• Journal of Internet Computing and Services
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• v.17 no.3
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• pp.55-66
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• 2016

A local storage of HTML5 is a Web Storage, which is stored permanently on a local computer in the form of files. The contents of the storage can be easily accessed and modified because it is stored as plaintext. Moreover, because the internet browser classifies the local storages of each domain using file names, the malicious attacker can abuse victim's local storage files by changing file names. In the paper, we propose a scheme to maintain the integrity and the confidentiality of the local storage's source domain and source device. The key idea is that the client encrypts the data stored in the local storage with cipher key, which is managed by the web server. On the step of requesting the cipher key, the web server authenticates whether the client is legal source of local storage or not. Finally, we showed that our method can detect an abnormal access to the local storage through experiments according to the proposed method.

• Journal of Korea Multimedia Society
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• v.15 no.5
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• pp.651-663
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• 2012

Networked digital signage downloads necessary multimedia contents from a large-sized storage on WAN to its local disk of a limited size before starting their playback. If the required time to download the entire contents gets longer, a start time to play the contents at the digital signage could be delayed. In this paper, we propose a hybrid storage architecture that not only inserts an iSCSI storage layer between the existing local disk and the WAN storage, but offers a contents caching scheme in order to obtain all the necessary contents in digital signage rapidly. The proposed caching scheme determines how to place the downloaded contents both in the local disk and the iSCSI storage. Uniquely, the proposed caching scheme manages the iSCSI storage space by dividing it into two regions: (1) in one region, the digital signage can play the contents directly without downloading them into the local disk; (2) in the other region, the digital signage cannot. Performance evaluations on a simulator and an actual system with workloads of various contents show that a contents-downloading time of the hybrid storage architecture is at maximum three times shorter than that of the existing storage architecture.

• Proceedings of the Korea Multimedia Society Conference
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• 2012.05a
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• pp.270-271
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• 2012

일반적인 네트워크 디지털 사이니지의 경우 모든 콘텐츠를 WAN상에 있는 대용량 스토리지에 보관을 하고 있으며, 필요한 멀티미디어 콘텐츠가 있을 경우 제한적인 로컬디스크에 다운로드 한 후에 재생 작업을 수행한다. 필요한 멀티미디어 콘텐츠의 신속한 확보를 위해 기존의 로컬디스크와 WAN 스토리지 사이에 콘텐츠 캐싱 기법을 포함하는 iSCSI 스토리지 계층이 추가된 하이브리드 스토리지 구조를 제안한다.

• 한국정보통신설비학회:학술대회논문집
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• 2004.08a
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• pp.132-136
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• 2004

본 논문은 SDP(Software Define Platform)와 연동하여 홈 네트워킹에 필요한 정보를 저장하고 검색하는 홈 네트워크 저장장치인 능동형 미디어 스토리지 플랫폼 연구에 관해 기술한다. 능동형 미디어 스토리지 플랫폼은 단순한 데이터 저장 뿐만 아니라 SDP가 요구하는 정보를 어플리케이션에 따라 다르게 처리할 수 있다. 또한 멀티미디어 스트림을 로컬 네트워크상에 최적화하여 어플리케이션에 제공한다.

• Journal of Internet Computing and Services
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• v.13 no.4
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• pp.83-93
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• 2012

HTML5 has developed not to have browser dependancy considering interoperability as same as maintaining compatability with lower versions of HTML. HTML5, the newest web standardization is on going of being structured. Along with the smart phone boom, HTML5 is spotlighted because it can be applied to cross platforms in mobile web environments. Specially the local Storage that has been listed in new features in HTML5 supports offline function for web application that enables web application to be run even when the mobile is not connected to 3G or wifi. With Local storage, development of server-independent web application can be possible. However Local storage stores plaintext data in it without applying any security measure and this makes the plaintext data dangerous to security threats that are already exist in other client side storages like Cookie. In the paper we propose secure Local storage methods to offer a safe way to store and retrieve data in Local storage guaranteeing its performance. Suggested functions in this paper follow localStorage standard API and use a module that provide cryptographic function. We also prove the efficiency of suggested secure Local storage based on its performance evaluation with implementation.

• Journal of The Institute of Information and Telecommunication Facilities Engineering
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• v.3 no.1
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• pp.34-45
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• 2004

홈네트워크 및 유비쿼터스 환경 도래로 인하여 디지털 기기의 데이터량이 급증하고 있고 이에 따라 가정 내 저장공간이 요구된다. 본 논문은 다양한 디지털 기술의 융합을 통한 홈 네트워크 기반의 능동형 미디어 스토리지 개발에 관한 내용을 고찰한다. 연구/개발된 능동형 미디어 스토리지는 SDP와 연동하여 홈네트워킹에 필요한 정보를 저장하여 SDP가 요구하는 정보를 어플리케이션에 따라 다르게 처리한다. 또한 멀티미디어 데이터를 로컬 네트워크 상에 최적화하여 어플리케이션에 제공한다. 또한 가정 내 디지털 기기의 정보저장 허브 역할을 수행한다.

• Journal of Korea Multimedia Society
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• v.10 no.1
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• pp.74-82
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• 2007

IPv6 is the internet protocol for next generation which can solve the problem of IPv4 protocol. Mobile IPv6 efficiently provides the mobility for mobile devices holding the properties of IPv6. iSCSI(Internet Small Computer System Interface) is a block-oriented storage access protocol that enables a user to recognize a remote storage as their own local block device through general TCP/IP networks. Since iSCSI uses a standard Ethernet switch and router for this kind of access, it can not only be applized to Ethernet technologies, but can also be used to create a storage networking system without any distance restrictions that can equally be applied to a wireless network environment. Accordingly, this paper presents an alternative approach to overcome the limited storage space of mobile devices based on the IPv6 iSCSI initiator driver which was originally designed for wired networks. Also, this paper describes about the implementation and performance analysis of mobile education service system using virtual storage devices in IPv6 wireless networks.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.30 no.6A
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• pp.517-525
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• 2005

iSCSI(Internet Small Computer System Interface) is a block-oriented storage access protocol that enables a user to recognize a remote storage as their own local block device through general TCP/IP networks. Since iSCSI uses a standard ethernet switch and router for this kind of access, it can not only be applied to ethernet technologies, but can also be used to create a storage networking system without any distance restrictions that can equally be applied to a wireless network environment. Accordingly, focusing on this applicability, this paper presents an alternative approach to overcome the limited storage space of mobile devices based on the iSCSI initiator driver, which was originally designed for wired networks. Additionally, its potential with a wireless network is also evaluated.

• Journal of Korea Society of Industrial Information Systems
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• v.17 no.2
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• pp.33-43
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• 2012

Digital signage is referred to as a smart electronic display system that delivers multimedia-based information and advertisements to customers. Typically, the digital signage starts its playback after downloading a list of multimedia contents from network storage to its local disk. However, a way of downloading the entire contents before its playback entails a long initial delay time. In this paper, we formulate a problem of the initial delay time and provide a solution to compute a minimally demanded initial delay time according to a given network bandwidth and qualities/sizes of the multimedia contents. In addition, we analyze the performance of the proposed solution with various multimedia contents on digital signage.

• Review of KIISC
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• v.22 no.7
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• pp.7-13
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• 2012

클라우드 컴퓨팅은 네트워크, 스토리지, 서버, 응용프로그램 등과 같은 컴퓨팅 자원에 언제든지 편리하게 접근할 수 있는 새로운 컴퓨팅 모델이다. 클라우드 컴퓨팅은 기존의 컴퓨팅 환경과 다르게 다양한 단말 기기를 통해 접속할 수 있고, 사용자의 데이터를 로컬이 아닌 원격지에 저장하며, 작업 상태를 실시간으로 업데이트한다는 특징이 있다. 클라우드 컴퓨팅 환경에서 사용자의 데이터가 원격지에 존재하고, 서비스 제공자에 의해 관리되기 때문에 데이터 보안의 관점에서 위협 요소가 있을 수 있다. 또한 범죄와 관련된 데이터가 클라우드 시스템에 저장되어 있을 수 있다. 이를 조사하기 위해서 클라우드 컴퓨팅 환경에 적합한 디지털 포렌식 조사 절차와 방법이 필요하다. 본 논문에서는 디지털 포렌식 관점에서의 클라우드 컴퓨팅에 대해 설명한다. 또한 클라우드 포렌식 기술 동향과 클라우드 컴퓨팅 환경에서 발생하는 법적 이슈 동향을 살펴본다. 이를 바탕으로 향후 클라우드 컴퓨팅 포렌식 연구 방향에 대해서 제시한다.