• Journal of the Korea Institute of Information Security & Cryptology
• /
• v.18 no.6A
• /
• pp.85-96
• /
• 2008

Neighbor Discovery(ND) protocol is used to exchange an information of the neighboring nodes on the same link in the IPv6 protocol environment. For protecting the ND protocol, firstly utilizing Authentication Header(AH) of the IPsec protocol was proposed. But the method has some problems-uses of key exchange protocol is not available and it is hard to distribute manual keys. And then secondly the SEcure Neighbor Discovery(SEND) protocol which protects all of the ND message with digital signature was proposed. However, the digital signature technology on the basis of public key cryptography system is commonly known as requiring high cost, therefore it is expected that there is performance degradation in terms of the availability. In the paper, to improve performance of the SEND protocol, we proposed a modified CGA(Cryptographically Generated Address) which is made by additionally adding MAC(Media Access Control) address to the input of the hash function. Also, we proposed cache mechanism. We compared performance of the methods by experimentation.

• Journal of the Korea Institute of Information Security & Cryptology
• /
• v.13 no.4
• /
• pp.139-149
• /
• 2003

In this paper a hardware design of area-efficient hash processor which implements MD5 algorithm using hardware sharing and carry-save addition schemes is described. To reduce area, the processor adopts hardware sharing scheme in which 1 step operation is divided into 2 substeps and then each substep is executed using the same hardware. Also to increase clock frequency, three serial additions of substep operation are transformed into two carry-save additions and one carry propagation addition. The MD5 hash processor is designed using 0.25 $\mu\textrm{m}$CMOS technology and consists of about 13,000 gates. From timing simulation results, the designed MD5 hash processor has 465 Mbps hash rates for 512-bit input message data under 120 MHz operating frequency.

• Journal of the Korea Institute of Information Security & Cryptology
• /
• v.16 no.2
• /
• pp.95-103
• /
• 2006

IPv6 is a new version of the Internet protocol, designed as the successor to IPv4. Among the changes from IPv4 to IPv6, we focused on the stateless address auto-configuration mechanism. The address auto-configuration mechanism is used by nodes in an IPv6 network to learn the local topology. The current specifications suggest that IPsec AH may be used to secure the mechanism, but there is no security association during address auto-configuration process because it has no initial IP address. As there are so many suity threats, SEND protocol was designed to counter these threats. In this paper we analyzed the security problems in NDP and SEND protocol. So we proposed the Modified NDP mechanism using PKC and AC in order to solve these problems.

• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.25 no.2
• /
• pp.308-313
• /
• 2021

In this study, tweets about the 2019 Koreas-US DMZ Summit were collected along with a time sequence and analyzed by a sequential topic modeling method, Dynamic Topic Modeling(DTM). In microblogging services such as Twitter, unstructured data that mixes news and an opinion about a single event occurs at the same time on a large scale, and information and reactions are produced in the same message format. Therefore, to grasp a topic trend, the contextual meaning can be found only by performing pattern analysis reflecting the characteristics of sequential data. As a result of calculating the DTM after obtaining the topic coherence score and evaluating the Latent Dirichlet Allocation(LDA), 30 topics related to news reports and opinions were derived, and the probability of occurrence of each topic and keywords were dynamically evolving. In conclusion, the study found that DTM is a suitable model for analyzing the trend of integrated topics in a specific event over time.

• The Journal of the Korea Contents Association
• /
• v.21 no.11
• /
• pp.586-597
• /
• 2021

The purpose of the study is to investigate how females in the 2nd vaccination group(that is, women between the ages of 14-26) perceive cervical cancer, HPV vaccine, and the current campaign on HPV vaccine. In-depth interviews with 19 female college students between the ages of 20-26 revealed that the participants perceive the cervical cancer and vaccine as unimportant due to limited information; they were exposed to related information at random and there were lack of important information; and information provided were viewed as gender-biased. Moreover, social taboo-ness, cost and fear of its side-effects were found to influence women from getting vaccinated. Results show that participants want more fact-based and practical information, information that includes peers and men, as well as a campaign that has more frequent contact and accessibility. Findings of the study can be used for HPV prevention education in the future targeting women between the ages of 13-35. The study provides suggestion for future research and changes needed in HPV vaccine campaigns.

• Annual Conference of KIPS
• /
• 2010.11a
• /
• pp.925-928
• /
• 2010

Wireless sensor networks are composed of a large number of sensor nodes with limited energy resources. One critical issue in wireless sensor networks is how to gather sensed information in an energy efficient way since the energy is limited. The clustering algorithm is a technique used to reduce energy consumption. It can improve the scalability and lifetime of wireless sensor network. In this paper, we introduce a clustering protocol with mode selection (CPMS) for wireless sensor networks. Our scheme improves the performance of BCDCP (Base Station Controlled Dynamic Clustering Protocol) and BIDRP (Base Station Initiated Dynamic Routing Protocol) routing protocol. In CPMS, the base station constructs clusters and makes the head node with highest residual energy send data to base station. Furthermore, we can save the energy of head nodes using modes selection method. The simulation results show that CPMS achieves longer lifetime and more data messages transmissions than current important clustering protocol in wireless sensor networks.

• Journal of Korea Society of Industrial Information Systems
• /
• v.14 no.3
• /
• pp.50-57
• /
• 2009

We propose a network node search scheme to address the network fragmentation due to high node mobility in the VANET. VANET is very similar to MANET in that a multi-hop ad-hoc network is configured by wireless communication between vehicles without any network infrastructure. However, high speed mobility, high node density, and frequent topology change induce frequent network fragmentation so that overall network traffic can be increased. In this paper, new broadcasting protocol called an adaptive relay node search protocol is proposed to decrease the network fragmentation. It reduces the network fragmentation and network traffic by researching nodes outside the dangerous area only in case of network fragmentation. Simulation results show that the proposed protocol decreases network fragmentation by up to 39.9% and increase informed rate by up to 41.9% compared to the existing broadcasting protocol.

• Journal of the Korea Institute of Information Security & Cryptology
• /
• v.33 no.1
• /
• pp.51-61
• /
• 2023

Messengers such as KakaoTalk, LINE, and Facebook Messenger are universal means of communication used by anyone. As the convenience functions provided to users and their usage time increase, so does the user behavior information remaining in the artifacts, which is being used as important evidence from the perspective of digital forensic investigation. However, for security reasons, most of the data is currently stored encrypted. In addition, cover-up behaviors such as intentional manipulation, concealment, and deletion are increasing, causing the problem of delaying digital forensic analysis time. In this paper, we conducted a study on the data decryption and artifacts analysis in a Windows environment for KakaoTalk, the messenger with the largest number of users in Korea. An efficient way of obtaining a decryption key and a method of identifying and decrypting messages attempted to be deleted are presented, and thumbnail artifacts are analyzed.

• The Journal of Korea Institute of Information, Electronics, and Communication Technology
• /
• v.16 no.5
• /
• pp.256-264
• /
• 2023

Smart farm technology using IoT is one of the technologies that can increase productivity and improve the quality of agricultural products in agriculture, which is facing difficulties due to the decline in rural population, lack of rural manpower due to aging, and increase in diseases and pests due to climate change. . Smart farms using existing IoT simply monitor farms, implement smart plant growers, and have automatic greenhouse opening and closing systems. This paper implements a smart farm system based on MQTT, an industry standard protocol for the Internet of Things, and Node-RED, a representative development middleware for the Internet of Things. First, data is extracted from Arduino sensors, and data is collected and transmitted from IoT devices using the MQTT protocol. Then, Node-RED is used to process MQTT messages and store the sensing data in real time in MongoDB, a representative NoSQL, to store the data. Through this smart farm system, farm managers can use a computer or mobile phone to check sensing information on the smart farm in real time, anytime, anywhere, without restrictions on time and space.

• Journal of the Korea Society of Computer and Information
• /
• v.29 no.11
• /
• pp.217-227
• /
• 2024

In this paper, we research an image processing method to provide high-capacity image data in real time through a tactical data link and propose a design applicable to the naval combat management system. Image transmission in a tactical data link is important tactically, but real-time performance is limited using existing transmission methods because Image data is larger than other tactical messages. The proposed method improves real-time performance through image processing before and after image transmission, it was designed to improve transmission speed by reducing image data and transmitting the tactical images obtained from naval combat management system, and to ensure that there are no problems with tactical use by restoring the received images with super resolution. The usefulness of this proposed method was confirmed through simulation, and it is expected that it can be applied to various platforms in the future to greatly increase the effectiveness of utilizing tactical images through tactical data link.