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

• The Journal of Society for e-Business Studies
• /
• v.7 no.1
• /
• pp.167-186
• /
• 2002

The encryption of a file on a PC before saving can maintain security of the file. However, if the key for the encrypted file is lost or damaged, the encrypted file can not be decrypted, resulting in serious economical loss to the user or the user group. In order to minimize the economical loss a secure and reliable key recovery technology is required. Presented in this paper is the development and evaluation of PKRS (PC based Key Recovery System) which supports encryption and decryption of file and recovery of the encrypted file in emergency. The encapsulating method, which attaches key recovery information to encrypted file, is applied to the PKRS. In addition, the PKRS is developed and evaluated according to the requirements of Requirements for Key Recovery Products proposed by NIST and requirements of Common Criteria 2.0 to prove the safety and reliability of the information security system. This system is applicable to a PC and can be further extended to internet or intranet environment information system where in encryption and recovery of file is possible.

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

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

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

• The Journal of Information Technology
• /
• v.5 no.4
• /
• pp.115-127
• /
• 2002

This paper proposes improved file encryption algorithm which represents image of grayscale type not using proper cover image for ciphertext. This method consists of 3-Tire encryption steps. 1-Tire and 2-Tire encrypt the information using existed stream algorithm and block algorithm with modyfied padding method. We propose the MBE method as 3-Tire, which hides structure and format of encrypted file. The proposed method outputs grayscale file as the result of encryption and since many GSF outputs resulted from different kinds plaintexts, have similar patterns. we obtain both file encryption and hiding the file information. Also, to solve the problem of padding in block algorithm, we propose the new padding algorithm called SELI(Select Insert) and apply 2-Tire block algorithm and MBE algorithm used 3-Tire.

• KSII Transactions on Internet and Information Systems (TIIS)
• /
• v.10 no.4
• /
• pp.1790-1806
• /
• 2016

Digital image encryption is widely used for image data security. JPEG standard compresses image with great performance on reducing file size. Thus, to encrypt an image in JPEG format we should keep the quality of original image and reduced size. This paper proposes a JPEG image encryption scheme based on quantized DC and non-zero AC coefficients inner category scrambling. Instead of coefficient value encryption, the address of coefficient is encrypted to get the address of cipher text. Then 8*8 blocks are shuffled. Chaotic iteration is employed to generate chaotic sequences for address scrambling and block shuffling. Analysis of simulation shows the proposed scheme is resistant to common attacks. Moreover, the proposed method keeps the file size of the encrypted image in an acceptable range compared with the plain text. To enlarge the cipher text possible space and improve the resistance to sophisticated attacks, several additional procedures are further developed. Contrast experiments verify these procedures can refine the proposed scheme and achieve significant improvements.

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

• International Journal of Computer Science & Network Security
• /
• v.21 no.12
• /
• pp.53-60
• /
• 2021

Many standard methods are used for secret text files and secrete short messages cryptography, these methods are efficient when the text to be encrypted is small, and the efficiency will rapidly decrease when increasing the text size, also these methods sometimes have a low level of security, this level will depend on the PK length and sometimes it may be hacked. In this paper, a new method will be introduced to improve the data protection level by using a changeable secrete speech file to generate PK. Highly Secure Data Encryption (HSDE) method will be implemented and tested for data quality levels to ensure that the HSDE destroys the data in the encryption phase, and recover the original data in the decryption phase. Some standard methods of data cryptography will be implemented; comparisons will be done to justify the enhancements provided by the proposed method.

• Journal of Convergence for Information Technology
• /
• v.9 no.1
• /
• pp.142-150
• /
• 2019

This study is a file management security system that encrypts and decrypts computer and cloud data by using Bluetooth based cryptographic module. It is a necessary solution in terms of abuse of personal information and protection of social and national information. We developed H/W and S/W for SFMS(: Safe File Management Security) related Bluetooth module in cloud environment and implemented firmware development, encryption key generation and issuance, client program for system mobile and key management system. In the terminal internal encryption and decryption, SFMS was developed to ensure high security that the hacking itself is not possible because key values exist separately for each file.