism for H.323 multimedia applications was implemented. H.235 covers authentication using HMAC, Diffie-Hellman key exchange, session key management for voice channel, and encryption functions such as DES, 3DES, RC2. Extra encryption algorithms such as SEED, and AES were also included for possible use in the future. And, we also analyzed the quality of service (QoS), the requirement of implementation, and interoperability to the result in this study. The results could be applied to secure simple IP phone terminals, gateways, or gatekeepers.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.42 no.1
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• pp.241-249
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• 2017

Recently, as a vehicle black box device has propagated, it has been increasingly used as a legal proof and there are the needs to verify an integrity of the video data. However, since the black box classified as the embedded system has a small capacity and low processing speed, there are limitations to the storage of video files and the integrity verification processing. In this paper, we propose a novel method for video files integrity in the black box environment with limited resources by using lightweight hash function LSH and the security of HMAC. We also present the test results of CPU idle rate at integrity verification in vehicle black box device by implementing this method, and verify the effectiveness and practicality of the proposed method.

• Journal of IKEEE
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• v.21 no.4
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• pp.348-352
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• 2017

A lot of researches have done for WSN(Wireless Sensor Networks) authentication. Those are divided by whether using certificates or not for the authentication. In this paper, we proposed certificateless protocol. As simplifying the process of authentication, overall the process become faster and the load of the sensor node is decreased. Using the method we proposed, the energy consumption is decreased. That is because instead using keyed hash authentication code(HMAC) simple one way hash function was used. The study confirmed that it could operate on sensor nodes with extremely limited resources and low processing power.

• Proceedings of the Korea Information Processing Society Conference
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• 2015.10a
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• pp.637-639
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• 2015

TELNET은 사용자가 컴퓨터에 원격 접속할 때 사용하기 위한 프로토콜이다. TELNET은 사용자 계정과 비밀번호 등 모든 데이터를 평문으로 전송하여 기밀성과 무결성이 보장되지 않고 서버를 인증하는 과정이 없어 네트워크 공격에 취약하다는 문제가 있다. 이 문제를 해결하기 위해 Kerberos, SSL/TLS와 같은 보안 프로토콜 기반에서 TELNET을 동작시키거나 SSH을 통해 원격 접속하는 방법이 있다. 하지만 이 방법들은 별도의 보안 프로토콜이 필요하다는 단점이 있다. 본 논문에서는 추가적인 프로토콜을 사용하지 않고 TELNET 자체에서 보안 기능을 지원하는 STELNET(Secured TELNET)을 제안하였다. STELNET에서 클라이언트는 인증서와 전자서명을 이용하여 서버를 인증한다. 이후 서버와 클라이언트는 키 교환을 통해 공유된 키로 암호화 된 데이터와 HMAC을 전송한다. 결과적으로 STELNET은 신뢰하는 서버와의 접속을 지원해주고, 데이터의 암호화로 기밀성을 보장하며 HMAC을 사용하여 무결성을 보장한다.

• Proceedings of the Korean Information Science Society Conference
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• 2004.10a
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• pp.406-408
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• 2004

인터넷 보안에 대한 중요성이 나날이 증가하고 있으며. 이러한 인터넷 보안 문제의 해결책으로 개발된 IPSec은 IP 계층에서 보안서비스를 제공하기 위하여 AH와 ESP를 사용하여 보안연계(Security Association) 서비스를 제공한다. 본 논문에서는 32-bit 데이터 베이스를 이용하여 새로운 AES로 채택된 Rijndael 암호 알고리즘과 HMAC-SHA-1 인증 알고리즘을 통합시킨 IPSec 암호 프로세서를 구현하였다. Xilinx ISE 5.2i를 사용하여 VHDL로 설계하였고, ModelSim으로 시뮬레이션 검증을 수행하였으며, Xilinx사의 Vertex XCV1000E로 구현하였다. 본 논문에서 구현한 IPSec 암호 프로세서는 WLAN이나 VPN, Firewall등에 응용될 수 있을 것이다.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.47 no.1
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• pp.25-34
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• 2010

The IEEE 802.16-2004 standard has a security sub-layer in the MAC layer called, Privacy Key Management (PKM). However, several researches have been published to address the security vulnerabilities of IEEE 802.16-2004. After the IEEE 802.16-2004 standard, a new advanced and revised standard was released as the IEEE 802.16e-2005 amendment which is foundation of Mobile WiMAX network supporting handoffs and roaming capabilities. PKMv2 in Mobile WiMAX includes EAP authentication, AES-based authenticated encryption, and CMAC or HMAC message protection. However, Mobile WiMAX still has a problem of security architecture such as a disclosure of security context in network entry, a lack of secure communication in network domain, and a necessity of efficient handover supporting mutual authentication because Mobile WiMAX security has mainly concentrated on between SS and BS communication. Based on the investigation results, we propose a novel mobile WiMAX security architecture, called RObust and Secure MobilE WiMAX (ROSMEX), to prevent the new security vulnerabilities.

• Journal of Internet Computing and Services
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• v.13 no.3
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• pp.31-47
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• 2012

The mobile Virtual Private Network (MVPN) of Internet Engineering Task Force (IETF) is not designed to support NEwork MObility (NEMO) and is not suitable for real-time applications. Therefore, an architecture and protocol which supports VPN in NEMO are needed. In this paper, we proposed the cost-reduced secure mobility management scheme (CR-SeMMS) which is designed for real-time applications in conjunction with VPN and also which is based on the session initiation protocol (SIP). Our scheme is to support MVPN in NEMO, so that the session is well maintained while the entire network is moved. Further, in order to reduce the authentication delay time which considers as a delaying factor in hands-off operations, the signaling time which occurs to maintain the session is shortened through proposing the hands-off scheme adopting an authentication method based on HMAC based One Time Password (HOTP). Finally, our simulation results show the improvement of the average hands-off performance time between our proposed scheme and the existing schemes.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2007.10a
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• pp.701-704
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• 2007

Recently, More and more consumer enjoy the finance service such as settling, account transferring, stocks investment, and so via mobile device. In the mobile environment, data transferring between the devices is formatted as XML. However, the common XML file is exposed to the attack such as hacking and malignity code, to satisfy security of mobile environment is very difficult. The problem is more seriously at the open platform such as WIPI that is developed by our country. So there is enough reason to propose one system to protect the import data. In this paper, we development the system to digital signature and signature the XML document in order to protect data, and the system is observing the recommendation of the XML Signature Syntax and Processing by W3C. When designing and composition the system, we use the digital signature algorithm RSA, DSA, KCDSA, and HMAC, etc. we test the system at the open WIPI platform.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.11 no.1
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• pp.536-551
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• 2017

With the advancement and deployment of leading-edge telecommunication technologies for sensing and collecting, computing related information, Cloud of Things (CoTs) has emerged as a typical application platform that is envisioned to revolutionize the daily activities of human society, such as intelligent transportation, modern logistics, food safety, environmental monitoring, etc. To avoid any possible malicious attack and resource abuse, employing hash functions is widely recognized as one of the most effective approaches for CoTs to achieve message integrity and data authentication. The Whirlpool hash function has served as part of the joint ISO/IEC 10118-3 International Standard by the International Organization for Standardization (ISO) and the International Electrotechnical Commission (IEC). In this paper, we propose an effective differential fault analysis on Whirlpool in the byte-oriented random fault model. The mathematical analysis and experimental results show that 8 random faults on average are required to obtain the current 512-bit message input of whirlpool and the secret key of HMAC-Whirlpool. Our work demonstrates that Whirlpool and HMAC-Whirlpool are both vulnerable to the single byte differential fault analysis. It provides a new reference for the security analysis of the same structure of the hash functions in the CoTs.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.22 no.3
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• pp.557-567
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• 2018

There are currently various file encryption solutions for encrypting and storing files on disk. However, the existing file encryption solutions handle encryption and decryption all at once by file or directory. In this paper, we propose a system call supporting partial encryption function of the file. The user sets the encryption information with the system call interface at a portion where encryption of the file data is desired. And then the user writes file data, the data is encrypted and stored. Also if the user sets decryption information and reads the file data, the necessary part is decrypted by applying the set information. For the proposed system call, It consists of inspection module, management module, encryption module, decryption module, and HMAC module as per required system call. And it was implemented on the Linux environment. Also the operation of implemented system call was verified on the development board, and the performance was analyzed by measuring performance speed.