Kouichi ITOH


Privacy-Preserving Decision Tree Learning with Boolean Target Class
Hiroaki KIKUCHI Kouichi ITOH Mebae USHIDA Hiroshi TSUDA Yuji YAMAOKA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2015/11/01
Vol. E98-A  No. 11  pp. 2291-2300
Type of Manuscript:  PAPER
Category: Cryptography and Information Security
Keyword: 
privacydecision tree learningBoolean querypiecewise linear function
 Summary | Full Text:PDF(1.3MB)

Compact Architecture for ASIC and FPGA Implementation of the KASUMI Block Cipher
Dai YAMAMOTO Kouichi ITOH Jun YAJIMA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2011/12/01
Vol. E94-A  No. 12  pp. 2628-2638
Type of Manuscript:  Special Section PAPER (Special Section on VLSI Design and CAD Algorithms)
Category: High-Level Synthesis and System-Level Design
Keyword: 
block cipherKASUMIhardwareASICFPGAcompact implementation
 Summary | Full Text:PDF(945.4KB)

Compact Architecture for ASIC Implementation of the MISTY1 Block Cipher
Dai YAMAMOTO Jun YAJIMA Kouichi ITOH 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2010/01/01
Vol. E93-A  No. 1  pp. 3-12
Type of Manuscript:  Special Section PAPER (Special Section on Cryptography and Information Security)
Category: Symmetric Cryptography
Keyword: 
block cipherMISTY1hardwareASICcompact implementation
 Summary | Full Text:PDF(599.3KB)

Collision-Based Power Attack for RSA with Small Public Exponent
Kouichi ITOH Dai YAMAMOTO Jun YAJIMA Wakaha OGATA 
Publication:   IEICE TRANSACTIONS on Information and Systems
Publication Date: 2009/05/01
Vol. E92-D  No. 5  pp. 897-908
Type of Manuscript:  Special Section PAPER (Special Section on Information and Communication System Security)
Category: Implementation Issues
Keyword: 
power attackcollision attackSPADPARSAwindow methodcountermeasure
 Summary | Full Text:PDF(748.3KB)

Small Secret Key Attack on a Takagi's Variant of RSA
Kouichi ITOH Noboru KUNIHIRO Kaoru KUROSAWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2009/01/01
Vol. E92-A  No. 1  pp. 33-41
Type of Manuscript:  Special Section PAPER (Special Section on Cryptography and Information Security)
Category: Public Key Cryptography
Keyword: 
latticeLLLtrivariate polynomialRSA
 Summary | Full Text:PDF(294KB)

Forgery Attacks on Time-Stamp, Signed PDF and X.509 Certificate
Kouichi ITOH Tetsuya IZU Wakaha OGATA Takeshi SHIMOYAMA Masahiko TAKENAKA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2009/01/01
Vol. E92-A  No. 1  pp. 67-75
Type of Manuscript:  Special Section PAPER (Special Section on Cryptography and Information Security)
Category: Digital Signature
Keyword: 
Bleichenbacher's forgery attackRSASSA-PKCS-v1_5time-stampPDFX.509 certificateAcrobatAcrobat Reader
 Summary | Full Text:PDF(458KB)