• Journal of the Korea Institute of Information Security & Cryptology
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• v.21 no.3
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• pp.27-35
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• 2011

Design of Sensor nodes in Wireless Sensor Network(WSN) should be considered some properties as electricity consumption, transmission speed, range, etc., and also be needed the protection against various attacks (e.g., eavesdropping, hacking, leakage of customer's secret data, and denial of services). The stream cipher Rabbit, selected for the final eSTREAM portfolio organized by EU ECRYPT and selected as algorithm in part of ISO/IEC 18033-4 Stream Ciphers on ISO Security Standardization recently, is a high speed stream cipher suitable for WSN. Since the stream cipher Rabbit was evaluated the complexity of side-channel analysis attack as 'Medium' in a theoretical approach, thus the method of power analysis attack to the stream cipher Rabbit and the verification of our method by practical experiments were described in this paper. We implemented the stream cipher Rabbit without countermeasures of power analysis attack on IEEE 802.15.4/ZigBee board with 8-bit RISC AVR microprocessor ATmega128L chip, and performed the experiments of power analysis based on difference of means and template using a Hamming weight model.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.21 no.5
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• pp.35-45
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• 2011

The Salsa20/12 stream cipher selected for the final eSTREAM portfolio has a better performance than software implementation of AES using an 8-bit microprocessor with restricted memory space, In the theoretical approach, the evaluation of exploitable timing vulnerability was 'none' and the complexity of side-channel analysis was 'low', but there is no literature of the practical result of power analysis attack. Thus we propose the correlation power analysis attack method and prove the feasibility of our proposed method by practical experiments, We used an 8-bit RISC AVR microprocessor (ATmegal128L chip) to implement Salsa20/12 stream cipher without any countermeasures, and performed the experiments of power analysis based on Hamming weight model.

• The Journal of the Korea institute of electronic communication sciences
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• v.7 no.5
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• pp.1017-1026
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• 2012

Due to acceleration of the IT industry and the environment for a variety of media in modern society, such as real-time video images 3D-TV is a very important issue. These high-quality live video is being applied to various fields such as CCTV footage has become an important performance parameters. However, these high quality images, even vulnerable because of shortcomings secure channel or by using various security algorithms attempt to get rid of these disadvantages are underway very active. These shortcomings, this study added extra security technologies to reduce the processing speed image processing itself, but by adding security features to transmit real-time processing and security measures for improving the present.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.7 no.3
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• pp.11-22
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• 1997

The number of output sequence was proposed as a characteristic of binary sequence generators for cryptographic application, but in general most of binary sequence generators have single number of output sequence. In this paper, we propose two types of binary sequence generators with a large number of output sequences. The first one is a Switched-Tap LFSR (STLFSR) and it applies to the generalized nonlinear function and the Geffe's generator as example. The other is a generalized memory sequence generator(GMEM-BSG) which is an improved version of the Golic's memory sequence generator (MEM-BSG) with a large number of output sequences, and its period, linear complexity, and the number of output sequence are derived.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.31 no.9C
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• pp.846-852
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• 2006

The ${\kappa}$-error linear complexity is a ky measure of the stability of the sequences used in the areas of communication systems, stream ciphers in cryptology and so on. This paper introduces an efficient algorithm to determine the ${\kappa}$-error linear complexity and the corresponding error vectors of $p^m$-periodic binary sequences, where : is a prime and 2 is a primitive root modulo $p^2$. We also give a new sense about the ${\kappa}$-error linear complexity in viewpoint of coding theory instead of cryptographic results. We present an efficient algorithm for decoding binary cyclic codes of length $p^m$ and derive key properties of the minimum distance of these codes.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.23 no.6
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• pp.989-1000
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• 2013

Mobile devices use VPN solution to transfer information securely through open network in mobile office environment. In this paper, we propose Pre_Buffered mechanism that improves the throughput of IPSec VPN using low performance H/W crypto Token. Pre_Buffered method precompute key stream, store them in Buffer and use them in IPSec engine for IP packet processing. Moreover, Design, analysis, and experimental results prove the efficiency and feasibility of our proposed method.

• Proceedings of the Korea Information Processing Society Conference
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• 2006.05a
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• pp.897-900
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• 2006

RFID(Radio Frequency Identification) 기술의 발전은 편의성과 경제성으로 전 세계에 확산되어 사용되고 있다. 비록 세계적인 보안 표준안이 정해 지지 않았지만 RFID 보안 분야는 각 나라에 맞게 표준을 선정하여 적용되고 있다. 한편, RFID 기술의 발전으로 RFID의 칩이 소형화되고, 장거리 통신이 가능해짐에 따라 RFID 시스템에 내장된 정보를 다른 누군가가 활용하여 개인 또는 기업 등의 프라이버시를 불법으로 수집하는 피해가 발생할 수 있다. 본 논문은 RFID 시스템에서 정보의 누출을 막기 위해 해쉬 알고리즘과 초경량 스트림 암호알고리즘을 사용하여 전방위 안전성이 향상된 RFID시스템을 제안, 분석하였다.

• 한국HCI학회:학술대회논문집
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• 2007.02a
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• pp.790-795
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• 2007

최근 유비쿼터스 컴퓨팅에 대한 연구가 활발히 진행되고 있으며 유비쿼터스 컴퓨팅의 실현을 위한 핵심기술로서 RFID 시스템에 대한 연구가 활발히 진행되고 있다. 유비쿼터스 환경에서 RFID 시스템이 사용자의 편리함을 가져다 주는 장점이 있는 반면, 이로 인해 사용자의 프라이버시가 침해 당할 수 있는 문제점 또한 가지고 있다. 본 논문에서 사용자 인증 알고리즘은 새로운 해쉬 함수를 사용하고 그리고 메시지 암호화를 위한 스트림 암호기는 LFSR(Linear Feedback Shift Register)을 사용한다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.29 no.5C
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• pp.595-600
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• 2004

In this paper, we propose a new simple scheme of layered nonlinear feedforward logic (NLFFL) overlaid on a linear feedback shift resistor (LFSR) to generate pseudonoise sequences, which have good balance property and large linear complexity. This method guarantee noiselike statistics without any designed connection scheme e.g. Langford arrangement.

• Journal of Information Technology Services
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• v.3 no.1
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• pp.101-115
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• 2004

The phrase "Ubiquitous Computing" has become popular ever since Mark Weiser used it in an article. It is to realize a computerized environment in which small computers are embedded and cooperate with each other. This environment will support many activities of our daily life. In a Ubiquitous Computing environment, various devices will be connected to the network from houses and buildings. Therefore it is necessary to ensure network security and to protect private data from tapping, falsification and the disguising of identity by others. This study reviews the Ubiquitous Computing technologies in detail and outlines the design concept of the Stream Cipher Algorithm.