Toru NAKANISHI


Revocable Group Signatures with Compact Revocation List Using Vector Commitments
Shahidatul SADIAH Toru NAKANISHI 
Publication:   
Publication Date: 2017/08/01
Vol. E100-A  No. 8  pp. 1672-1682
Type of Manuscript:  PAPER
Category: Cryptography and Information Security
Keyword: 
privacygroup signaturesrevocationvector commitments
 Summary | Full Text:PDF(734KB)

Revocable Group Signatures with Compact Revocation List Using Accumulators
Toru NAKANISHI Nobuo FUNABIKI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2015/01/01
Vol. E98-A  No. 1  pp. 117-131
Type of Manuscript:  Special Section PAPER (Special Section on Cryptography and Information Security)
Category: Public Key Based Cryptography
Keyword: 
anonymitygroup signaturesrevocationsaccumulators
 Summary | Full Text:PDF(635KB)

An Anonymous Reputation System with Reputation Secrecy for Manager
Toru NAKANISHI Nobuo FUNABIKI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2014/12/01
Vol. E97-A  No. 12  pp. 2325-2335
Type of Manuscript:  Special Section PAPER (Special Section on Information Theory and Its Applications)
Category: Cryptography and Information Security
Keyword: 
reputation systemanonymityanonymous credentialspairings
 Summary | Full Text:PDF(568.9KB)

An Access-Point Aggregation Approach for Energy-Saving Wireless Local Area Networks
Md. Ezharul ISLAM Nobuo FUNABIKI Toru NAKANISHI Kan WATANABE 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2013/12/01
Vol. E96-B  No. 12  pp. 2986-2997
Type of Manuscript:  Special Section PAPER (Special Section on Network and System Technologies for Sustainable Society)
Category: 
Keyword: 
wireless local area networkaccess-point aggregationNP-completealgorithmenergy-savingIEEE 802.11n
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Efficient Proofs for CNF Formulas on Attributes in Pairing-Based Anonymous Credential System
Nasima BEGUM Toru NAKANISHI Nobuo FUNABIKI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2013/12/01
Vol. E96-A  No. 12  pp. 2422-2433
Type of Manuscript:  Special Section PAPER (Special Section on Information Theory and Its Applications)
Category: Information Security
Keyword: 
anonymityanonymous credentialsattributesCNF formulas
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A Fixed Backoff-Time Switching Method for CSMA/CA Protocol in Wireless Mesh Networks
Sritrusta SUKARIDHOTO Nobuo FUNABIKI Toru NAKANISHI Kan WATANABE Shigeto TAJIMA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2013/04/01
Vol. E96-B  No. 4  pp. 1019-1029
Type of Manuscript:  PAPER
Category: Wireless Communication Technologies
Keyword: 
wireless mesh networkCSMA/CA protocolfixed backoff-time switching (FBS)real-time applicationQualNet
 Summary | Full Text:PDF(2.3MB)

Forward-Secure Group Signatures from Pairings
Toru NAKANISHI Yuta HIRA Nobuo FUNABIKI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2010/11/01
Vol. E93-A  No. 11  pp. 2007-2016
Type of Manuscript:  Special Section PAPER (Special Section on Information Theory and Its Applications)
Category: Cryptography and Information Security
Keyword: 
anonymitygroup signaturesforward-securitypairings
 Summary | Full Text:PDF(441.3KB)

Extensions of the Access Point Allocation Algorithm for Wireless Mesh Networks
Walaa HASSAN Nobuo FUNABIKI Toru NAKANISHI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2010/06/01
Vol. E93-B  No. 6  pp. 1555-1565
Type of Manuscript:  PAPER
Category: Terrestrial Radio Communications
Keyword: 
wireless mesh networkindoor environmentaccess point allocationmultiple gatewaysdependabilityalgorithm
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Revocable Group Signature Schemes with Constant Costs for Signing and Verifying
Toru NAKANISHI Hiroki FUJII Yuta HIRA Nobuo FUNABIKI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2010/01/01
Vol. E93-A  No. 1  pp. 50-62
Type of Manuscript:  Special Section PAPER (Special Section on Cryptography and Information Security)
Category: Digital Signature
Keyword: 
anonymitygroup signaturesrevocationspairings
 Summary | Full Text:PDF(286KB)

An Access Point Allocation Algorithm for Indoor Environments in Wireless Mesh Networks
Tamer FARAG Nobuo FUNABIKI Toru NAKANISHI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2009/03/01
Vol. E92-B  No. 3  pp. 784-793
Type of Manuscript:  Special Section PAPER (Special Section on Ad Hoc and Mesh Networking for Next Generation Access Systems)
Category: 
Keyword: 
access point allocationwireless mesh networkalgorithmindoor environmentNP-complete
 Summary | Full Text:PDF(411.2KB)

A Short Verifier-Local Revocation Group Signature Scheme with Backward Unlinkability
Toru NAKANISHI Nobuo FUNABIKI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2007/09/01
Vol. E90-A  No. 9  pp. 1793-1802
Type of Manuscript:  Special Section PAPER (Special Section on Information Theory and Its Applications)
Category: 
Keyword: 
group signaturerevocationbackward unlinkabilitybilinear mapsDLDH assumption
 Summary | Full Text:PDF(213.7KB)

Verifier-Local Revocation Group Signature Schemes with Backward Unlinkability from Bilinear Maps
Toru NAKANISHI Nobuo FUNABIKI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2007/01/01
Vol. E90-A  No. 1  pp. 65-74
Type of Manuscript:  Special Section PAPER (Special Section on Cryptography and Information Security)
Category: Signatures
Keyword: 
group signaturerevocationunlinkabilitybilinear maps
 Summary | Full Text:PDF(220.6KB)

Group Signature Schemes with Membership Revocation for Large Groups
Toru NAKANISHI Nobuo FUNABIKI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2006/05/01
Vol. E89-A  No. 5  pp. 1275-1283
Type of Manuscript:  Special Section PAPER (Special Section on Discrete Mathematics and Its Applications)
Category: 
Keyword: 
group signature schemesmembership revocationsignatures of knowledgestrong RSA assumption
 Summary | Full Text:PDF(208KB)

An Efficient On-Line Electronic Cash with Unlinkable Exact Payments
Toru NAKANISHI Yuji SUGIYAMA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2005/10/01
Vol. E88-A  No. 10  pp. 2769-2777
Type of Manuscript:  Special Section PAPER (Special Section on Information Theory and Its Applications)
Category: Cryptography and Information Security
Keyword: 
on-line e-cashunlinkabilityexact paymentszero-knowledge proofs of knowledgepaillier cryptosystem
 Summary | Full Text:PDF(195.7KB)

A Group Signature Scheme with Efficient Membership Revocation for Middle-Scale Groups
Toru NAKANISHI Yuji SUGIYAMA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2005/05/01
Vol. E88-A  No. 5  pp. 1224-1233
Type of Manuscript:  Special Section PAPER (Special Section on Discrete Mathematics and Its Applications)
Category: 
Keyword: 
group signaturemembership revocationstrong RSA assumption
 Summary | Full Text:PDF(199KB)

An Optical-Drop Wavelength Assignment Algorithm for Efficient Wavelength Reuse under Heterogeneous Traffic in WDM Ring Networks
Nobuo FUNABIKI Jun KAWASHIMA Toru NAKANISHI Kiyohiko OKAYAMA Teruo HIGASHINO 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2005/05/01
Vol. E88-A  No. 5  pp. 1234-1240
Type of Manuscript:  Special Section PAPER (Special Section on Discrete Mathematics and Its Applications)
Category: 
Keyword: 
WDMheuristic algorithmoptical-dropwavelength assignmentring networkNP-complete
 Summary | Full Text:PDF(252.7KB)

Sealed-Bid Auctions with Efficient Bids Using Secure Bit-Slicing Conversion
Toru NAKANISHI Yuji SUGIYAMA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2004/10/01
Vol. E87-A  No. 10  pp. 2533-2542
Type of Manuscript:  Special Section PAPER (Special Section on Information Theory and Its Applications)
Category: Cryptography and Information Security
Keyword: 
sealed-bid auctionmultiparty computation (MPC)mix-and-matchadditive homomorphic cryptosystems
 Summary | Full Text:PDF(210.8KB)

A Minimum Dead Space Algorithm for Generalized Isochronous Channel Reuse Problems in DQDB Networks
Nobuo FUNABIKI Jun KAWASHIMA Kiyohiko OKAYAMA Toru NAKANISHI Teruo HIGASHINO 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2004/09/01
Vol. E87-B  No. 9  pp. 2692-2698
Type of Manuscript:  PAPER
Category: Network
Keyword: 
ICRPheuristic algorithmminimum dead spaceNP-completeIEEE 802.6DQDB
 Summary | Full Text:PDF(271KB)

P2PMM_router: A Two-Stage Heuristic Algorithm to Peer-to-Peer Multicast Routing Problems in Multihome Networks
Nobuo FUNABIKI Jun KAWASHIMA Shoji YOSHIDA Kiyohiko OKAYAMA Toru NAKANISHI Teruo HIGASHINO 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2004/05/01
Vol. E87-A  No. 5  pp. 1070-1076
Type of Manuscript:  Special Section PAPER (Special Section on Discrete Mathematics and Its Applications)
Category: 
Keyword: 
peer-to-peer multicastreal-time communicationmultihome networkheuristic algorithmNP-complete
 Summary | Full Text:PDF(260.9KB)

An Efficient Anonymous Survey for Attribute Statistics Using a Group Signature Scheme with Attribute Tracing
Toru NAKANISHI Yuji SUGIYAMA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2003/10/01
Vol. E86-A  No. 10  pp. 2560-2568
Type of Manuscript:  Special Section PAPER (Special Section on Information Theory and Its Applications)
Category: Information Security
Keyword: 
anonymous survey for attribute statisticsgroup signature schemeattribute tracingsignature of knowledgestrong RSA assumption
 Summary | Full Text:PDF(265.1KB)

An Efficiency Improvement on an Unlinkable Divisible Electronic Cash System
Toru NAKANISHI Yuji SUGIYAMA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2002/10/01
Vol. E85-A  No. 10  pp. 2326-2335
Type of Manuscript:  PAPER
Category: Information Security
Keyword: 
electronic cash systemdivisibilityunlinkabilitygroup signature schemesignatures based on zero-knowledge proofs of knowledge
 Summary | Full Text:PDF(305.5KB)

A Quasi-Solution State Evolution Algorithm for Channel Assignment Problems in Cellular Networks
Nobuo FUNABIKI Toru NAKANISHI Tokumi YOKOHIRA Shigeto TAJIMA Teruo HIGASHINO 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2002/05/01
Vol. E85-A  No. 5  pp. 977-987
Type of Manuscript:  Special Section PAPER (Special Section on Discrete Mathematics and Its Applications)
Category: 
Keyword: 
CAPapproximation algorithmbenchmarkNP-hardcellular network
 Summary | Full Text:PDF(623.9KB)