• KSII Transactions on Internet and Information Systems (TIIS)
• /
• v.8 no.11
• /
• pp.4203-4225
• /
• 2014

Fuzzy identity-based cryptography introduces the threshold structure into identity-based cryptography, changes the receiver of a ciphertext from exact one to dynamic many, makes a cryptographic scheme more efficient and flexible. In this paper, we propose the first fuzzy identity-based signcryption scheme in lattice-based cryptography. Firstly, we give a fuzzy identity-based signcryption scheme that is indistinguishable against chosen plaintext attack under selective identity model. Then we apply Fujisaki-Okamoto method to obtain a fuzzy identity-based signcryption scheme that is indistinguishable against adaptive chosen ciphertext attack under selective identity model. Thirdly, we prove our scheme is existentially unforgeable against chosen message attack under selective identity model. As far as we know, our scheme is the first fuzzy identity-based signcryption scheme that is secure even in the quantum environment.

• Journal of the Korean Home Economics Association
• /
• v.42 no.1
• /
• pp.207-227
• /
• 2004

The purpose of this study was to investigate conceptual representations of the self in Korean culture by analyzing normative conception of the self present in Sohak. The method of this study was the historical method and the material for analysis is 'Reverencing for the Self of Sohak, which was the textbook for childhood education and contained normative tasks that the society of the Chosen Dynasty period held for what people should do in their lives. According to the analysis, the Chosen Dynasty had interdependent conception of the self, which had strong emphasis on connected relationships, especially between self and parents, and regarded respect, rightness, and politeness as important attributes of the self, and expected reciprocal exchange of mutual support in social roles. Also, there were many instrumental and terminal goals in normative expectations of the self, which were toward harmonious interdependent relationships. Finally, the attributes of the self that were thought of as positive characteristics served collective interests rather than individualistic ones. In addition, the society of the Chosen dynasty regarded socially disengaged emotion such as pride, anger, and pleasure as negative ones.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.39B no.5
• /
• pp.317-322
• /
• 2014

Data security and integrity is a critical issue in data transmission over wired/wireless links. A large amount of data is encrypted before transmission, by block cipher using mode of operation. RBF mode is a block cipher mode of operation which uses random characteristics. In this paper, we analyze the safety against known plaintext attack and chosen plaintext attack of RBF mode compared to the traditional modes. According to the analysis, RBF mode is known to be secure while the traditional modes are not secure against them.

• The Journal of Korean Medical History
• /
• v.25 no.2
• /
• pp.29-47
• /
• 2012

The Chimgeumdongin(鍼金銅人) is a Acupuncture Bronze Man that casted by Choe Cheonyak(崔天若) the meister and directed by O Jicheol(吳志哲) the royal chief acupuncture doctor of Chosen dynasty(朝鮮) in 1741. Choe Cheonyak casted the Chimgeumdongin at least 12 parts. After welding the parts, engrave the names of acupuncture point on it. It is suggested that there maybe one or more Wooden Acupuncture Man that remedy mistakes for a longtime before 1741. This became a prototype of Chimgeumdongin. The contents of Chimgeumdongin's acupuncture points are equal to which was recited by royal acupuncture doctors for hundreds years. Chimgeumdongin rigorously apply the bone proportional unit measurement of . and the range of error was between 0.01cm~1.67cm. Specially, they made it's head 1.34 times bigger, by long experience. Accoding to , the Chimgeumdongin was used for training inexperienced royal acupuncture doctors. As shown above, the Chimgeumdongin could be represents standard acupuncture technology of Chosen dynasty.

• Bulletin of the Korean Chemical Society
• /
• v.7 no.2
• /
• pp.89-96
• /
• 1986

The NMR chemical shift arising from 4d electron angular momentum and 4d electron spin dipolar-nuclear spin angular momentum interaction for a $4d^1$ system in a strong crystal field of octahedral symmetry, when the threefold axis is chosen as the quantization axis, has been investigated. A general expression using a nonmultipole expansion method is derived for the NMR chemical shift. From this expression all the multipolar terms are determined. We find that the nonmultipolar results for the NMR chemical shift ${\Delta}B$, is exactly in agreement with the multipolar results when $R {\ge} 0.20$ nm. It is also found that the 1/$R^7$ term contributes to the NMR chemical shift almost the same as the 1/$R^5$ in magnitude. The temperature dependence analysis of ${\Delta}B$/B(ppm) at various values of R shows that the 1/$T^2$ term has the dominant contribution to the NMR chemical shift but the contributions of other two terms are certainly significant for a $4d^1$ system in a strong crystal field of octahedral symmetry when the threefold axis is chosen to be the axis of quantization.

• Journal of the Korea Institute of Information Security & Cryptology
• /
• v.14 no.1
• /
• pp.47-57
• /
• 2004

The Goldreich-Goldwasser-Halevi(GGH)'s signature scheme from Crypto '97 is cryptanalyzed, which is based on the well-blown lattice problem. We mount a chosen message attack on the signature scheme, and show the signature scheme is vulnerable to the attack. We collects n lattice points that are linearly independent each other, and constructs a new basis that generates a sub-lattice of the original lattice. The sub-lattice is shown to be sufficient to generate a valid signature. Empirical results are presented to show the effectiveness of the attack Finally, we show that the cube-like parameter used for the private-key generation is harmful to the security of the scheme.

• Journal of the Korea Institute of Information Security & Cryptology
• /
• v.14 no.3
• /
• pp.118-124
• /
• 2004

KASUMI is a 64-bit iterated block cipher with a 128-bit key size and 8 rounds Feistel structure. In this paper, we describe saturation attacks on the five round KASUMI, which requires 10 $\times$$2^{32}$ chosen plaintexts and $2^{115}$ computational complexity We also improve this attack using meet-in-the-middle technique. This attack requires 7$\times$$2^{32}$ chosen plaintexts and $2^{90}$ computational complexity. Futhermore, we attack KASUMI by controlling the value of the fixed part of the key. This attack needs 3$\times$$2^{32}$ chosen plaintexts and $2^{57}$ computational complexity.

• JOURNAL OF ELECTRICAL WORLD
• /
• no.4 s.160
• /
• pp.2-7
• /
• 1990

• English Language & Literature Teaching
• /
• v.17 no.2
• /
• pp.39-58
• /
• 2011

This study highlights some very important future directions for the revision of language forms in the 2007 Korean English Curriculum, expected to be made public in the summer of 2011. A critical review of the 2007 National English Curriculum shows that language forms exemplified in that curriculum are not well-chosen or well-sequenced from the viewpoint of grammar selection and gradation, and that no mention of structural labels or grammatical terminologies makes it hard for teachers to recognize their formal properties. To fulfill the original purpose that languages should be listed in the curriculum so that functional-notional syllabuses can be complemented by form-focused instruction, the study presents partial inventories of grammatical items with well-chosen and well-sequenced examples. Minimal descriptions are given to these inventories that are based on general notions or well-known grammatical notions. Occasional suggestions are also made for which language forms should be taught in which schools.

• ETRI Journal
• /
• v.32 no.2
• /
• pp.302-311
• /
• 2010

In this study, we analyzed consumers' choices of various broadcasting and telecommunication convergence services and time consumption for chosen services by using survey data. A multivariate probit model was used to model consumers' choices of various broadcasting and telecommunication convergence services, and an ordered probit model was used to model consumers' time consumption for chosen services. Factors affecting consumers' choices and time-consumption behavior were identified, and simulation results of market competition and substitution were obtained. Based on these results, it was found that for the time being, consumers are highly locked into existing broadcasting services and are likely to become more price-sensitive to the new broadcasting and telecommunication convergence services. Also, the ways in which individual characteristics affect choices and time consumption were found to be very diverse service by service.