Masao KASAHARA


Security of a Class of Knapsack Public-Key Cryptosystems against Low-Density Attack
Takeshi NASAKO Yasuyuki MURAKAMI Masao KASAHARA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2008/10/01
Vol. E91-A  No. 10  pp. 2889-2892
Type of Manuscript:  Special Section LETTER (Special Section on Information Theory and Its Applications)
Category: Cryptography and Information Security
Keyword: 
knapsack PKCGaussian integerslow-density attack
 Summary | Full Text:PDF(117.1KB)

A Construction of Public-Key Cryptosystem Using Algebraic Coding on the Basis of Superimposition and Randomness
Masao KASAHARA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2006/01/01
Vol. E89-A  No. 1  pp. 47-54
Type of Manuscript:  Special Section PAPER (Special Section on Cryptography and Information Security)
Category: Public Key Cryptography
Keyword: 
algebraic codingrandom codingpublic-key cryptosystem
 Summary | Full Text:PDF(139.1KB)

A Construction of Public-Key Cryptosystem Based on Singular Simultaneous Equations
Masao KASAHARA Ryuichi SAKAI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2005/01/01
Vol. E88-A  No. 1  pp. 74-80
Type of Manuscript:  Special Section PAPER (Special Section on Cryptography and Information Security)
Category: Public Key Cryptography
Keyword: 
public-key cryptosystemsingular simultaneous equationsmultivariate polynomials
 Summary | Full Text:PDF(144.7KB)

A Construction of Public Key Cryptosystem for Realizing Ciphertext of Size 100 Bit and Digital Signature Scheme
Masao KASAHARA Ryuichi SAKAI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2004/01/01
Vol. E87-A  No. 1  pp. 102-109
Type of Manuscript:  Special Section PAPER (Special Section on Cryptography and Information Security)
Category: Asymmetric Cipher
Keyword: 
public key cryptosystemsimultaneous equationsmultivariate polynomialdigital signature
 Summary | Full Text:PDF(298.1KB)

A New Traitor Tracing
Shigeo MITSUNARI Ryuichi SAKAI Masao KASAHARA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2002/02/01
Vol. E85-A  No. 2  pp. 481-484
Type of Manuscript:  PAPER
Category: Information Security
Keyword: 
traitor tracingWeil pairingelliptic curve
 Summary | Full Text:PDF(180.6KB)

New Product-Sum Type Public-Key Cryptosystems with Selectable Encryption Key Based on Chinese Remainder Theorem
Kiyoko KATAYANAGI Yasuyuki MURAKAMI Masao KASAHARA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2002/02/01
Vol. E85-A  No. 2  pp. 472-480
Type of Manuscript:  PAPER
Category: Information Security
Keyword: 
public-key cryptosystemproduct-sum type cryptosystemlow-density attackChinese remainder theoremselectable encryption key
 Summary | Full Text:PDF(241.6KB)

A New Product-Sum Public-Key Cryptosystem Using Message Extension
Kiyoko KATAYANAGI Yasuyuki MURAKAMI Masao KASAHARA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2001/10/01
Vol. E84-A  No. 10  pp. 2482-2487
Type of Manuscript:  Special Section PAPER (Special Section on Information Theory and Its Applications)
Category: Information Security
Keyword: 
product-sum public-key cryptosystemChinese remainder theoremlow-density attackhigh densitymessage extension
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A New Product-Sum Type Public Key Cryptosystem Based on Reduced Bases
Daisuke SUZUKI Yasuyuki MURAKAMI Ryuichi SAKAI Masao KASAHARA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2001/01/01
Vol. E84-A  No. 1  pp. 326-330
Type of Manuscript:  Special Section LETTER (Special Section on Cryptography and Information Security)
Category: 
Keyword: 
low-density attackproduct-sum type public key cryptosystemsreduced base
 Summary | Full Text:PDF(284.3KB)

New Multiplicative Knapsack-Type Public Key Cryptosystems
Shinya KIUCHI Yasuyuki MURAKAMI Masao KASAHARA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2001/01/01
Vol. E84-A  No. 1  pp. 188-196
Type of Manuscript:  Special Section PAPER (Special Section on Cryptography and Information Security)
Category: 
Keyword: 
Morii-Kasahara cryptosystemSchalkwijk algorithmhigh ratefast encryptiondiscrete logarithm problem
 Summary | Full Text:PDF(354.2KB)

A New Probabilistic ID-Based Non-interactive Key Sharing Scheme
Yasuyuki MURAKAMI Ryuichi SAKAI Masao KASAHARA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2000/01/25
Vol. E83-A  No. 1  pp. 2-9
Type of Manuscript:  Special Section PAPER (Special Section on Cryptography and Information Security)
Category: 
Keyword: 
IDkey sharingnon-interactiveID-based non-interactive key sharing scheme (ID-NIKS)linear attackcollusion attack
 Summary | Full Text:PDF(429.7KB)

New Methods of Generating Primes Secure against Both P-1 and P+1 Methods
Yoshizo SATO Yasuyuki MURAKAMI Masao KASAHARA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1999/10/25
Vol. E82-A  No. 10  pp. 2161-2166
Type of Manuscript:  Special Section PAPER (Special Section on Information Theory and Its Applications)
Category: Security
Keyword: 
prime generationP-1 methodP+1 methodtrial division method
 Summary | Full Text:PDF(456.1KB)

An Upper Bound on Frame Error Rate for Generalized Concatenated Convolutional Codes
Tadashi WADAYAMA Koichiro WAKASUGI Masao KASAHARA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1999/06/25
Vol. E82-A  No. 6  pp. 1126-1130
Type of Manuscript:  LETTER
Category: Information Theory and Coding Theory
Keyword: 
generalized concatenated codeconvolutional codeframe error rateiterative decoding
 Summary | Full Text:PDF(173.3KB)

A Method for Evaluating Minimum Free Chernov Distance of Trellis-Codes for Discrete Memoryless Channel
Tadashi WADAYAMA Koichiro WAKASUGI Masao KASAHARA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1998/10/25
Vol. E81-A  No. 10  pp. 1972-1978
Type of Manuscript:  Special Section PAPER (Special Section on Information Theory and Its Applications)
Category: Coding Theory
Keyword: 
Chernov distancediscrete memoryless channeltrellis-codeminimum free distance
 Summary | Full Text:PDF(541.8KB)

An Upper Bound on Bit Error Rate for Concatenated Convolutional Code
Tadashi WADAYAMA Koichiro WAKASUGI Masao KASAHARA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1997/11/25
Vol. E80-A  No. 11  pp. 2123-2129
Type of Manuscript:  Special Section PAPER (Special Section on Information Theory and Its Applications)
Category: Coding Theory
Keyword: 
concatenated codeconvolutional codeinterleaveReed-Solomon codeburst correction
 Summary | Full Text:PDF(539KB)

A Class of Trellis-Codes for Partial Response Channel
Tadashi WADAYAMA Atsushi NAGAO Koichiro WAKASUGI Masao KASAHARA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1997/02/25
Vol. E80-A  No. 2  pp. 386-392
Type of Manuscript:  PAPER
Category: Information Theory and Coding Theory
Keyword: 
trellis codepartial-response channnel
 Summary | Full Text:PDF(481KB)

Matched Design Method for Concatenated Trellis-Coded Modulation
Tadashi WADAYAMA Koichiro WAKASUGI Masao KASAHARA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1996/11/25
Vol. E79-A  No. 11  pp. 1911-1917
Type of Manuscript:  PAPER
Category: Information Theory and Coding Theory
Keyword: 
trellis-coded modulationconcatenated codeweight distribution
 Summary | Full Text:PDF(573.7KB)

Some Optimal and Quasi-Optimal Binary Codes from Cyclic Codes over GF(2m)
Katsumi SAKAKIBARA Masao KASAHARA Yoshiharu YUBA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1996/10/25
Vol. E79-A  No. 10  pp. 1737-1738
Type of Manuscript:  LETTER
Category: Information Theory and Coding Theory
Keyword: 
optimal binary codesbinary image of cyclic codesGriesmer boundconcatenated structure
 Summary | Full Text:PDF(129.8KB)

Notes on the Average Binary Weight Enumerator of Generalized Algebraic-Geometric Codes
Takeshi UMEDA Katsumi SAKAKIBARA Masao KASAHARA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1996/09/25
Vol. E79-A  No. 9  pp. 1444-1446
Type of Manuscript:  Special Section LETTER (Special Section on Information Theory and Its Applications)
Category: Coding Theory
Keyword: 
Varshamov-Gilbert boundalgebraic-geometric codesbinary expansionaverage weight enumerator
 Summary | Full Text:PDF(167KB)

On the Unequal Error Protection Capability of a q-Ary Image of a Low-Rate qm-Ary Cyclic Code
Katsumi SAKAKIBARA Masao KASAHARA Yoshiharu YUBA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1996/09/25
Vol. E79-A  No. 9  pp. 1305-1312
Type of Manuscript:  Special Section PAPER (Special Section on Information Theory and Its Applications)
Category: Coding Theory
Keyword: 
unequal error protectionq-ary image of qm-ary cyclic codeconcatenated structure
 Summary | Full Text:PDF(638.1KB)

On Ambiguity in Coppersmith' Attacking Method a against NIKS-TAS Scheme
Shigeo TSUJII Kiyomichi ARAKI Masao KASAHARA Eiji OKAMOTO Ryuichi SAKAI Yasuo MAEDA Tomohiko YAGISAWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1996/01/25
Vol. E79-A  No. 1  pp. 66-75
Type of Manuscript:  Special Section PAPER (Special Section on Cryptography and Information Security)
Category: 
Keyword: 
modulo degeneracycryptanalysisID-based key sharingNIKS-TAS
 Summary | Full Text:PDF(762.2KB)

High Rate Binary Coset Code Used for Inner Code
Tadashi WADAYAMA Koichiro WAKASUGI Masao KASAHARA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1995/09/25
Vol. E78-A  No. 9  pp. 1071-1076
Type of Manuscript:  Special Section PAPER (Special Section on Information Theory and Its Applications)
Category: 
Keyword: 
concatenated codecoset codeconvolutional codeweight distribution
 Summary | Full Text:PDF(469.1KB)

Multi-Dimensional Block Shaping
Tadashi WADAYAMA Koichiro WAKASUGI Masao KASAHARA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1995/08/25
Vol. E78-A  No. 8  pp. 1034-1041
Type of Manuscript:  PAPER
Category: Information Theory and Coding Theory
Keyword: 
shapingcoded modulationMAW-code
 Summary | Full Text:PDF(603.9KB)

A New Class of Non-interactive ID-Based Key Sharing Schemes and Its Performances
Ryuichi SAKAI Masao KASAHARA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1995/01/25
Vol. E78-A  No. 1  pp. 51-58
Type of Manuscript:  Special Section PAPER (Special Section on Cryptography and Information Security)
Category: 
Keyword: 
key sharingID informationcommon keycryptosysteminformation security
 Summary | Full Text:PDF(557.2KB)

An 8-Dimensional Trellis-Coded 8-PSK with Non-zero Crossing Constraint
Tadashi WADAYAMA Koichiro WAKASUGI Masao KASAHARA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1994/08/25
Vol. E77-A  No. 8  pp. 1274-1280
Type of Manuscript:  Special Section PAPER (Special Section on Information Theory and Its Applications)
Category: 
Keyword: 
TCMπ/4-shift QPSKset partitioning,non-zero crossing
 Summary | Full Text:PDF(555.6KB)

New Key Generation Algorithm for RSA Cryptosystem
Ryuichi SAKAI Masakatu MORII Masao KASAHARA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1994/01/25
Vol. E77-A  No. 1  pp. 89-97
Type of Manuscript:  Special Section PAPER (Special Section on Cryptography and Information Security)
Category: 
Keyword: 
cryptographypublic-key cryptosystemRSAkey generation algorithmprimality test
 Summary | Full Text:PDF(693.6KB)

Performance of a Multicast Error Control Protocol Based on a Product Code Structure--Part : On Random Error Channels--
Katsumi SAKAKIBARA Masao KASAHARA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1992/12/25
Vol. E75-A  No. 12  pp. 1674-1683
Type of Manuscript:  Special Section PAPER (Special Section on Networks and Mobile Communications)
Category: 
Keyword: 
multicast error control protocolsproduct codesReddy-Robinson algorithmbinary symmetric channels
 Summary | Full Text:PDF(676.2KB)

Performance of a Multicast Error Control Protocol Based on a Product Code Structure--Part : On Burst Error Channels--
Katsumi SAKAKIBARA Masao KASAHARA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1992/12/25
Vol. E75-A  No. 12  pp. 1684-1695
Type of Manuscript:  Special Section PAPER (Special Section on Networks and Mobile Communications)
Category: 
Keyword: 
Multicast error control protocolsproduct codesburst error channelsGilbert modelinterleaving
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Communication Theory and the Applications--Theories, Coding and Applications--
Masao KASAHARA 
Publication:   IEICE TRANSACTIONS (1976-1990)
Publication Date: 1990/10/25
Vol. E73-E  No. 10  pp. 1570-1578
Type of Manuscript:  INVITED PAPER (Special Issue on Communication Theory and Its Applications)
Category: 
Keyword: 
 Summary | Full Text:PDF(730.6KB)

FOREWORD
Masao KASAHARA 
Publication:   IEICE TRANSACTIONS (1976-1990)
Publication Date: 1990/10/25
Vol. E73-E  No. 10  pp. 1567-1569
Type of Manuscript:  FOREWORD
Category: 
Keyword: 
 Summary | Full Text:PDF(202.3KB)

FOREWORD
Masao KASAHARA 
Publication:   IEICE TRANSACTIONS (1976-1990)
Publication Date: 1990/07/25
Vol. E73-E  No. 7  pp. 1023-1025
Type of Manuscript:  FOREWORD
Category: 
Keyword: 
 Summary | Full Text:PDF(199.9KB)

Coding and Decoding Schemes with Unequal Symbol Reliability
Shigeichi HIRASAWA Masao KASAHARA 
Publication:   IEICE TRANSACTIONS (1976-1990)
Publication Date: 1990/07/25
Vol. E73-E  No. 7  pp. 1176-1180
Type of Manuscript:  PAPER
Category: Information Theory and Coding Theory
Keyword: 
 Summary | Full Text:PDF(419.2KB)

Error Correcting Codes and Their Applications
Masao KASAHARA 
Publication:   IEICE TRANSACTIONS (1976-1990)
Publication Date: 1990/05/25
Vol. E73-E  No. 5  pp. 611-620
Type of Manuscript:  INVITED PAPER (Special Issue on Information Theory and Its Applications)
Category: 
Keyword: 
 Summary | Full Text:PDF(887.1KB)

Construction and Application of Separable Codes
Jun DU Masao KASAHARA 
Publication:   IEICE TRANSACTIONS (1976-1990)
Publication Date: 1989/06/25
Vol. E72-E  No. 6  pp. 710-718
Type of Manuscript:  PAPER
Category: Information Theory and Coding Theory
Keyword: 
 Summary | Full Text:PDF(678.4KB)

Improvements of the Information-Bit Error Rate of Trellis Code Modulation Systems
Jun DU Masao KASAHARA 
Publication:   IEICE TRANSACTIONS (1976-1990)
Publication Date: 1989/05/25
Vol. E72-E  No. 5  pp. 609-614
Type of Manuscript:  PAPER
Category: Foundations of Signal Theory and Communication Theory
Keyword: 
 Summary | Full Text:PDF(410.7KB)

Efficient Construction of Gate Circuit for Computing Multiplicative Inverses over GF (2m)
Masakatu MORII Masao KASAHARA 
Publication:   IEICE TRANSACTIONS (1976-1990)
Publication Date: 1989/01/25
Vol. E72-E  No. 1  pp. 37-42
Type of Manuscript:  PAPER
Category: Information Theory and Coding Theory
Keyword: 
 Summary | Full Text:PDF(455.7KB)

Probabilistic Coding for Write-Once Memory
Jun DU Makoto TATEBAYASHI Masao KASAHARA 
Publication:   IEICE TRANSACTIONS (1976-1990)
Publication Date: 1988/02/25
Vol. E71-E  No. 2  pp. 132-138
Type of Manuscript:  PAPER
Category: Information Theory and Coding Theory
Keyword: 
 Summary | Full Text:PDF(559.2KB)