Yoshitaka MORIKAWA


An Improvement of Twisted Ate Pairing Efficient for Multi-Pairing and Thread Computing
Yumi SAKEMI Yasuyuki NOGAMI Shoichi TAKEUCHI Yoshitaka MORIKAWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2011/06/01
Vol. E94-A  No. 6  pp. 1356-1367
Type of Manuscript:  Special Section PAPER (Special Section on Discrete Mathematics and Its Applications)
Category: 
Keyword: 
twisted Ate pairingMiller's algorithmFrobenius mapmulti-pairingthread computing
 Summary | Full Text:PDF(414.9KB)

Mixed Bases for Efficient Inversion in F((22)2)2 and Conversion Matrices of SubBytes of AES
Yasuyuki NOGAMI Kenta NEKADO Tetsumi TOYOTA Naoto HONGO Yoshitaka MORIKAWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2011/06/01
Vol. E94-A  No. 6  pp. 1318-1327
Type of Manuscript:  Special Section PAPER (Special Section on Discrete Mathematics and Its Applications)
Category: 
Keyword: 
AESinversiontoweringconversion matrixbases
 Summary | Full Text:PDF(771KB)

Cyclic Vector Multiplication Algorithm and Existence Probability of Gauss Period Normal Basis
Kenta NEKADO Yasuyuki NOGAMI Hidehiro KATO Yoshitaka MORIKAWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2011/01/01
Vol. E94-A  No. 1  pp. 172-179
Type of Manuscript:  Special Section PAPER (Special Section on Cryptography and Information Security)
Category: Mathematics
Keyword: 
extension fieldGauss period normal basisall one polynomial fieldcyclic vector multiplication algorithm
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Image Restoration Using a Universal GMM Learning and Adaptive Wiener Filter
Nobumoto YAMANE Motohiro TABUCHI Yoshitaka MORIKAWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2009/10/01
Vol. E92-A  No. 10  pp. 2560-2571
Type of Manuscript:  PAPER
Category: Digital Signal Processing
Keyword: 
Wiener filterGaussian mixture distribution modeloptimal restoration filteradaptive filterstatistical learning
 Summary | Full Text:PDF(1.2MB)

Integer Variable χ-Based Cross Twisted Ate Pairing and Its Optimization for Barreto-Naehrig Curve
Yasuyuki NOGAMI Yumi SAKEMI Hidehiro KATO Masataka AKANE Yoshitaka MORIKAWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2009/08/01
Vol. E92-A  No. 8  pp. 1859-1867
Type of Manuscript:  Special Section PAPER (Special Section on Discrete Mathematics and Its Applications)
Category: Theory
Keyword: 
Ate pairingMiller's algorithm
 Summary | Full Text:PDF(280.6KB)

Finding a Basis Conversion Matrix via Prime Gauss Period Normal Basis
Yasuyuki NOGAMI Ryo NAMBA Yoshitaka MORIKAWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2009/06/01
Vol. E92-A  No. 6  pp. 1500-1507
Type of Manuscript:  PAPER
Category: Information Theory
Keyword: 
public key cryptographyextension fieldGauss period normal basisbasis conversion
 Summary | Full Text:PDF(299.9KB)

Fast Ate Pairing Computation of Embedding Degree 12 Using Subfield-Twisted Elliptic Curve
Masataka AKANE Yasuyuki NOGAMI Yoshitaka MORIKAWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2009/02/01
Vol. E92-A  No. 2  pp. 508-516
Type of Manuscript:  PAPER
Category: Cryptography and Information Security
Keyword: 
Ate pairingtwistsubfield arithmetic operationfast computing
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A Multiplication Algorithm in Fpm Such That p>m with a Special Class of Gauss Period Normal Bases
Hidehiro KATO Yasuyuki NOGAMI Tomoki YOSHIDA Yoshitaka MORIKAWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2009/01/01
Vol. E92-A  No. 1  pp. 173-181
Type of Manuscript:  Special Section PAPER (Special Section on Cryptography and Information Security)
Category: Mathematics
Keyword: 
extension fieldpublic-key cryptographyfast implementationGauss period normal basesoptimal normal basis
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Scalar Multiplication Using Frobenius Expansion over Twisted Elliptic Curve for Ate Pairing Based Cryptography
Yasuyuki NOGAMI Yumi SAKEMI Takumi OKIMOTO Kenta NEKADO Masataka AKANE Yoshitaka MORIKAWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2009/01/01
Vol. E92-A  No. 1  pp. 182-189
Type of Manuscript:  Special Section PAPER (Special Section on Cryptography and Information Security)
Category: Mathematics
Keyword: 
Ate pairingBN curvescalar multiplicationFrobenius mappingtwisted subfield computation
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Minimum Mean Absolute Error Predictors for Lossless Image Coding
Yoshihiko HASHIDUME Yoshitaka MORIKAWA Shuichi MAKI 
Publication:   IEICE TRANSACTIONS on Information and Systems
Publication Date: 2008/06/01
Vol. E91-D  No. 6  pp. 1783-1792
Type of Manuscript:  PAPER
Category: Image Processing and Video Processing
Keyword: 
lossless image codingminimum mean absolute errorl1-problemlinear programmingmmae predictoradaptive predictioncontext modelingerror modeling
 Summary | Full Text:PDF(902.9KB)

A Necessary Condition for Gauss Period Normal Bases to Be the Same Normal Basis
Yasuyuki NOGAMI Ryo NAMBA Yoshitaka MORIKAWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2008/04/01
Vol. E91-A  No. 4  pp. 1229-1232
Type of Manuscript:  LETTER
Category: Cryptography and Information Security
Keyword: 
Gauss period normal basistrace
 Summary | Full Text:PDF(77.5KB)

An Efficient Square Root Computation in Finite Fields GF(p2d)
Feng WANG Yasuyuki NOGAMI Yoshitaka MORIKAWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2005/10/01
Vol. E88-A  No. 10  pp. 2792-2799
Type of Manuscript:  Special Section PAPER (Special Section on Information Theory and Its Applications)
Category: Cryptography and Information Security
Keyword: 
square rootfinite fieldsquadratic residue
 Summary | Full Text:PDF(211.2KB)

Fast Implementation of Extension Fields with TypeII ONB and Cyclic Vector Multiplication Algorithm
Yasuyuki NOGAMI Shigeru SHINONAGA Yoshitaka MORIKAWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2005/05/01
Vol. E88-A  No. 5  pp. 1200-1208
Type of Manuscript:  Special Section PAPER (Special Section on Discrete Mathematics and Its Applications)
Category: 
Keyword: 
extension fieldpublic-key cryptosystemfast implementationoptimal extension fieldoptimal normal basis
 Summary | Full Text:PDF(181.4KB)

Finite Extension Field with Modulus of All-One Polynomial and Representation of Its Elements for Fast Arithmetic Operations
Yasuyuki NOGAMI Akinori SAITO Yoshitaka MORIKAWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2003/09/01
Vol. E86-A  No. 9  pp. 2376-2387
Type of Manuscript:  PAPER
Category: Information Theory
Keyword: 
optimal extension fieldFrobenius mappingnormal basisinversion
 Summary | Full Text:PDF(328.7KB)

Coding Gain in Non-Paraunitary Subband Coding Systems
S. A. Asghar BEHESHTI SHIRAZI Yoshitaka MORIKAWA Hiroshi HAMADA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1996/02/25
Vol. E79-A  No. 2  pp. 233-241
Type of Manuscript:  PAPER
Category: Information Theory and Coding Theory
Keyword: 
subband codingnon-paraunitarycoding gainbit allocation quantizer model
 Summary | Full Text:PDF(640.2KB)

Improvement of Performance in DCT and SSKF Image Coding Systems for Negatively-Correlated Signal Input by Signal Modulation
S. A. Asghar BEHESHTI SHIRAZI Yoshitaka MORIKAWA Hiroshi HAMADA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 1995/11/25
Vol. E78-B  No. 11  pp. 1529-1542
Type of Manuscript:  PAPER
Category: Source Encoding
Keyword: 
image codingDCTSSKFnegative correlationsignal modulation
 Summary | Full Text:PDF(1.2MB)