• Journal of the Korea Institute of Information and Communication Engineering
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• v.17 no.3
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• pp.612-618
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• 2013

The file security function, which this paper suggests, restricts the access of an unauthorized users by using password algorithm and saving file. Saved files that are encrypted are read by decrypting them with decryption algorithm. These features are user interface to design the program for user friendly. The security function implements both file encryption and decryption programs and tests whether the experiment works or not. In addition, when a decryption is progressed and the settings of between decryption and encryption are different each other, the security function also checks the possibility of decryption. We can enhance the security on important files stored in Windows servers or personal computers by developing this program.

• Proceedings of the Korea Information Processing Society Conference
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• 2013.05a
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• pp.455-458
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• 2013

본 논문에서 제안하는 파일 보안 기능은 암호알고리즘을 이용하여 윈도우 운영체제에서 파일을 안전하게 저장함으로써 허락되지 않은 사용자의 접근을 제한하도록 한다. 암호화하여 저장된 파일은 복호화 알고리즘으로 복호화해서 파일데이터를 읽게 된다. 이러한 기능은 사용자들이 편리하게 사용할 수 있도록 사용자 인터페이스를 설계하여 프로그램으로 구현한다. 보안 기능으로 구현된 파일 암호화 및 복호화 프로그램을 구동시키고 정상적으로 동작하는지의 여부를 실험하게 된다. 또한 복호화시 암호화 할 때의 설정과 설정이 틀 릴 경우 복호화가 되는지의 여부도 실험한다. 이러한 기능을 편리하게 사용할 수 있도록 Visual Studio 환경을 이용하여 UI(User Interface) 기능을 설계한다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2011.05a
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• pp.660-663
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• 2011

The file security function, which this paper suggests, restricts the access of an unauthorized users by using password algorithm and saving file. Saved files that are encrypted are read by decrypting them with decryption algorithm. These features are user interface to design the program for user friendly. The security function implements both file encryption and decryption programs and tests whether the experiment works or not. In addition, when a decryption is progressed and the settings of between decryption and encryption are different each other, the security function also checks the possibility of decryption. We can enhance the security on important files stored in Windows servers or personal computers by developing this program.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.16 no.3
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• pp.3-16
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• 2006

Encipherment in existing OS(Operating Systems) has typically used the techniques which encrypt and decrypt entirely a secret file at the application level with keys chosen by user In this mechanism it causes much overhead on the performance. However when a security-classified user-process writes a secret file, our proposed mechanism encrypts and stores automatically and efficiently the file by providing transparency to the user at the kernel level of Linux. Also when the user modifies the encrypted secret file, this mechanism decrypts partially the file and encrypts partially the file for restoring. When user reads only the part of the encrypted file, this mechanism decrypts automatically and partially the file. Therefore our proposed mechanism provides user much faster enciphering speed than that of the existing techniques at the application level.

• Proceedings of the Acoustical Society of Korea Conference
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• autumn
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• pp.251-254
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• 2001

본 논문에서는 ETRI와 연세대가 공동 개발한 AAC/MP3 복합 복호화기 ASIC 칩을 이용한 AAC/MP3 오디오 플레이어의 설계 및 구현에 대해 기술한다. 본 논문에서 사용한 AAC/MP3 복합 복호화 ASIC Chip은 20비트 고정소수점 DSP 코어를 이용하여 MP3와 MPEG-2 AAC LC 프로파일을 복호화하며, MPEG-2 AAC 메인 프로파일을 실시간으로 복호화하기 위하여 허프만 복호화 과정과 예측 과정은 전용 하드웨어 모듈을 이용하였다 이를 이용한 오디오 플레이어는 AAC/MP3 파일 재생 기능, USB를 이용한 호스트 PC와의 인터페이스 기능, Flash 메모리와의 인터페이스 기능 등의 특성을 갖는다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.22 no.3
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• pp.557-567
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• 2018

There are currently various file encryption solutions for encrypting and storing files on disk. However, the existing file encryption solutions handle encryption and decryption all at once by file or directory. In this paper, we propose a system call supporting partial encryption function of the file. The user sets the encryption information with the system call interface at a portion where encryption of the file data is desired. And then the user writes file data, the data is encrypted and stored. Also if the user sets decryption information and reads the file data, the necessary part is decrypted by applying the set information. For the proposed system call, It consists of inspection module, management module, encryption module, decryption module, and HMAC module as per required system call. And it was implemented on the Linux environment. Also the operation of implemented system call was verified on the development board, and the performance was analyzed by measuring performance speed.

• Journal of KIISE:Computer Systems and Theory
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• v.35 no.2
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• pp.66-74
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• 2008

Since modem embedded systems need to access, manipulate or store sensitive information, it requires being equipped with cryptographic file systems. However, cryptographic file systems result in poor performance so that they have not been widely adapted to embedded systems. Most cryptographic file systems degrade the performance unnecessarily because of system architecture. This paper proposes ISEA (Indexed and Separated Encryption Approach) that supports for encryption/decryption in system architecture and removes redundant performance loss. ISEA carries out encryption and decryption at different layers according to page cache layer. Encryption is carried out at lower layer than page cache layer while decryption at upper layer. ISEA stores the decrypted data in page cache so that it can be reused in followed I/O request without decryption. ISEA provides page-indexing which divides page cache into cipher blocks and manages it by a block. It decrypts pages partially so that it can eliminate unnecessary decryption. In synthesized experiment of read/write with various cache hit rates, it gives results suggesting that ISEA has improved the performance of encryption file system efficiently.

• Proceedings of the Korea Information Processing Society Conference
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• 2014.11a
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• pp.479-481
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• 2014

개인정보보호법의 개정안이 1년간의 계도 기간을 거쳐 2014년 8월 7일에 시행되었다. 개인정보 보호법은 개인정보보호에 관한 법률이 포함하고 있으며 크게 관리적인 보호조치와 기술적 보호 조치로 구분된다. 본 시스템은 기술적인 보호조치에 해당하며, 개인정보가 포함된 문서를 탐지 및 암 복호화 한다. 개인 정보를 보호하는 방법에 있어서 개인정보에 해당하는 패턴을 정의하고, 상기 패턴을 참조하여 컴퓨터에 저장된 파일에 개인정보가 포함되어 있는가를 검색하며, 정보보호를 위한 암 복호화 동작을 수행하는 정보보호단계를 제공함으로써, 개인정보가 포함되어 있는 파일의 외부 유출을 차단할 수 있을 것으로 기대된다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2017.10a
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• pp.549-551
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• 2017

There are currently various file encryption systems and applications for encryption and storage of file on disk. However, the existing file encryption solutions handle encryption and decryption all at once by file or directory. In this study, we propose a system call supporting partial encryption function of the file. The user sets the partial encryption of the file by using system call interface, and writes the contents. And then the data is encrypted and stored on the disk. Also if the user sets the decryption and reads the data, the necessary part of data is decrypted by applying the user setting. According to the user setting, only the necessary part is encrypted and stored on a storage medium. As a result, the information in a secret level can be saved efficiently and securely.

• Proceedings of the Korea Contents Association Conference
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• 2009.05a
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• pp.510-514
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• 2009

This program was developed in Visual C + +, the Windows operating system has security features within the files and directories. File and directory security, encryption / decryption operations yirueojimyeo file security can be round, to know the value of the key and security password I need to know the directory is designed to be decrypted. In addition, ECB, CBC algorithm and 3DES, SEED algorithms and methods, and encryption. De0 can not run that created the file extension, as has been developed to allow for double security.