• Journal of Korea Multimedia Society
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• v.15 no.2
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• pp.242-249
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• 2012

Recently, value added location based service and convergence monitoring and control system is growing. The cases include increasing usage of smart-phone for taking picture, wireless network, GPS and digital map. Especially, Smart-phone is appropriate for using image information and location information. However it is possible to be exploited for forgery and manipulation. So we experimented on transferring modified data on the smart-phone as image and location information in EXIF and researched the technology for data verification. In addition, we have designed security monitoring and control prototype considering axis-address matching analysis used geocoding, watermarking verification, encryption.

• Journal of Korea Multimedia Society
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• v.12 no.4
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• pp.540-549
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• 2009

An arbitrary mobile device configures Ad-hoc network to provide the transmission of a data and services using wireless communications. A mobile device requires authentication and encryption key management to securely communicate in the Ad-hoc network. This paper examines the trend of the authentication in the Ad-hoc network and the group key management and suggests the plan for ID-based mutual authentication and group key establishment. ID-based mutual authentication in proposed scheme uses zero knowledge in the absence of shared information and is applied to establish a session key and group key. In addition, the proposed scheme is applied to Ad-hoc network to increase the efficiency and the safety of security technology.

• Journal of the Korea Convergence Society
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• v.6 no.6
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• pp.81-86
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• 2015

The threats to privacy and security have received increasing attention as ubiquitous healthcare applications over the Internet become more prevalent, mobile and universal. In particular, we address the communication security issues of access sharing of health information resources in the ubiquitous healthcare environment. The proposed scheme resolves the sender and data authentication problem in information systems and group communications. We propose a novel key management scheme for generating and distributing cryptographic keys to constituent users to provide form of data encryption method for certain types of data concerning resource constraints for secure communications in the ubiquitous healthcare domains.

• Journal of Korea Multimedia Society
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• v.7 no.7
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• pp.934-943
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• 2004

In this paper, we propose cookie protection-key management system for cookie protection and maintain separate cookie protection-key of each user. We provide integrity, confidentiality, and user authentication of cookie by using registered cookie protection-key and applying encryption techniques. And, we use the technique for hiding the URL of an internal document to a user to minimize the problem of its exposure. When this system is applied to the intranet of an enterprise, it will be able to provide a security to cookie and minimize the problem of internal document exposure by an internal user.

• Journal of Korea Multimedia Society
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• v.6 no.2
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• pp.288-300
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• 2003

As the importance of information security gets recognized seriously, ciphers technology gets used more. Particularly, since public key ciphers are easier to control the key than symmetric key ciphers and also digital signature is easily implemented, public key ciphers are increased used. Nowadays, public key infrastructure is established and operated to use efficiently and securely the public key ciphers. In the public key infrastructure, the user registers at the certificate authority to generate the private key and public key pair and the certificate authority issues the certificate on the public key generated. Through this certificate, key establishment between users is implemented and encryption communication becomes possible. But, control function of session key established in the public key infrastructure is not provided. In this thesis, the certificate issuing protocol to support the key recovery of the session key established during the wireless authentication and key establishment is proposed.

• Journal of Korea Multimedia Society
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• v.10 no.5
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• pp.668-678
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• 2007

The development of a wire and wireless communication technologies might permit easily accessing on various information. But, the easiness of accessing information has basically the problem of an unintended information outflow. An executable file which has key algorithms, data and resources for itself has very weak point in the security. Because the various information such as algorithms, data and resources is included in an executable file on embedded systems or virtual machines, the information outflow problem may appear more seriously. In this paper, we propose a technique which can be protecting the executable file contents for resolving the outflow problem through the encryption. Experimentally, we applied the proposed technique to EVM-the virtual machine for embedded system and verified it. Also, we tried a benchmark test for the proposed technique and obtained reasonable performance overhead.

• Journal of Korea Multimedia Society
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• v.22 no.10
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• pp.1199-1207
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• 2019

Video surveillance data, which is used for preemptive or post-emptive action against any event or accident, is required for monitoring the location, but is reducing the capacity of the image data by removing intervals for cost reduction and system persistence. Such a video surveillance system is fixed in a certain position and monitors the area only within a limited angle, or monitors only the fixed area without changing the angle. At this time, the video surveillance system that is monitored only within a limited angle shows that the variation object such as the floating population shows different status in the image, and the background of the image maintains a generally constant appearance. The static objects in the image do not need to be stored in all the images, unlike the dynamic objects that must be continuously shot, and occupy a storage space other than the necessary ones. In this paper, we propose a mechanism to analyze the image, store only the small size image for the fixed background, and store it as image data only for variable objects.

• Journal of Korea Multimedia Society
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• v.25 no.7
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• pp.922-931
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• 2022

Recently, the need for health information management platforms has been increasing for efficient medical and IT technology research. However, health information is requiring security management by law. When permissioned blockchain technology is used to manage health information, the integrity is provided because only the authenticated users participate in bock generation. However, if the blockchain server is attacked, it is difficult to provide security because user authentication, block generation, and block verification are all performed on the blockchain server. In this paper, therefore, we propose a Health Information Management Server, which uses a permissioned blockchain algorithm and asymmetric cryptography. Health information is managed as a blockchain transaction to maintain the integrity, and the actual data are encrypted with an asymmetric key. Since using a private key kept in the institute local environment, the data confidentiality is maintained, even if the server is attacked. 1,000 transactions were requested, as a result, it was found that the server's average response time was 6,140ms, and the average turnaround time of bock generation was 368ms, which were excellent compared to those of conventional technology. This paper is that a model was proposed to overcome the limitations of permissioned blockchains.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.14 no.4
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• pp.1926-1934
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• 2013

M2M (Machine-to-Machine Communication) refers to technologies that allow wired and wireless systems to communicate with other devices with similar capabilities. M2M has special features which consist of low electricity consumption, cheap expenses, WAN, WLAN and others. Therefore, it can communicate via a network. Also, it can handle itself without a person's management. However, it has a wireless-communicate weakness because of the machine-communicate request, and also it is difficult to administrate and control each other. So In this Paper, It suggests the safety protocol between Device, Gateway and Network Domain in M2M environment. Proposed protocol is based on ID-Based encryption's certificate and creates session key between the Access Server and the Core Server in the Network Domain. It uses that session key for sending and receiving data in mutual, and adds key renewal protocol so it will automatically update discern result. a comparative analysis of the existing M2M communication technologies and PKI-based certificate technology is compared with the proposed protocol efficiency and safety.

• Proceedings of the Korea Institutes of Information Security and Cryptology Conference
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• 2006.06a
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• pp.295-298
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• 2006

인터넷의 발달로 네트워크를 통한 멀티미디어 데이터 서비스가 늘어나면서 유료 콘텐츠에 대한 저작권 관리와 보호 및 다양한 이기종의 단말 장치에 적합한 콘텐츠 적응(adaptation) 서비스에 대한 필요성이 높아지고 있다. 이를 위하여 현재까지 DRM, Scalable Coding, Progressive Encryption, ISMA, ARMS, Metadata Adaptation 등 다양한 연구가 진행되어 왔지만 요구사항을 포괄적으로 만족하는 멀티미디어 전송 프레임워크는 부재한 상태이다. 이에, 본 논문에서는 기존 기법을 분석하고 기능을 통합하여 안전하고 보다 여러 종류의 단말 장치에 서비스가 가능하며 다양한 서비스 형태를 가질 수 있는 프레임워크를 설계하였다. 이를 통해 멀티미디어 서비스가 보다 광범위하게 활용되고 확산 될 수 있으리라 기대된다.