• Journal of the Korea Convergence Society
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• v.10 no.3
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• pp.7-14
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• 2019

With the development of information and communication technology, we have been able to access and manage documents containing corporate information anytime and anywhere using smart devices. As the work environment changes to smart work, the scope of information distribution is expanded, and more efforts are needed to manage security. This paper proposes a file sharing system that enables users who have smart devices to manage and share files through mutual cooperation. Proposed file sharing system, the user can add a partner to share files with each other when uploading files kept by spliting the part of the file and the other uses an algorithm to store on the server. After converting the file to be uploaded to base64, it splits it into encrypted files among users, and then transmits it to the server when it wants to share. It is easy to manage and control files using dedicated application to view files and has high security. Using the system developed with proposed algorithm, it is possible to build a system with high efficiency even for SMEs(small and medium-sized enterprises) that can not pay much money for security.

• Smart Media Journal
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• v.12 no.11
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• pp.145-153
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• 2023

In a P2P-based distributed storage system where peers frequently join and leave, it is essential to guarantee not only data availability but also playback quality comparable to that provided by local storage devices when playing back video files with real-time constraints. In addition, cloud storage services based on distributed storage systems provide each user with the functionality to share their files with other users, so when multiple users request playback of the same video file at the same time, all playback should be supported seamlessly in real time. Therefore, in this paper, we propose a scheme that process multiple simultaneous playback requests for each video file in real time as well as data availability in a P2P-based distributed storage system that supports file sharing. This scheme can support real-time simultaneous playback and efficiently use storage space by adjusting the amount of redundant data encoded through erasure coding according to the number of concurrent playback requests for each video file.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.23 no.2
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• pp.193-201
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• 2013

Sharing copyrighted files without copyright holder's permission is illegal. But, a number of illegal file sharers using BitTorrent increase. However, it is difficult to find appropriate digital evidences and legal basis to punish them. And, there are no framework for digital investigation of illegal sharing using BitTorrent. Additionally, role of server in BitTorrent had been reduced than server in conventional P2P. So, It is difficult to apply investigation framework for illegal sharing using conventional P2P to investigation process of illegal sharing using BitTorrent. This paper proposes the methodology about punishing illegal sharer using BitTorrent by suggesting the digital investigation framework.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.15 no.4
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• pp.61-70
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• 2005

We propose and implement a flexible secure peer-to-peer(P2P) file sharing scheme which can be used for data sharing among closed user group (CUG) members. When a member wants to share data, notification messages are sent to the members with whom the member wants to share data. Each notification message includes one-time password encrypted with the receiver's public key. A member who received the notification message can download the data by using the one-time password. The proposed scheme provides selective sharing, download confirmation and efficient storage management. In terms of security, the proposed scheme supports authentication, entity privacy, replay attack protection and disguise prevention. We also implement the proposed system and find that the system is very useful among P2P service of closed user groups.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.17 no.6
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• pp.65-76
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• 2007

The P2P file sharing system sends the results to users by searching the files in the shared folders. In the process of it, the problem is that the transferred information includes the pathname and file information and it can be revealed who searches which files. In related to this problem, anonymous file sharing P2P protocol has been an active research area where a number of works have been produced. However, the previous studies still have a few of weakness. Therefore, We propose two anonymous P2P file sharing protocols based on the decentralized and unstructured Random Walk. The first scheme uses the dynamic onion routing where the requester can receive the wanted file without knowing other peers' IDs. The second scheme uses the IP multicast method which lowers the computational overhead. Both of them are more suited for the dynamic P2P system.

• Proceedings of the Korean Institute of Intelligent Systems Conference
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• 2006.05a
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• pp.327-330
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• 2006

P2P 파일 공유 시스템은 중앙 서버를 거치지 않고 피어 컴퓨터들 간의 직접적인 자원 공유로 특징지워지는 P2P 기술의 대표적인 응용으로, 사용자는 인터넷을 통해 원하는 파일을 쉽게 검색, 획득, 유포할 수 있다. 그러나 악의적인 사용자가 허위 파일이나 바이러스를 유포할 수 있어, 허위파일로 인한 재전송이 빈번해짐으로써 네트워크 트래픽이 증가하고, 바이러스로 인한 피해가 발행할 수 있다. 또한, 자신의 파일에 대한 공유없이 다른 사용자들의 공유 파일만 다운로드하는 free riding 문제가 발생할 수 있다. 이 논문에서는 사용자의 파일 공유 트랜잭션 정보에 기반한 신뢰 정보를 이용하여 P2P 파일 공유 시스템의 문제점을 보완할 수 있는 시스템을 제안한다. 제안한 시스템에서 중앙 서버는 사용자의 파일 공유 트랜잭션 피드백을 이용하여 사용자 신뢰도를 구하여 허위파일이나 바이러스를 유포하는 악의적인 사용자나 free rider에 대해 시스템 사용을 제한한다. 사용자는 파일 다운로드 시에 중앙 서버로부터 사용자 메타데이터를 수신하여 자신의 선호도를 반영한 파일 신뢰도를 이용함으로써 허위파일이나 바이러스를 다운로드할 위험을 줄인다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.10 no.3
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• pp.421-429
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• 2006

Recently, DHT-based Structured P2P System have a attention to scalability and providing efficient lookup by routing. Retrieving content of DHT-based P2P require knowledge of the exact identifier of sharing file. But user may wish to search for sharing file using descriptive keyword or content. To resolve the problem, this paper propose Extended-CAN mechanism to support keyword search. We defined content-based keyword and identifier of sharing file, and PLS extended to KID and CKD for keyword, common keyword processing. As a result, Extended-CAN mechanism provide efficient keyword search for DHT-based Structured P2P System.

• International Commerce and Information Review
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• v.8 no.1
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• pp.205-223
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• 2006

File sharing through P2P was decided as illegal according to Supreme Court of the U.S. and the Highest Court of Korea in 2005. Metro-Goldwyn-Mayer Studios Inc. et al. v. Grokster, LTD., et al. and Soribada v. Korea Association for Music Providers have the same ground for decision. P2P service company has vicarious liability for illegal file sharing of its customers. Balance between copyright protection and development of technology was considered in that decision. Programmer who will develop new program for free download and copyright holders who will exploit every measures to protect their right may compromise for their mutual benefits.

• Journal of Advanced Navigation Technology
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• v.16 no.6
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• pp.968-974
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• 2012

After launched various smart devices such as smart phone and tablet PC, people who using smart devices are provided various services. Especially, contents sharing technology is utilized in any devices. But current contents sharing systems are made on various versions for various smart devices. These methods will be raising cost for development of application. Therefore it must using web technology for reducing cost. In this paper, we had analyzed performance of file transmission using web technology and compared with application based system.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.18 no.5
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• pp.1231-1236
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• 2014

Recently, diffusion and proliferation of mobile devices increases, per person n opens for the mobile device era. Mobile devices and OS types of continuously growing trend. More than 80% of market share with Google's Android and Apple's iOS as well as Samsung and Intel is developing TIZEN, Linux and Mobile was the UBUNTU which UBUNTU for Phone, UBUNTU touch, Mozilla 's Firefox OS, Microsoft 's windows mobile and many more OS are ahead of the launch. But different OS can share files between systems or technology is not. Bluetooth or WIFI Direct such technologies are present but can be transferred between compatible devices low, resulting in constraints file types also exist. In this paper, is equipped with a WiFi card in an environment where the Android mobile OS party this model and method for sharing files between different research and can share the file system based on research on.