• Journal of the Korea Institute of Information Security & Cryptology
• /
• v.17 no.5
• /
• pp.141-146
• /
• 2007

Barcodes have been widely used to implement automatic identification systems but there are various problems such as security weakness or distance restriction in scanning barcode signals in a barcode-based automatic identifcation systems. Recently researchers are gradually interested in radio frequency identification (RFID) and RFID systems have been applied to various fields than before. Especially one of RFID application fields, a bank system uses RFID tagged bankontes to prevent illegal transactions such as counterfeiting banknotes and money laundering. In this paper, we propose a RFID system for protecting location provacy of a banknote holder. In addition, our paper describes that a trust party can trace a counterfeit banknote holder to provide against emergencies.

• Journal of the Korea Institute of Information Security & Cryptology
• /
• v.22 no.6
• /
• pp.1301-1313
• /
• 2012

The importance of protecting personal information is increasing day by day due to invasion of privacy, and data encryption is the most effective way to eliminate it. However, current data encryption methods tend to having problems for applying in practical fields because of critical issues such as low performances and frequent changes of applications. In order to find proper solutions for data security, this paper reviews data encryption technologies and experiments on performance of encrypted data in Oracle Database. On top of that, this paper analyses a data encryption technique not only efficiency of performance but also minimization of application changes.

• Journal of the Korea Institute of Information Security & Cryptology
• /
• v.20 no.6
• /
• pp.271-288
• /
• 2010

In this paper, we study the dysfunctions of cryptography as dual-use goods and national domestic encryption control policies like key recovery system and decryption order. And we examine risks of the breach of the peoples' constitutional rights like the right to privacy in these policies and analyze these policies by applying the principle of the ban on the over-restriction. Finally, we propose the direction and requirements of our national domestic encryption control policy that maintains the balance of peoples' constitutional rights and investigatory powers.

• Journal of the Korea Institute of Information Security & Cryptology
• /
• v.21 no.2
• /
• pp.139-147
• /
• 2011

More convenient and value-added application services can be provided to user in case of using location-based service on Smart phone. However, privacy problem will be happen when an application disclosures the personal location information. Therefore, each user should securely control and manage his own personal location information by specifying access control list and profiles. In this study, we implemented personal location information self-control protocol and developed secure personal location management system with OTP based authentication procedure.

• Journal of Platform Technology
• /
• v.10 no.4
• /
• pp.82-90
• /
• 2022

emerging. And it shows numerous possibilities and tremendous potentials in the virtual world. This metaverse is not limited to one type, but it is evolving and developing into a service in the form of a virtual convergence economy by breaking down boundaries. As a result, various security issues in metaverse are emerging. Metaverse performs all activities in the virtual space, so various problems such as privacy infringement, virtual asset theft, or fraud can occur. In this paper, a service security model is proposed to provide safe services on metaverse. To this end, we analyze security threats in the metaverse framework and propose a security service model to prevent threats. By evaluating the security of the proposed model, it was shown that safe services are effectively possible on the metaverse.

• Annual Conference of KIPS
• /
• 2009.04a
• /
• pp.1478-1481
• /
• 2009

수동형 RFID(Radio Frequency Identification)는 제한된 자원을 가지고 있으며, 무선채널을 사용하는 기술이다. 하지만 도청과 같은 악의적인 공격과 프라이버시 침해와 같은 문제점이 있으며, 이를 해결하기 위한 각종 암호화 기법 및 알고리즘과 인증 프로토콜이 있다. AES(Advanced Encryption Standard)는 RFID에 적용 가능한 대표적인 대칭키 암호화 알고리즘으로써 그 안정성이 검증되었지만, RFID 태그에서 사용하기 위해서는 키 분배와 같은 문제점을 해결하여야 한다. 본 논문에서는 AES와 난수사용을 기반으로 하는 개선된 RFID 인증 프로토콜을 제안한다. 리더에서 발생된 난수는 새로운 키를 생성하고, 태그와 리더를 인증하는 용도로 사용하며, 난수를 통해 생성된 키는 메시지를 암호화 하는데 이용한다. 따라서, 본 논문의 난수사용은 대칭키의 노출을 막아 키 분배 문제를 해결하며, 인증 단계를 줄일 수 있다. 또한, 태그에서 한번의 암호화만 수행되므로 태그에 발생하는 오버헤드를 최소화하며 도청, 재전송, 스푸핑 및 위치 추적과 같은 공격에도 안전하다.

• Annual Conference of KIPS
• /
• 2008.05a
• /
• pp.1112-1115
• /
• 2008

인터넷으로 대표되는 정보통신망 및 컴퓨터를 이용한 개인 정보 수집과 활용이 일반화됨에 따라 수집된 개인정보의 불법적인 접근 유출 사례가 증가하고 있다. 현재의 개인정보 이용 환경은 데이터 접근 시 사용자의 질의 내용과 그에 대한 결과가 그대로 노출되어 사용자의 프라이버시를 침해하는 문제를 안고 있다. 본 논문에서는 데이터베이스에서 개인정보보호를 위해 접근제어 정책 기반 쿼리 처리시스템인 보안 게이트웨이를 설계하고 구현한다. 이 시스템은 클라이언트가 TDS 프로토콜을 이용하여 DBMS에 접근해 정보를 요청할 때 보안 정책을 반영함으로써 단순한 차단은 물론 변환된 쿼리 응답을 한다. 본 시스템은 불법적인 접근에 대한 제어는 물론이고, 정당한 인증자의 실수나 고의적인 개인정보 유출로 인한 경제적, 사회적 손실을 방지할 수 있다. 또한 주민등록번호 등 보안 대상 정보를 제외한 기타 정보에 대한 접근을 허용함으로써 데이터베이스 가용성을 보장한다.

• Journal of Digital Contents Society
• /
• v.13 no.1
• /
• pp.101-110
• /
• 2012

Recently, social network sites are very popular with the enhancement of mobile device function and distribution. This gives rise to the registrations of the people on the social network sites and the usage of services on the social sites is also getting active. However, social network sites' venders do not provide services enough compared to the demand of users' to share contents from diverse roots by users effectively. In addition, the personal information can be revealed improperly in processes sharing policies and it is obvious that it raises a privacy invasion problem when users access the contents created from diverse devices according to the relationship by policies. However, the existing methods for the integration management of social network are weak to solve this problem. Thus, we propose a model to preserve user privacy, categorize contents efficiently, and give the access control permissions at the same time. In this paper, we encrypt policies and the trusted third party classifies the encrypted policies when the social network sites share the generated contents by users. In addition, the proposed model uses the RCBAC model to manage the contents generated by various devices and measures the similarity between relationships after encrypting when the user policies are shared. So, this paper can contribute to preserve user policies and contents from malicious attackers.

• Journal of the Institute of Electronics Engineers of Korea SP
• /
• v.44 no.2 s.314
• /
• pp.27-36
• /
• 2007

Changeable biometrics identify a person using transformed biometric data instead of original biometric data in order to enhance privacy and security in biometrics when biometric data is compromised. In this paper, a novel scheme which generates changeable face templates for statistical appearance-based face recognition is proposed. Two different original face feature vectors are extracted from two different appearance-based approaches, respectively, each original feature vector is normalized, and its elements are re-ordered. Finally a changeable face template is generated by weighted addition between two normalized and scrambled feature vectors. Since the two feature vectors are combined into one by a two to one mapping, the original two feature vectors are not easily recovered from the changeable face template even if the combining rule is known. Also, when we need to make new changeable face template for a person, we change the re-ordering rule for the person and make a new feature vector for the person. Therefore, the security and privacy in biometric system can be enhanced by using the proposed changeable face templates. In our experiments, we analyze the proposed method with respect to performance and security using an AR-face database.

• The KIPS Transactions:PartC
• /
• v.18C no.5
• /
• pp.331-338
• /
• 2011

The RFID system includes a section of wireless communication between the readers and the tags. Because of its vulnerability in terms of security, this part is always targeted by attackers and causes various security problems including the leakage of secret and the invasion of privacy. In response to these problems, various protocols have been proposed, but because many of them have been hardly implementable they have been limited to theoretical description and theorem proving without the accurate verification of their safety. Thus, this study tested whether the protocol proposed by Kenji et al. satisfies security requirements, and identified its vulnerabilities such as the exposure of IDs and messages. In addition, we proposed an improved RFID security protocol that reduced the number of public keys and random numbers. As one of its main characteristics, the proposed protocol was designed to avoid unnecessary calculations and to remove vulnerabilities in terms of security. In order to develop and verify a safe protocol, we tested the protocol using Casper and FDR(Failure Divergence Refinements) and confirmed that the proposed protocol is safe in terms of security. Furthermore, the academic contributions of this study are summarized as follows. First, this study tested the safety of a security protocol through model checking, going beyond theorem proving. Second, this study suggested a more effective method for protocol development through verification using FDR.