• Proceedings of the IEEK Conference
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• 2002.06b
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• pp.281-284
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• 2002

Rijndael algorithm is known to a new private key block cipher which is substitute for DES. Rijndael algorithm is adequate to both hardware and software implementation, so hardware implementation of Rijndael algorithm is applied to high speed data encryption and decryption. This paper describes three implementation methods of Rijndael S-box, which is important factor in performance of Rijndael coprocessor. It shows synthesis results of each S-box implementation in Xilinx FPGA. Tllc lilree S-box implementation methods are implementation using lookup table only, implementation using both lookup table and combinational logic, and implementation using combinational logic only.

• The Journal of the Korea Contents Association
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• v.2 no.3
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• pp.80-86
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• 2002

In this paper, we propose the new optical security technique using two phase holograms based on interferometer. The encoded random phase image does not have any information on the original image. Without Hewing the key mask, one cannot decode the encrypted image and regenerate the original image. And the use of two phase only images in the proposed security system leads to maximum optical efficiency (100% in theory). Also they cannot be detected by an intensity detector such as a CCD camera. Computer simulations and optical experiments show performance of the proposed methods.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.7 no.9
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• pp.2326-2337
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• 2013

Many applications can be parallelized by using multicore platforms. We propose a load-balancing technique for parallelizing a whole application, whose first module (H.264) has data independency and whose second module (AES) has data dependency. Instead of distributing the first module symmetrically over the multi-core platform, we distribute the data-independent workload asymmetrically in order to start the data-dependent workload as early as possible. Based on the experimental results with a compression/encryption application, we confirm that the asymmetric load balancing can provide better performance than the typical symmetric load balancing.

• Korean Management Science Review
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• v.10 no.1
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• pp.59-80
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• 1993

Electronic data interchange (EDI) is a new technology of information communication which can make offices paperless. This study develop an EDI system to communicate informations among companies using computer systems. The system consists of five modules-document I/O, translation, system management, communication, and additional modules. The database of EDI documentation standards has been constructed by the table-driven method. The communication module provides three communication modes-RS232C, MODEM, and message handling system (MHS). The system performance has been improved by the method of data compression and data encryption which prevent the communication delay and illegal users. This EDI system can be used as a front-end, back-end, or stand-alone mode.

• Proceedings of the Korea Information Processing Society Conference
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• 2017.11a
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• pp.182-185
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• 2017

넌어드레스(Non-Addressable) 장비는 IP 주소를 포함한 기타 어느 계정을 갖지 않는 통신 보안 장비로서, 해킹을 포함한 허가되지 않은 공격들로부터 원천적으로 단말을 보안할 수 있다. 본 논문에서는 넌어드레스 장비에서 AES 방식으로 데이터를 암/복호화 시 성능을 향상시키기 위한 방법을 제시한다. AES-128, 192, 256에서의 암/복호화 시간, CPU 사용량, 메모리 사용량, 실제 데이터의 전송속도를 비교하여 최선의 설정 방법을 도출한다.

• Proceedings of the IEEK Conference
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• 2002.07c
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• pp.1547-1550
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• 2002

Reconfigurable computing is a new computing paradigm which has more potential in terms of performance and flexibility. Reconfigurable computing systems are opening a new era in digital signal processing such as multimedia, communication and consumer electronics because they can filter data rapidly and excel at pattern recognition, image process- ing and encryption. Although many reconfigurable computing systems use a conventional programmable device, they carry several serious problems to be solved. This paper proposes a logic block architecture of programmable device suit-able for the reconfigurable computing. Compared to conventional logic blocks, our logic block can improve implementation density, efficiency and speed.

• Journal of Communications and Networks
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• v.16 no.4
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• pp.363-370
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• 2014

Despite several years of intense research, the security and cryptography in wireless sensor networks still have a number of ongoing problems. This paper describes how identification (ID)-based node authentication can be used to solve the key agreement problem in a three-layer interaction. The scheme uses a novel security mechanism that considers the characteristics, architecture, and vulnerability of the sensors, and provides an ID-based node authentication that does not require expensive certificates. The scheme describes the routing process using a simple ID suitable for low power and ID exposure, and proposes an ID-based node authentication. This method achieves low-cost communications with an efficient protocol. Results from this study demonstrates that it improves routing performance under different node densities, and reduces the computational cost of key encryption and decryption.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.41 no.1
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• pp.101-103
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• 2016

We propose a HTTP cookie-based identification of the public keys of Web sites for the case of failure to validate certificates. The proposed scheme effectively protects users from the phishing attacks of inducing them to access bogus sites. It incurs little performance overhead on the browser and the server of Web sites. It requires to implement the input processing of user credentials and the encryption and verification of cookie values, though.

• Journal of Information Processing Systems
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• v.16 no.1
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• pp.96-112
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• 2020

Solving the disclosure problem of sensitive information with the k-nearest neighbor query, location dummy technique, or interfering data in location-based services (LBSs) is a new research topic. Although they reduced security threats, previous studies will be ineffective in the case of sparse users or K-successive privacy, and additional calculations will deteriorate the performance of LBS application systems. Therefore, a model is proposed herein, which is based on geohash-encoding technology instead of latitude and longitude, memcached server cluster, encryption and decryption, and authentication. Simulation results based on PHP and MySQL show that the model offers approximately 10× speedup over the conventional approach. Two problems are solved using the model: sensitive information in LBS application is not disclosed, and the relationship between an individual and a track is not leaked.

• Current Optics and Photonics
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• v.3 no.5
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• pp.390-400
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• 2019

Encrypted images obtained through double random phase-encoding (DRPE) occupy considerable storage space. We propose efficient compression schemes to reduce the size of the encrypted data. In the proposed schemes, two state-of-art compression methods of JPEG and JP2K are applied to the quantized encrypted phase images obtained by combining the DRPE algorithm with the virtual photon counting imaging technique. We compute the nonlinear cross-correlation between the registered reference images and the compressed input images to verify the performance of the compression of double random phase-encoded images. We show quantitatively through experiments that considerable compression of the encrypted image data can be achieved while security and authentication factors are completely preserved.