Koji CHIDA


Password-Based Authentication Protocol for Secret-Sharing-Based Multiparty Computation
Ryo KIKUCHI Koji CHIDA Dai IKARASHI Koki HAMADA 
Publication:   
Publication Date: 2018/01/01
Vol. E101-A  No. 1  pp. 51-63
Type of Manuscript:  Special Section PAPER (Special Section on Cryptography and Information Security)
Category: 
Keyword: 
passwordauthenticationsecret sharingmultiparty computation
 Summary | Full Text:PDF(1.1MB)

Secret Sharing with Share-Conversion: Achieving Small Share-Size and Extendibility to Multiparty Computation
Ryo KIKUCHI Koji CHIDA Dai IKARASHI Wakaha OGATA Koki HAMADA Katsumi TAKAHASHI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2015/01/01
Vol. E98-A  No. 1  pp. 213-222
Type of Manuscript:  Special Section PAPER (Special Section on Cryptography and Information Security)
Category: Foundation
Keyword: 
secret sharing schememultiparty computationcode-efficiency
 Summary | Full Text:PDF(1.1MB)

Adaptively and Unconditionally Secure Conversion Protocols between Ramp and Linear Secret Sharing
Ryo KIKUCHI Dai IKARASHI Koki HAMADA Koji CHIDA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2015/01/01
Vol. E98-A  No. 1  pp. 223-231
Type of Manuscript:  Special Section PAPER (Special Section on Cryptography and Information Security)
Category: Foundation
Keyword: 
secret sharing schememultiparty computationunconditional securityactive securityhonest majority
 Summary | Full Text:PDF(848.4KB)

Multiparty Computation from El Gamal/Paillier Conversion
Koji CHIDA Hiroaki KIKUCHI Keiichi HIROTA Gembu MOROHASHI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2009/01/01
Vol. E92-A  No. 1  pp. 137-146
Type of Manuscript:  Special Section PAPER (Special Section on Cryptography and Information Security)
Category: Secure Protocol
Keyword: 
encryption conversionmultiparty protocolhomomorphic encryptionprivacy-preserving statistical computation
 Summary | Full Text:PDF(276.2KB)

Secure Multiparty Computation for Comparator Networks
Gembu MOROHASHI Koji CHIDA Keiichi HIROTA Hiroaki KIKUCHI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2008/09/01
Vol. E91-A  No. 9  pp. 2349-2355
Type of Manuscript:  Special Section PAPER (Special Section on Discrete Mathematics and Its Applications)
Category: 
Keyword: 
secure function evaluationcomparator networkmultiparty protocolstatistical analysis(M+1)-st price auction
 Summary | Full Text:PDF(225.2KB)

Batch Processing for Proofs of Partial Knowledge and Its Applications
Koji CHIDA Go YAMAMOTO 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2008/01/01
Vol. E91-A  No. 1  pp. 150-159
Type of Manuscript:  Special Section PAPER (Special Section on Cryptography and Information Security)
Category: Protocols
Keyword: 
batch processingproof of partial knowledgesecure circuit evaluationMIX-net
 Summary | Full Text:PDF(230.5KB)

Non-optimistic Secure Circuit Evaluation Based on ElGamal Encryption and Its Applications
Koji CHIDA Go YAMAMOTO Koutarou SUZUKI Shigenori UCHIYAMA Noburou TANIGUCHI Osamu SHIONOIRI Atsushi KANAI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2007/01/01
Vol. E90-A  No. 1  pp. 128-138
Type of Manuscript:  Special Section PAPER (Special Section on Cryptography and Information Security)
Category: Protocols
Keyword: 
secure circuit evaluationmultiparty protocolElGamal encryptionimplementation
 Summary | Full Text:PDF(467.6KB)

Conversion Schemes for Unlinkable Signatures That Include Revocable Unlinkability
Koji CHIDA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2006/01/01
Vol. E89-A  No. 1  pp. 90-98
Type of Manuscript:  Special Section PAPER (Special Section on Cryptography and Information Security)
Category: Digital Signature
Keyword: 
unlinkabilityanonymous signaturerevocationgroup signaturering signatureMix-net
 Summary | Full Text:PDF(165.4KB)

Flexible-Routing Anonymous Networks Using Optimal Length of Ciphertext
Koji CHIDA Masayuki ABE 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2005/01/01
Vol. E88-A  No. 1  pp. 211-221
Type of Manuscript:  Special Section PAPER (Special Section on Cryptography and Information Security)
Category: Application
Keyword: 
Mix-netHybrid MixOnion Routinganonymity
 Summary | Full Text:PDF(328.9KB)

An Auction Protocol Preserving Privacy of Losing Bids with a Secure Value Comparison Scheme
Koji CHIDA Kunio KOBAYASHI Hikaru MORITA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2004/01/01
Vol. E87-A  No. 1  pp. 173-181
Type of Manuscript:  Special Section PAPER (Special Section on Cryptography and Information Security)
Category: Applications
Keyword: 
sealed-bid auctionvalue comparisoncollision-resistant functiondecision Diffie-Hellman problem
 Summary | Full Text:PDF(270.9KB)

A New Factoring Method of Integers N=pr q for Large r
Koji CHIDA Shigenori UCHIYAMA Taiichi SAITO 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2002/05/01
Vol. E85-A  No. 5  pp. 1050-1053
Type of Manuscript:  Special Section PAPER (Special Section on Discrete Mathematics and Its Applications)
Category: 
Keyword: 
factoringCarmichael functionChinese remainder theoremAdleman-Pomerance-Rumely primality test
 Summary | Full Text:PDF(196KB)