Takeshi SHIMOYAMA


Preimage Attacks on the Step-Reduced RIPEMD-128 and RIPEMD-160
Chiaki OHTAHARA  Yu SASAKI  Takeshi SHIMOYAMA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2012/10/01
Vol. E95-A  No. 10  pp. 1729-1739
Type of Manuscript: PAPER
Category: Cryptography and Information Security
Keyword: 
RIPEMD-128RIPEMD-160hashpreimagemeet-in-the-middle
  Summary |  Full Text:PDF (1.9MB)

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 (455.1KB)

A Strict Evaluation on the Number of Conditions for SHA-1 Collision Search
Jun YAJIMA  Terutoshi IWASAKI  Yusuke NAITO  Yu SASAKI  Takeshi SHIMOYAMA  Thomas PEYRIN  Noboru KUNIHIRO  Kazuo OHTA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2009/01/01
Vol. E92-A  No. 1  pp. 87-95
Type of Manuscript: Special Section PAPER (Special Section on Cryptography and Information Security)
Category: Hash Function
Keyword: 
hash functioncollision searchSHA-1disturbance vector
  Summary |  Full Text:PDF (329KB)

Development of the Lead-Free Brush Material for the High-Load Starter
Ryoichi HONBO  Youichi MURAKAMI  Koichiro SAWA  Hiroyuki WAKABAYASHI  Naruhiko INAYOSHI  Kyoji INUKAI  Takeshi SHIMOYAMA  Naoki MORITA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2007/08/01
Vol. E90-C  No. 8  pp. 1634-1642
Type of Manuscript: PAPER
Category: Electromechanical Devices and Components
Keyword: 
carbon brushstarterleadweartribology
  Summary |  Full Text:PDF (2.2MB)

Development of the Lead-Free Carbon Brush Material for Starters
Ryoichi HONBO  Koichiro SAWA  Youichi MURAKAMI  Hiroyuki WAKABAYASHI  Naruhiko INAYOSHI  Kyoji INUKAI  Takeshi SHIMOYAMA  Naoki MORITA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2005/08/01
Vol. E88-C  No. 8  pp. 1675-1681
Type of Manuscript: Special Section PAPER (Special Section on Recent Development of Electro-Mechanical Devices--Selected Papers from International Session on Electro-Mechanical Devices 2004 (IS-EMD2004)--)
Category: Automotive Application
Keyword: 
carbon brushlead freestarterwearcorrosion
  Summary |  Full Text:PDF (2.8MB)

Theoretical Analysis of χ2 Attack on RC6
Masahiko TAKENAKA  Takeshi SHIMOYAMA  Takeshi KOSHIBA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2004/01/01
Vol. E87-A  No. 1  pp. 28-36
Type of Manuscript: Special Section PAPER (Special Section on Cryptography and Information Security)
Category: Symmetric Cipher
Keyword: 
RC6χ2 attacktransition matrix
  Summary |  Full Text:PDF (322.4KB)

An Efficient Interpolation Attack
Shiho MORIAI  Takeshi SHIMOYAMA  Toshinobu KANEKO 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2000/01/20
Vol. E83-A  No. 1  pp. 39-47
Type of Manuscript: Special Section PAPER (Special Section on Cryptography and Information Security)
Category: 
Keyword: 
cryptanalysisblock cipherinterpolation attackcomputer algebra systemSNAKE
  Summary |  Full Text:PDF (515.8KB)

Improved Higher Order Differential Attack and Its Application to Nyberg-Knudsen's Designed Block Cipher
Takeshi SHIMOYAMA  Shiho MORIAI  Toshinobu KANEKO  Shigeo TSUJII 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1999/09/20
Vol. E82-A  No. 9  pp. 1971-1980
Type of Manuscript: PAPER
Category: Information Security
Keyword: 
block cipherhigher order differential attackKN cipheralgebraic equation
  Summary |  Full Text:PDF (600.2KB)