Katsuyuki TAKASHIMA


Expressive Attribute-Based Encryption with Constant-Size Ciphertexts from the Decisional Linear Assumption
Katsuyuki TAKASHIMA 
Publication:   
Publication Date: 2020/01/01
Vol. E103-A  No. 1  pp. 74-106
Type of Manuscript:  Special Section PAPER (Special Section on Cryptography and Information Security)
Category: 
Keyword: 
attribute-based encryptionconstant-size ciphertextsattribute-based signaturesconstant-size signing keysnon-monotone span programsdecisional linear assumption
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Decentralized Attribute-Based Encryption and Signatures
Tatsuaki OKAMOTO Katsuyuki TAKASHIMA 
Publication:   
Publication Date: 2020/01/01
Vol. E103-A  No. 1  pp. 41-73
Type of Manuscript:  Special Section PAPER (Special Section on Cryptography and Information Security)
Category: 
Keyword: 
attribute-based encryptionattribute-based signaturesdecentralized multi-authority systemnon-monotone predicates
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Adaptively Attribute-Hiding (Hierarchical) Inner Product Encryption
Tatsuaki OKAMOTO Katsuyuki TAKASHIMA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2016/01/01
Vol. E99-A  No. 1  pp. 92-117
Type of Manuscript:  Special Section PAPER (Special Section on Cryptography and Information Security)
Category: 
Keyword: 
functional encryptioninner product encryptionattribute-hiding
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Dual Pairing Vector Spaces and Their Applications
Tatsuaki OKAMOTO Katsuyuki TAKASHIMA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2015/01/01
Vol. E98-A  No. 1  pp. 3-15
Type of Manuscript:  INVITED PAPER (Special Section on Cryptography and Information Security)
Category: 
Keyword: 
bilinear pairingsdual pairing vector spacesDPVSfunctional encryptionattribute-based encryptioninner-product encryptionattribute-based signatures
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Computing a Sequence of 2-Isogenies on Supersingular Elliptic Curves
Reo YOSHIDA Katsuyuki TAKASHIMA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2013/01/01
Vol. E96-A  No. 1  pp. 158-165
Type of Manuscript:  Special Section PAPER (Special Section on Cryptography and Information Security)
Category: Foundations
Keyword: 
isogenysupersingular elliptic curvespost-quantum cryptography
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Efficient (Hierarchical) Inner-Product Encryption Tightly Reduced from the Decisional Linear Assumption
Tatsuaki OKAMOTO Katsuyuki TAKASHIMA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2013/01/01
Vol. E96-A  No. 1  pp. 42-52
Type of Manuscript:  Special Section PAPER (Special Section on Cryptography and Information Security)
Category: Public Key Based Protocols
Keyword: 
functional encryptioninner-product encryptionattribute-hidingtight security reductionshort ciphertexts/secret-keys
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Scaling Security of Elliptic Curves with Fast Pairing Using Efficient Endomorphisms
Katsuyuki TAKASHIMA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2007/01/01
Vol. E90-A  No. 1  pp. 152-159
Type of Manuscript:  Special Section PAPER (Special Section on Cryptography and Information Security)
Category: Elliptic Curve Cryptography
Keyword: 
elliptic curve cryptographypairingID-based cryptography
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Practical Application of Lattice Basis Reduction Algorithm to Side-Channel Analysis on (EC)DSA
Katsuyuki TAKASHIMA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2006/05/01
Vol. E89-A  No. 5  pp. 1255-1262
Type of Manuscript:  Special Section PAPER (Special Section on Discrete Mathematics and Its Applications)
Category: 
Keyword: 
(EC) DSAside-channel analysis (attack)window methodlattice basis reduction algorithm
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A New Type of Fast Endomorphisms on Jacobians of Hyperelliptic Curves and Their Cryptographic Application
Katsuyuki TAKASHIMA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2006/01/01
Vol. E89-A  No. 1  pp. 124-133
Type of Manuscript:  Special Section PAPER (Special Section on Cryptography and Information Security)
Category: Elliptic Curve Cryptography
Keyword: 
elliptic curve cryptographyhyperelliptic curve cryptographyscalar multiplicationGLV methodreal multiplication
 Summary | Full Text:PDF