• Proceedings of the CALSEC Conference
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• 1999.11a
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• pp.226-231
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• 1999

■ 디지털 콘텐츠(Digital Contents)란\ulcorner -컴퓨터상에서 Digital(0 또는 1)로 존재 하는 무형 의 데이터(예, 멀티미디어, 영상, MP3, S/W) ■ 디지털 콘텐츠 보호의 필요성 -불법복제 파일의 유통방지 -디지털 저작권 보호, 지적재산권 보호 -사용자 인증, 기밀성, 무결성 ■ 암호학적 방법 -공개키기반구조(PKI), 인증구조(X.509) -전자서명기법 (중략)

• Convergence Security Journal
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• v.10 no.4
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• pp.61-67
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• 2010

Information communication the dazzling development life was convenient with to join in and planned an industrial technical advance. Not only the nation with technical security of the enterprise between the description competition keenly in the present point of view which rushes to technical competitive time of the nation between is become accomplished. The damage which is caused by with outflow of industrial secrecy that company prevents this effectively because is threatening at the degree which will threaten the existence of the nation and the technique which manages is become accomplished with the domestic foreign enemy. Prevents an industrial secret outflow the research for on a large scale with physical security technique and information security to be divided, is researched.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.37 no.4B
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• pp.288-299
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• 2012

To ensure data confidentiality and fine-grained access control in business environment, system model using KP-ABE(Key Policy-Attribute Based Encryption) and PRE(Proxy Re-Encryption) has been proposed recently. However, in previous study, data confidentiality has been effected by decryption right concentrated on cloud server. Also, Yu's work does not consider a access privilege management, so existing work become dangerous to collusion attack between malicious user and cloud server. To resolve this problem, we propose secure system model against collusion attack through dividing data file into header which is sent to privilege manager group and body which is sent to cloud server and prevent modification attack for proxy re-encryption key using d Secret Sharing, We construct protocol model in medical environment.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2010.05a
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• pp.316-319
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• 2010

File security is typically protected by encryption methods. The development of a network environment, such as the Internet according to the sharing of information between systems become commonplace, while providing convenience to users, individuals or organizations that facilitate access to sensitive information caused by hacking the system to attack the rapidly growing is a trend. This paper is the latest generation file system caused by the hacking attacks on the Sniffing for users using file encryption and key generation, Packet Sniffing Tool IP and data through the analysis are discussed. Through this study, the importance of protecting personal information by imprinting Proactive in the hacking incident, and what users will contribute to increase the level of security awareness.

• Journal of Internet Computing and Services
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• v.13 no.5
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• pp.55-64
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• 2012

Nowadays, as Cloud computing becomes popular, a need for a DFS(distributed file system) is increased. But, in the current Cloud computing environments, there is no DFS framework that is sufficient to protect sensitive private information from attackers. Therefore, we designed and proposed a secure scheme for distributed file systems. The scheme provides confidentiality and availability for a distributed file system using a secret sharing method. In this paper, we measured the speed of encryption and decryption for our proposed method, and compared them with that of SEED algorithm which is the most popular algorithm in this field. This comparison showed the computational efficiency of our method. Moreover, the proposed secure read/write model is independent of Hadoop DFS structure so that our modified algorithm can be easily adapted for use in the HDFS. Finally, the proposed model is evaluated theoretically using performance measurement method for distributed secret sharing model.

• Journal of Software Assessment and Valuation
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• v.17 no.1
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• pp.11-16
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• 2021

The importance of software is increasing due to the development of information and communication, and software copyright disputes are also increasing. In this paper, the source of the submitted programs and the files necessary for the execution of the program were taken as the scope of analysis. The large-capacity file transfer solution program to be analyzed provides additional functions such as confidentiality, integrity, user authentication, and non-repudiation functions through digital signature and encryption of data.In this paper, we analyze the program A, program B, and the program C. In order to calculate the program similarity rate, the following contents are analyzed. Analyze the similarity of the package structure, package name, source file name in each package, variable name in source file, function name, function implementation source code, and product environment variable information. It also calculates the overall similarity rate of the program. In order to check the degree of agreement between the package structure and the package name, the similarity was determined by comparing the folder structure. It also analyzes the extent to which the package structure and package name match and the extent to which the source file (class) name within each package matches.

• Proceedings of the Korea Information Processing Society Conference
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• 2017.04a
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• pp.382-383
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• 2017

최근 클라우드 기반의 스토리지 서비스가 지속적으로 성장하고 있다. 클라우드 스토리지 서비스는 데이터의 가용성 및 기밀성을 보장하기 위하여 다양한 암호화 방식을 사용한다. 그러나 기존 암호화 방식은 대용량 데이터 전송 시 처리 및 전송 속도가 저하되는 문제점이 발생한다. 이를 개선하기 위하여 파일 특성을 고려한 효율적인 부분 암호화 알고리즘을 설계하였다.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.10 no.4
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• pp.113-127
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• 2000

It is an essential prior condition that information security of all sorts of administration-information on line for E-Government. Every country including United Slates has been constructing and managing Government PKI(Public Key Infrastructure) of information security of one\`s own authentication, confidentiality, integrity, non-repudiation in administration environment on line for information security base construction of E-Government. In this paper, we present an efficient GPKI(Government PKI) implementation suitable for Korea actual circumstance through study and analysis of superior case such as United State.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.26 no.2
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• pp.359-367
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• 2016

As taking pictures by using smartphones has become more common in society, there are many incidents which are unexpected manipulation of images and leak of confidential information. Because of those incidents, demands that identify forgery/alteration of image file and proves of the original copy is constantly increasing. In general, smartphone saves image file as JPEG form and it has DQT which determines a compression rate of image in a header part of image. There is also DQT in Thumbnail image which inside of JPEG. In previous research, it identified a smartphone which take image by only using DQT, However, the research has low accuracy to identify the devices. There are two main purposes in this research. First, this research will analogize a smartphone and an application that takes a picture, edits and save an image file by testing not only about a DQT information but also a information of Thumbnail image. Second, the research will build a database of DQT and Thumbnail information in JPEG file to find more accurate image file's origin.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.23 no.5
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• pp.831-847
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• 2013

The various types of data are being created in large quantities resulting from the spread of social media and the mobile popularization. Many companies want to obtain valuable business information through the analysis of these large data. As a result, it is a trend to integrate the big data technologies into the company work. Especially, Hadoop is regarded as the most representative big data technology due to its terabytes of storage capacity, inexpensive construction cost, and fast data processing speed. However, the authentication token system of Hadoop Distributed File System(HDFS) for the user authentication is currently vulnerable to the replay attack and the datanode hacking attack. This can cause that the company secrets or the personal information of customers on HDFS are exposed. In this paper, we analyze the possible security threats to HDFS when tokens or datanodes are exposed to the attackers. Finally, we propose the secure authentication protocol in HDFS based on hash chain.