• The Transactions of the Korea Information Processing Society
• /
• v.6 no.12
• /
• pp.3597-3605
• /
• 1999

We introduce a new satellite Conditional Access System(CAS) that a subscriber could watch a pay-TV knowing only his or her identity and password, without using a smart card. For this new system, two password-based protocols are presented which not only share a session key and authenticate each other but also download an authorization key. This system has some merits: First, compared with current systems, it reduces the amount of computations by eliminating the AK-encryption module in SMS(Subscriber Management System) and simplifying the receiver's CW-decryption process. Second, since this system does not need an expensive Card Adaptive Device(CAD), it can reduce costs. finally it provides descrambler independence allowing it to be used through any TV set-top box that includes a descrambler, unlike the current system that a descrambler is linked with a smart card.

• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.11 no.12
• /
• pp.2413-2418
• /
• 2007

IN wireless sensor networks (WSNs), one challenging issue is to In wireless sensor networks (WSNs), one challenging issue is to construct a virtual backbone in a distributed and localized way while considering energy limitation. Dominating set has been used extensively as core or virtual backbone in WSNs for the purposes like routing and message broadcast. To ensure network performance, a good dominating set construction protocols should be simple and avoid introducing extra message. In addition, the resulting dominating set should be small, connected, and take into account the energy level at each node. This paper studies efficient and simple virtual backbone construction protocol using defer time in IEEE 802.15.4- based WSNs (e.g. Zigbee). The efficiency of our proposed protocol is confirmed through simulation results.

• Journal of Convergence for Information Technology
• /
• v.7 no.2
• /
• pp.1-9
• /
• 2017

Recently, the DDoS attack using the amplifier method makes it difficult to distinguish the normal traffic from the normal server and it is difficult to detect even the attack detection. Since the SSDP protocol is a common protocol widely used in IoT devices, it is used as a DDoS amplification attack. In this paper, we analyze the reflector attack of SSDP which is one of the DDoS and suggest a technical proposal to detect and defend against the attack by managing the Mac address of each device. Also, we propose a control structure to protect the reflection attack of SSDP in Home IoT. The efficiency of the proposed system has been verified by performing an experimental attack on the virtual environment.

• The Journal of the Institute of Internet, Broadcasting and Communication
• /
• v.18 no.6
• /
• pp.83-90
• /
• 2018

LoRa (Long Range) is a long-distance, low-power communication technology. Broader range of communication than NFC technology allows communication without having to install multiple APs and reduces the cost of initial infrastructure deployment. MQTT (Message, Queuing, Telemetry, Transport) protocol is also low power and lightweight protocols. It can increase module persistence and reduce maintenance costs when used with LoRa. In this paper, we developed a system for compiling various environmental information in a factory using LoRa and MQTT. Environmental sensor data from long distances can be monitored by the management system and the facilities in each workshop can be controlled. Performance tests have also shown that the use of LoRa and MQTT is effective in terms of long-distance and power consumption.

• Journal of the Korea Convergence Society
• /
• v.9 no.11
• /
• pp.45-51
• /
• 2018

Autonomous ship has been sportlighted as a core technology for the maritime industry in Industry 4.0 era. Autonomous ship is expeected to improve the safety, reliability, efficiency and environment significantly. For the realization of the autonomous ship, the remote control of the ship is one of the core functionality in addition to the autonomous ship control functionality in a ship. In this paper, we address a autonomous ship control system based on remote control. This paper proposes a remote control autonomous system and standardized ship-to-shore remote control protocol with for open platform. Finally, we implemented the system and tested with a real experiments with the test ship in order to demonstrate the feasibility of the proposed remote control autonomous system.

• Journal of the Korea Institute of Information Security & Cryptology
• /
• v.19 no.2
• /
• pp.93-103
• /
• 2009

In this paper, we propose a USIM-based Authentication Scheme for 3GPP Network Access. The proposed scheme improves the problems of existing authentication protocol in 3GPP Network such as sequence number synchronization problem, the storage overhead of authentication data, and bandwidth consumption between Serving Network and Home Network. Our proposal is based on the USIM-based Authentication and Key Agreement Protocol that is defined in 3GPP Specification. In our scheme, mobile nodes share a SK with Serving Network and use a time stamp when mobile nodes are performing an authentication procedure with Serving Network. By using time stamp, there is no reason for using sequence number to match the authentication vector between mobile nodes and networks. So, synchronization problem can be solved in our scheme. As well as our scheme uses an authentication vector, the storage overhead of authentication data in Serving Network and bandwidth consumption between networks can be improved.

• Journal of the Korea Institute of Information Security & Cryptology
• /
• v.16 no.3
• /
• pp.29-38
• /
• 2006

Recent advances in wireless communication technology promotes many researches related to sensor network and brings several proposals to fit into various types of sensor network communication. The research direction for sensor network is divided into the method to maximize an energy efficiency and security researches that has not been remarkable so far. To maximize an energy efficiency, the methods to support data aggregation and cluster-head selection algorithm are proposed. To strengthen the security, the methods to support encryption techniques and manage a secret key that is applicable to sensor network are proposed, In. However, the combined method to satisfy both energy efficiency and security is in the shell. This paper is devoted to design the protocol that combines an efficient clustering protocol with key management algorithm that is fit into various types of sensor network communication. This protocol may be applied to sensor network systems that deal with sensitive data.

• Annual Conference of KIPS
• /
• 2011.04a
• /
• pp.254-257
• /
• 2011

IP기반 무선 센서네트워크 기술은 센서노드를 인터넷망과 연동하여 다양한 정보를 수집/관리할 수 있음에도 불구하고 주로 제한된 환경에 설치되기 때문에 노드의 오작동이나 성능 개선이 필요한 경우 인위적인 소프트웨어 업데이트 및 업데이트된 노드의 상태를 파악하고 관리할 필요성이 있다. 소프트웨어 업데이트를 위해 필요한 코드 전파 기법은 매우 중요한 기술 중 하나로서, 본 논문에서는 6LoWPAN 프로토콜에서 제공하는 단편 패킷 전송 기법에 네트워크 코딩 기법을 적용한 새로운 업데이트 코드 전파 기법을 제안한다. 제안된 기법은 기존 단편 패킷 전송방식과 비교하여 패킷 전송의 횟수가 감소되었을 뿐만 아니라, 업데이트 코드 전파를 위한 신뢰성 보장, 전체 네트워크에서 전송에 따른 오버헤드 감소 효과를 보인다. 따라서 본 논문에서 제안한 6LoWPAN 프로토콜상에서 코드업데이트 전파 기법을 적용할 경우 속도, 에너지, 네트워크 혼잡도 측면에서 효율적인 업데이트를 수행할 수 있다. 뿐만 아니라 네트워크 코딩의 overhearing 문제점인 원본 데이터의 분실이나 데이터 미 수신시 발생하는 디코딩문제를 미리 정의된 메시지를 이용, 방지함으로써 신뢰성 있는 데이터 전송이 가능하다.

• Convergence Security Journal
• /
• v.24 no.1
• /
• pp.11-20
• /
• 2024

Recently, smart buildings that can efficiently manage energy using ICT technology and operate and control through the building automation system by collecting data from a large number of IoT sensors in real time are attracting attention. However, as data management is carried out through an open environment, the safety of smart buildings is threatened by the security vulnerability of the existing building automation protocol. Therefore, in this paper, we analyze the major data link technology of BACnet, which is used universally, and propose OWE-based efficient BACnet/SC that can ensure the reliability of data in a wireless environment. The proposed protocol enables safe communication even in an open network by applying OWE and provides the same level of security as BACnet/SC in a TLS environment. As a result, it reduces the connection process twice and reduces the average time required by 40%, enabling more efficient communication than before.

• Proceedings of the Korean Information Science Society Conference
• /
• 2005.11a
• /
• pp.583-585
• /
• 2005

WebDAV 프로토콜은 웹상의 공동 저작활동을 지원하기 위한 IETF 표준으로써, 원거리에 있는 사용자들 간에 파일을 공동 편집하고 관리할 수 있도록 해주는 HTTP 프로토콜의 확장이다. 이것은 웹상에서 가상의 작업공간을 구성함으로써, 원격 사용자들 간에 새로운 방식으로 공동작업을 가능하게 한다. 무선 네트워크 기술과 무선 장치의 발달로 이동을 하면서 WebDAV 서버에 접속한 후 협업을 수행한다면 유선 환경보다 효율적인 협업을 할 수 있을 것이다. 본 논문에서는 .NET Compact Framework 환경에서 동작하는 PDA WebDAV 클라이언트를 설계하였다. 본 클라이언트는 무선 네트워크를 지원하는 환경에서 PDA를 이용하여 WebDAV 서버와 HTTP 요청을 통하여 서버 자원을 확인할 수 있다. 이러한 PDA WebDAV 클라이언트는 PDA 환경에 맞는 인터페이스를 가져야 하고, 또한 WebDAV 명세를 따라야 한다. PDA WebDAV 클라이언트는 공간의 제약을 받지 않는 PDA를 이용함으로써 자료의 효율적인 공유 및 교환을 통하여 능동적인 협업 환경을 구축 할 수 있다.