• 한국통신학회논문지
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• 제32권4C호
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• pp.454-461
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• 2007

차세대 컴퓨터는 초경량 이동 컴퓨터로서 작은 크기에 휴대하기 편리하고 사용자가 이동 중이라도 주변의 휴대장치들과 통신하여 동적으로 사용자 상황에 맞는 서비스를 제공한다. 사용자 상황에 맞는 서비스를 제공하기 위해서는 사용자나 컴퓨터의 정보를 보호할 수 있도록 보안의 문제점이 해결되어야 하며, 전원 제약적이고, 시스템 제한적인 초경량 이동 컴퓨팅 환경에 맞는 보안 기술이 필요하다. 본 논문에서는 초경량 이동 컴퓨팅 환경에서 효율적으로 운영 가능한 컴포넌트 기반 미들웨어를 소개하고 미들웨어에서 동적으로 적재 및 실행되는 보안 컴포넌트를 설계하고 구현한다. 구현된 보안 컴포넌트는 RC5 알고리즘을 이용한 암호화 기술과 SHA-1 알고리즘을 이용한 인증 기술을 포함한다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제13권4호
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• pp.1941-1960
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• 2019

Unmanned aerial vehicles (UAVs), acting as mobile base stations (BSs), can be deployed in the typical fifth-generation mobile communications (5G) scenarios for the purpose of substantially enhancing the radio coverage. Meanwhile, UAV aided underlay device-to-device (D2D) communication mode can be activated for further improving the capacity of the 5G networks. However, this UAV aided D2D communication system is more vulnerable to eavesdropping attacks, resulting in security risks. In this paper, the D2D receivers work in full-duplex (FD) mode, which improves the security of the network by enabling these legitimate users to receive their useful information and transmit jamming signal to the eavesdropper simultaneously (with the same frequency band). The security communication under the UAV coverage is evaluated, showing that the system's (security) capacity can be substantially improved by taking advantage of the flexible radio coverage of UAVs. Furthermore, the closed-form expressions for the coverage probabilities are derived, showing that the cellular users (CUs)' secure coverage probability in downlink transmission is mainly impacted by the following three factors: its communication area, the relative position with UAV, and its eavesdroppers. In addition, it is observed that the D2D users or DUs' secure coverage probability is relevant to state of the UAV. The system's secure capacity can be substantially improved by adaptively changing the UAV's position as well as coverage.

• International Journal of Internet, Broadcasting and Communication
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• 제8권1호
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• pp.7-18
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• 2016

Several authentication methods have been developed to make use of tokens in the mobile networks and smart payment systems. Token used in smart payment system is genearated in place of Primary Account Number. The use of token in each payment transaction is advantageous because the token authentication prevents enemy from intercepting credit card number over the network. Existing token authentication methods work together with the cryptogram, which is computed using the shared key that is provisioned by the token service provider. Long lifetime and repeated use of shared key cause potential brawback related to its vulnerability against the brute-force attack. This paper proposes a per-transaction shared key mechanism, where the per-transaction key is agreed between the mobile device and token service provider for each smart payment transaction. From server viewpoint, per-transaction key list is easy to handle because the per-transaction key has short lifetime below a couple of seconds and the server does not need to maintain the state for the mobile device. We analyze the optimum size of the per-transaction shared key which satisfy the requirements for transaction latency and security strength for secure payment transactions.

• 한국통신학회논문지
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• 제28권10B호
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• pp.916-926
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• 2003

본 논문에서는 VoIP의 보안을 위하여 적용된 암호화와 보안 적용 방식이 실시간 통신에 미치는 영향을 알아보기 위해 암호화에 주로 사용되는 DES, 3DES, SEED, AES 등의 암호 알고리즘을 VoIP에 적용한 후 지터나 RTT, 패킷 손실률 등의 여러 가지 QoS 요소를 측정하여 보았다. 또한 각 알고리즘별 암$.$복호화 전과 후의 패킷처리 시간 간격을 측정하여 암호화로 인한 시간 간격의 변화를 알아보았고, 음성으로 재생되기 직전의 처리 시간 간격을 측정하여 각 패킷이 어느 정도 주기적으로 공급되는지 여부와 실제 음질을 비교하여 보았다. 또한 대표적인 실시간 멀티미디어 보안 프로토콜인 H.235와 SRTP에서의 RTP 보안 적용 방식을 비교하여 키 교환 및 보안성과 공격 방어 측면 그리고 RTP 보안 적용의 효율성 등을 분석하였다.

• Journal of Information Processing Systems
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• 제7권1호
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• pp.111-120
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• 2011

The concept of Smart-Homes is becoming more and more popular. It is anticipated that Radio Frequency IDentification (RFID) technology will play a major role in such environments. We can find many previously proposed schemes that focus solely on: authentication between the RFID tags and readers, and user privacy protection from malicious readers. There has also been much talk of a very popular RFID application: a refrigerator/bookshelf that can scan and list out the details of its items on its display screen. Realizing such an application is not as straight forward as it seems to be, especially in securely deploying such RFID-based applications in a smart home environment. Therefore this paper describes some of the RFID-based applications that are applicable to smart home environments. We then identify their related privacy and security threats and security requirements and also propose a secure approach, where RFID-tagged consumer items, RFID-reader enabled appliances (e.g., refrigerators), and RFID-based applications would securely interact among one another. At the moment our approach is just a conceptual idea, but it sheds light on very important security issues related to RFID-based applications that are beneficial for consumers.

• 한국재난정보학회 논문집
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• 제4권2호
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• pp.40-50
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• 2008

The purpose of this study is to analyze the job of the security and secretary, to offer useful basic data throughout human resources management by withdrawing the ability required from the security and secretary based on the analyzed results. In this regard, this study intended to look into the job of the security and secretary, the necessary ability for the job of the security and secretary. To achieve the research goals, the study selected the research participants, composed of 5 secretaries for security with more than 5-year careers after graduating from a security and secretarial service department in a college and conducted an in-depth interview with them concerning their jobs. The in-depth interview data from the 5 participants was applied with a classification analysis used by Spradley (1980). In order to enhance the dependability and validity of the research, the study held an expert meeting composed of 2 persons with a doctoral degree in securities service studies and 1 person with a master's degree in secretarial information studies, twice. Also, the study drew results concerning the job of the security and secretary and the necessary ability of the job. Though the above process, the following conclusions were drawn; the job of the security and secretary includes the areas of job safety, a housing residence job, a health care job, an interpersonal relationships job, an assistant' s job, document and office works, general affairs, and an education job. The necessary ability for the job of the security and secretary involves martial arts abilities, risk management ability, the strict keeping of secrets, decision-making ability, information processing ability, foreign language proficiency, understanding other cultures, communications skills and office work ability.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2004년도 ICEIC The International Conference on Electronics Informations and Communications
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• pp.321-324
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• 2004

A VPN is widely used in a communications environment which access is controlled to permit peer connections only within a defined community of interest. It is constructed through some form of partitioning of a common underlying communication medium, where this underlying communications medium provides services to the network on a non-exclusive basis. In this paper, we have analyzed a variety of architecture to implement Giga bps VPN system. The proposed architecture will satisfy the needs of clients who adopt Giga bps VPN system in the various environments.

• 한국통신학회논문지
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• 제42권4호
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• pp.838-847
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• 2017

최근 마이크로소프트사의 CAPI를 대체하기 위해 제안된 CNG는 플러그인 구조 기반의 독립된 모듈들로 구성되어 있기 때문에 개발비용과 확장 용이성 부분에서 우수하다. 하지만 이러한 이점과 반대로 보안성에 대한 고려는 다소 부족하며, 현재 CNG가 배포되어 활용되고 있는 상황에서 이와 관련된 연구는 반드시 필요하다. 이에 본 논문에서는 CNG에서 발생 가능한 보안 취약점을 분석하였다. 분석된 취약점을 토대로 개념 검증 도구를 구현하여 이를 검증하였다. 검증 결과는 CNG를 활용하는 Outlook 프로그램과 Internet Explorer 프로그램에서 메일 및 계정정보의 탈취, Amazon, E-bay, Google, Facebook 웹 사이트의 계정정보의 탈취가 가능하였다. 본 논문의 결과는 CNG를 활용하는 다양한 응용의 보안성을 향상시키는데 기여할 것으로 사료된다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제7권8호
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• pp.2042-2060
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• 2013

In wireless sensor networks (WSNs), energy efficiency is one of the most essential design considerations, since sensor nodes are resource constrained. Group communication can reduce WSNs communication overhead by sending a message to multiple nodes in one packet. In this paper, in order to simultaneously resolve the transmission security and scalability in WSNs group communications, we propose a hierarchical cluster-based secure and scalable group key management scheme, called HRKT, based on logic key tree and route key tree structure. The HRKT scheme divides the group key into cluster head key and cluster key. The cluster head generates a route key tree according to the route topology of the cluster. This hierarchical key structure facilitates local secure communications taking advantage of the fact that the nodes at a contiguous place usually communicate with each other more frequently. In HRKT scheme, the key updates are confined in a cluster, so the cost of the key updates is reduced efficiently, especially in the case of massive membership changes. The security analysis shows that the HRKT scheme meets the requirements of group communication. In addition, performance simulation results also demonstrate its efficiency in terms of low storage and flexibility when membership changes massively.

• International Journal of Computer Science & Network Security
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• 제21권5호
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• pp.73-83
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• 2021

The information space, the main components of which are information resources, means of information interaction, and information infrastructure, is a sphere of modern social life in which information communications play a leading role. The objective process is the gradual but stable entry of the national information space into the European and world information sphere, in the context of which there is a legitimate question of its protection as one of the components of the national security of Ukraine. However, the implementation of this issue in practice immediately faces the need to respect the rights and fundamental freedoms guaranteed by international regulations and the Constitution of Ukraine, especially in the field of cybersecurity. The peculiarity of the modern economy is related to its informational nature, which affects the sharp increase in cyber incidents in the field of information security, which is widespread and threatening and affects a wide range of private, corporate, and public interests. The problem of forming an effective information security system is exacerbated by the spread of cybercrime as a leading threat to information security both in Ukraine and around the world. The purpose of this study is to analyze the state of cybersecurity and on this basis to identify new areas of the fight against cybercrime in Ukraine. Methods: the study is based on an extensive regulatory framework, which primarily consists of regulatory acts of Ukraine. The main methods were inductions and deductions, generalizations, statistical, comparative, and system-structural analysis, grouping, descriptive statistics, interstate comparisons, and graphical methods. Results. It is noted that a very important component of Ukraine's national security is the concept of "information terrorism", which includes cyberterrorism and media terrorism that will require its introduction into the law. An assessment of the state of cybersecurity in Ukraine is given. Based on the trend analysis, further growth of cybercrimes was predicted, and ABC analysis showed the existence of problems in the field of security of payment systems. Insufficient accounting of cybercrime and the absence in the current legislation of all relevant components of cybersecurity does not allow the definition of a holistic system of counteraction. Therefore, the proposed new legal norms in the field of information security take into account modern research in the field of promising areas of information technology development and the latest algorithms for creating media content.