• Journal of Digital Convergence
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• v.10 no.3
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• pp.155-160
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• 2012

This paper proposes an authentication protocol based on hash and AES safe from various types of attacks in order to assure the security of communication between tags and readers, which exchange data with each other wirelessly in a RFID system. The proposed authentication protocol resolves a problem in existing hash-based protocols whereby the same hidden value is generated for the same identification in each session. In order to hide tag identification information a number of complicated calculations were required, but using the proposed AES protocol reduces such calculations, strengthens security against replay attack, spoofing attack, traffic analysis, eavesdropping, etc. and assure mutual authentication between tags and readers.

• The Journal of Society for e-Business Studies
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• v.13 no.1
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• pp.21-32
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• 2008

RFID systems provide technologies of automatic object identification through wireless communications in invisible ranges and adaptability against various circumstances. These advantages make RFID systems to be applied in various fields of industries and individual life. However, it is difficult to use tags with distinction as tags are increasingly used in life because a tag usually stores only one object identifier in common RFID applications. In addition, RFID systems often make serious violation of privacy caused by various attacks because of their weakness of radio frequency communication. Therefore, information sharing methods among applications are necessary for expansive development of RFID systems. In this paper, we propose efficient RFID scheme. At first, we design a new RFID tag structure which supports many object identifiers of different applications in a tag and allows those applications to access them simultaneously. Secondly, we propose an authentication protocol to support the proposed tag structure. The proposed protocol is designed by considering of robustness against various attacks in low cost RFID systems. Especially, the proposed protocol is focused on efficiency of authentication procedure by considering security levels of applications. In the proposed protocol, each application goes through one of different authentication procedures according to their security levels. Finally, we prove efficiency of th proposed scheme compared with the other schemes through experiments and evaluation.

• 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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• 2008.11a
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• pp.1452-1454
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• 2008

태그의 식별을 DB에 의뢰하는 것에 의존적인 RFID기반 시스템은 리더와 DB가 서로의 통신반경 밖에 있거나 기반 통신망이 없어 DB와 연결이 어려운 환경에서는 응용이 제한적이며, 정상적인 경우에도 병목현상의 가능성을 갖고 있다. 본 논문은 DB가 태그의 인증기능을 리더에게 대리 위임하여 자체적으로 인증을 수행할 수 있는 RFID인증프로토콜을 제안한다. 제안하는 기법은 DB와의 통신범위 제한에 비교적 자유롭고, 리더 자체적으로 태그인증이 가능하며, 부가적으로 DB의 연산부하를 경감시킬 수 있다.

• Journal of the Institute of Electronics Engineers of Korea CI
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• v.42 no.1
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• pp.45-50
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• 2005

Recently, ubiquitous Computing is being actively researched and one of the main technology in ubiquitous computing environments is recognized as RFID system. The RFID system has much benefits but simultaneously has some problems such as user's privacy violation. Therefore, in this paper, we analyze the privacy problems of previous methods and propose more secure and effective authentication method to protect user's privacy. The proposed protocol is secure against replay attack, spoofing attack and tracking by an attacker.

• Proceedings of the Korean Information Science Society Conference
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• 2006.10c
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• pp.560-565
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• 2006

최근 보안에 대한 사회적인 관심이 높아지면서 RFID는 기존의 스마트카드와 바코드 시스템이 갖는 여러 기능적인 한계점들을 극복함으로써 향 후 이를 대체할 보안 신기술로서 인식되고 있다. 현재 사무실 출입의 보안을 위해 대표적으로 사용되고 있는 출입문 인증시스템은 일단 출입문을 통과한 사용자들에 대해서는 사무실 내부의 모든 요소들이 무방비 상태로 노출되어 보안상의 허점이 발생한다. 또한 사무실 내 개개의 PC에 단말기를 설치하여 사용하는 스마트카드 인증시스템 역시도 빈번한 자리 이동에 따른 카드 인증 절차의 번거로움으로 인해 근거리 이동시 PC를 잠그지 않는 경우가 빈번하게 발생함으로써 사용자 PC에 저장된 보안이 필요한 데이터들에 대한 침해 우려가 발생한다. 본 논문에서는 다중사용자 환경에서 각각의 사용자가 소지한 RFID 태그를 이용하여 기존 카드시스템과 같이 복잡한 인증절차가 필요 없고 빈번한 자리 이동이 발생하더라도 추가적인 인증작업이 없이 매번 자동으로 컴퓨터 시스템을 잠금 및 해제시킴으로써 인증과정에 따른 사용자의 부담을 줄일 수 있는 보안시스템을 제시한다. 또한 사용자가 출근과 동시에 매일 일상적으로 반복되는 사무실에서의 컴퓨터 작업에 대한 효율을 높이기 위한 사무 자동화 시스템을 구현한다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• v.9 no.1
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• pp.328-331
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• 2005

In this paper we review the security and privacy problems in the RFID system and briefly describe the research topics to solve these problem. And, we design and implement the tag authentication system to authenticate tags in the RFID system which is composed of PC, reader and passive type tag with low power 8 bit microprocessor.

• Proceedings of the Korea Information Processing Society Conference
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• 2005.11a
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• pp.1007-1010
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• 2005

RFID(Radio Frequency IDentification)란 일정(무선) 주파수 대역을 이용한 자동인식기술로 원거리에서도 대상물을 분석하여 개체의 정보를 읽거나 기록할 수 있는 시스템이다. 현재 RFID기술은 바탕으로 한 유비쿼터스(Ubiquitous)환경 및 물류시스템, 바코드 시스템을 사용하기 힘든 동물 태깅이나 고속도로 요금부과, 도난 방지, 치매환자의 보호관리 등에 사용할 수 있다는 점으로 사회 전반에 걸쳐 그 사용 폭을 넓혀 가고 있다. 그러나 RFID의 낮은 연산능력과 기억능력의 특징상 정보 보안이나 개인의 프라이버시측면에서 여러 문제들을 발생시킨다. 본 논문에서는 기존의 RFID 인증 프로토콜들을 비교 분석하고, 태그와 리더기 사이의 정보 전송 중 공격자에 의한 정보의 변형을 방지하는 RFID 인증 프로토콜을 제안한다.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.14 no.6
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• pp.57-68
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• 2004

Recently, Radio Frequency Identification (RFID) systems stands in the spotlight of industry as a common and useful tool in manufacturing, supply chain management (SCM) and stock management. In the near future, low-cost RFID Electronic Product Code; (EPC) or smart-labels may be a practical replacement for optical barcodes on consumer items. However, manufacturing cheap and small RFID tags, and developing secure RFID authentication Protocols are problems which need to be solved. In spite of advances in semiconductor technology, computation and storage ability of the tag are so limited that it is difficult and too expensive to apply existing crypto-systems to RFID tags. Thus it is necessary to create a new protocol which would require less storage space and lower computation costs and that is secure in the RFID system's environments. In this paper, we propose a RFID authentication protocol that is secure against location tracking and spoofing attacks. Our protocol can be used as a practical solution for privacy protection because it requires less computations in database than the previous RFID authentication protocol.

• Journal of Digital Convergence
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• v.10 no.4
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• pp.229-233
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• 2012

A RFID system is a technology for detecting information on an object through wireless communication between a tag on the object and a reader, and its applications are being expanded to various areas. Because of its wireless communication, however, there are many vulnerabilities in security. Until now, many studies have been executed in order to solve problems related to the security and stability of RFID. In order to resolve vulnerabilities in existing security methods for privacy protection, this study proposed an authentication protocol that uses hash values received from tags and random numbers. When the proposed protocol was implemented, it was safe from various types of attacks between tag and reader and between reader and DB. Furthermore, compared to recently proposed protocols, it could implement a RFID system with enhanced security and less computation in tags.