• Journal of the Korea Institute of Information Security & Cryptology
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• v.18 no.2
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• pp.39-47
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• 2008

Among previous Side Channel Analysis (SCA) methods, Differential Power Analysis (DPA) based on the statistical characteristics of collected signals has been known as an efficient attack for uncovering secret key of cryptosystems. However, the attack performance of this method is affected very much by the temporal misalignment and noise of collected side channel signals. In this paper, we propose a new method to surmount the noise problem in DPA. The performance of the proposed method is then evaluated while analyzing the power consumption signals of Micro-controller chips during a DES operation. Its performance is then compared to that of the original DPA in the time and frequency domains. When we compare the experimental results with respect to the needed number of traces to uncover the secret key, our proposed method shows the performance enhancement 33% in the time domain and 50% in the frequency domain.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.2 no.1
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• pp.14-19
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• 1977

Our social needs many kinds of different circulation method, so the function of communication has been changed the whole situation through the process of many transitions. The form of our civilization is changing into the social which is full of information owing to the development of mass communication. The value of using the information is murk heightening by it's own high dependence. The using of information is being rapidly enlarged, at the same time the development of technique on the information management is caused by the development of communication technique. Thus geometrical operation of both of the above has changed the function of communication. Maybe we will have to present all the primary factors on the communication transition from the social side in order to develop communication method.

• Journal of Communications and Networks
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• v.16 no.6
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• pp.639-644
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• 2014

In low-density parity-check (LDPC) coded multiple-input multiple-output (MIMO) communication systems, probabilistic information are exchanged between an LDPC decoder and a MIMO detector. TheMIMO detector has to calculate probabilistic values for each bit which can be very complex. In [1], the authors presented a class of linear block codes named low-density MIMO codes (LDMC) which can reduce the complexity of MIMO detector. However, this code only supports the outer-iterations between the MIMO detector and decoder, but does not support the inner-iterations inside the LDPC decoder. In this paper, a new approach to construct LDMC codes is introduced. The new LDMC codes can be encoded efficiently at the transmitter side and support both of the inner-iterations and outer-iterations at the receiver side. Furthermore they can achieve the design rates and perform very well over MIMO channels.

• Proceedings of the Korean Society of Surveying, Geodesy, Photogrammetry, and Cartography Conference
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• 2010.04a
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• pp.295-299
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• 2010

The vertical photographs of the existing production role of aerial photogrammetry was sufficient for the purpose. The current variety of purposes, such as image maps are used. However, a 3-D stereoscopic mapping, three-dimensional modeling and obtaining the side information of objects are difficult with limitations. In this study, aerial polyhedral oblique imagery are used for obtaining the a vertical and the side information of buildings at the same time to get used to the urban information. The results of this study, various urban information was available, the existing vertical photos can overcome the limitations of the techniques.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.21 no.5
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• pp.15-25
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• 2011

A differential fault analysis(DFA) is one of the most important side channel attacks on block ciphers. Most block ciphers, such as DES, AES, ARIA, SEED and so on., have been analysed by this attack. In 2008, Wei et al. proposed the first DFA on ARIA-128. Their attack can recover the 128-bit secrey key by about 45 faulty ciphertexts. In this paper, we propose an improved DFA on ARIA-128. We can recover the 12S-bit secret key by only 4 faulty ciphertexts with the computational complexity of O($2^{32}$).

• Journal of the Korean Institute of Telematics and Electronics
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• v.25 no.4
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• pp.453-459
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• 1988

A new interpolation function, named modified raised-cosine interpolation, is proposed. This function is derived from the linear combination of weighted triangular and raised-cosine functions to reduce the effect of side lobes which incur the interpolation error. Interpolation error reduces significantly for higher-order convolutional interpolation functions of linear operators, but at the expense of resolution error due to the attenuation of main lobe. However, the proposed interpolation function enables us to reduce the side lobes as well as to preserve the main lobe. To prove practicality, this function is applied in image reconstruction and enlargement.

• Proceedings of the IEEK Conference
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• 2000.11b
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• pp.253-256
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• 2000

We report the experimental results for the coupling properties of the an side-polished single-mode fiber covered with metal-clad planar waveguide. The experimental results show that the large birefringence of a metal-clad planar waveguide facilitates the effective separation of TE and TM polarization in the spectral domain. Additionally the resonant wavelengths of the device are tuned based in the thermo-optic effect of polymer planar waveguide.

• Proceedings of the IEEK Conference
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• 2003.07b
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• pp.783-786
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• 2003

A simple fabrication method of self-aligned ridge waveguides with dielectric side buffers is demonstrated on +Z- cut LiNbO$_3$. The ridge waveguide is fabricated by a combination of the annealed proton exchange process and the proton-exchanged wet etching technique. The self-aligned process is achieved by wet etching of aluminum.

• Journal of the Korean Institute of Telematics and Electronics B
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• v.33B no.12
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• pp.106-112
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• 1996

A ZVT (zero voltage transition) converter for SRM (switched reluctance motor) drives is proposed in this study. By adding a ZVT-chopping switch in the front-end, all switches in the machine side converter can be operated without any chopping to regulate phase current. This allows the use of low-cost and slow-switching devices for the machine side converter. The ZVT circuitry allows high frequency operation of th echopping switch, which enhnaces the system dynamcis and phase-current ripples. High efficiency of th eintegrated converter is obtained due to low switching losses.

• Journal of Electrical Engineering and Technology
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• v.11 no.5
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• pp.1093-1099
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• 2016