• Proceedings of the Korean Information Science Society Conference
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• 2008.06a
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• pp.140-145
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• 2008

최근 바코드를 대신하여 많이 사용되는 RFID의 상용화와 이에 관련된 기술에 대한 연구가 활발히 진행되고 있다. 하지만 RF를 이용한 기술은 구조적 특성상 프로톨콜이 노출 되는 문제점이 발생한다. 또한 광범위한 지역에서 RFID사용과 임시적인 RFID사용은 비용상 문제점이 있다. 본 논문은 RFID의 요소 중 DB(Server)를 제외한 리더와 태그 간의 통신을 통한 인증 프로토콜을 제안한다. 또한 리더와 태크만의 구성으로 비용을 절감하고자 하며, AVISPA를 이용하여 제안한 프로토콜의 안전성을 검증 한다.

• Proceedings of the KAIS Fall Conference
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• 2008.05a
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• pp.215-217
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• 2008

RFID 시스템은 향후 바코드를 대체하고 우리 생활 전반에 걸쳐 사용될 획기적인 시스템 이지만 태그의 정보가 외부에 노출될 경우 심각한 문제가 발생 할 수 있다. 본 논문에서는 여러 보안 문제중 프라이버시 보호를 위해 RBAC 기반으로 리더의 권한을 배분하여 태그가 데이터를 선별적으로 전송하고 태그가 리더로부터 수신한 난수로부터 매 세션마다 비밀키 및 실시간으로 새로운 해쉬 함수를 생성하는 인증 프로토콜을 제안한다. 제안된 RBAC를 이용한 해쉬 기반 인증 프로토콜은 각종 공격에 대해 안전하며 연산을 최소화하여 다양한 적용성을 제공한다.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.11 no.4
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• pp.61-68
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• 2011

Recently arithmetic circuit of lightweight AES symmetric key algorithm that can apply to passive tag have been developed, then security protocol of RFID system using AES symmetric encryption techniques have been proposed. This paper proposed security enhancement protocol of RFID system using lightweight AES arithmetic circuit and random number generator of passive tag. The proposed protocol have AES algorithm and random number generator at server, reader, tag, and transmit encrypted message by separate secret key using random number at each session. The mutual authentication of tag and reader used reader random number and tag random number. As a result, proposal protocol reduce authentication steps of the existing mutual authentication protocol, and reduce amount of computation of tag, and demonstrate as secure protocol to every attack type of attacker by decrease communication step of Air Zone.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.20 no.2
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• pp.73-90
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• 2010

Recently, Tan et al. introduced a serverless search protocol in which a mobile reader maintains a tag authentication list and authenticates a tag using the list without connecting authentication server. A serverless RFID system is different from general RFID systems which use on-line server models. In the serverless RFID system, since the mobility of a personalized reader must be considered, we have to protect not only the privacy of a tag but also the privacy of a mobile reader. In this paper, we define new security requirements for serverless RFID search system and propose a secure serverless RFID search system. In our system, since tag authentication information maintained by a reader is updated in every session, we can provide the backward untraceability of a mobile reader. Also we use an encrypted timestamp to block a replay attack which is major weakness of search protocols. In addition, we define a new adversary model to analyze a serverless RFID search system and prove the security of our proposed system using the model.

• Proceedings of the Korea Information Processing Society Conference
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• 2009.04a
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• pp.1436-1437
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• 2009

RFID 시스템에서 리더와 태그간의 통신은 안전하지 않은 채널을 통하여 수행된다. 최근 Lee등은 해쉬 함수와 동기화된 비밀 정보를 이용한 RFID 상호 인증 프로토콜인 LAK 프로토콜을 제안하였다. 하지만 Cao-Shen은 LAK 프로토콜이 재전송 공격에 취약하며, 공격자가 합법적인 태그로 위장할 수 있음을 증명하였다. 본 논문에서는 안전한 일방향 해쉬 함수를 기반의 새로운 2-패스 RFID 상호 인증 프로토콜인 TRMA 프로토콜을 제안한다. 제안한 TRMA 프로토콜은 RFID 태그와 리더 간에 2라운드만을 수행하여 상호 인증을 수행할 수 있으며, 여러가지 공격들에 안전하며 통신 효율성을 보장한다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.19 no.4
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• pp.807-812
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• 2015

In RFID system, when multiple tags respond simultaneously, a collision can occur. A method that solves this collision is referred as anti-collision algorithm. In 13.56MHz RFID system of Auto-ID center, STAC protocol is defined as an anti-collision algorithm for multiple tag reading. The PS algorithm divides the tags within the identification range of reader into smaller groups by increasing the transmission power incrementally and identifies them. In this paper, we propose a STAC/PS algorithm that the PS algorithm is applied in the STAC protocol. Through simulations, it is demonstrated that the collision rate for the proposed algorithm is about 50% lower than STAC protocol. Therefore, the STAC/PS algorithm can achieve faster tag identification speed compared with STAC protocol due to the low collision rate.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.10 no.11
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• pp.3399-3404
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• 2009

RFID system, which tries to identify a information of the tag using the wireless transmission, has been used to recognize long distance. However, each RFID system uses different way for individual needs. So, it is might not be compatible with the each system using a little different way. Also there is a trouble to freely use the protocols between the one tag and the other reader. So we tested a various RFID tags and readers to use the designed system with several protocols. Therefore, this paper shows that we designed and realized of the testing system for RF characteristics test as well as protocol analysis.

• Proceedings of the Korea Information Processing Society Conference
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• 2008.11a
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• pp.1550-1553
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• 2008

RFID처럼 개방형 네트워크의 특성상 프로톨콜이 노출 되는 문제점이 발생한다. 또한 광범위한 지역에서 RFID사용과 임시적인 RFID사용은 비용 상 문제점이 있다. 본 논문은 RFID의 요소 중 DB(Server)를 제외한 리더와 태그 간의 통신을 통한 인증 프로토콜을 제안하며, 악의적인 사용자에 의해서 이용될 수 있는 정보노출의 문제점을 해결하기 위해 기존 제안된 방식에서 프로토콜의 단계를 고려한 프로토콜을 제안한다. 또한 리더와 태그만의 구성으로 비용을 절감하고자 하며, AVISPA를 이용하여 제안한 프로토콜의 안전성을 검증 한다

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2009.05a
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• pp.95-98
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• 2009

RFID(Radio Frequency IDentification) technology is an automatic identification method using radio frequencies between RFID reader which collects the informatin and tag which transmits the information. RFID technology develops passive RFID which transmit the only ID to active RFID which transmit the additional information such as sensing information. there is ISO/IEC 18000-7 as typical standard of active RFID. it is single channel system of 433.92MHz and has limitation of collection of a number of tags. to overcome limitation of collection of many tags, we propose the new 2.4GHz active RFID technology which can use the multi-channel. if reader has multi-interface and uses another channel in each, reader could fast collect the tags. but, if a reader which has many interfaces collects tags through the specific interface, the performance may not improve any more comparing with a reader using single interface. in this paper, we show the fast collection through design and implementation of protocol for load balancing between interfaces in multi-interface RFID reader.

• Journal of the Korea Society of Computer and Information
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• v.15 no.9
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• pp.109-117
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• 2010

Recently, study on RFID Tag Searching technique which is used to find a specific tag in particular tag group were developed continuously. RFID tag searching technique can be applicate in various fields such as product management, finding children, and electronic anklet. To implement a RFID tag search system, RFID tag searching protocol should be considered various security threats such as reader and tag tracking, privacy, etc. For implementing a safe RFID tag lookup system, it is important to consider the potential security threats such as the tag tracking problem, and the privacy of the owner of the tag reader problem. There exists an RFID tag lookup system that satisfies a few security requirements, but the privacy of the owner of the tag reader problem has still been left unsolved, and even if it were solved, it requires a considerable amount of cryptographic operations to be performed which results in a decrease in performance. This paper proposes a system that does not degrade the performance while solving the privacy of the owner of the tag reader problem.