Issued Patents All Time
Showing 1–25 of 38 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10686768 | Apparatus and method for controlling profile data delivery | Junji Takagi, Ikuya Morikawa, Takao Ogura, Dai Yamamoto, Yumi Sakemi | 2020-06-16 |
| 10270768 | Communication system, communication method, and communication device | Jun Yajima, Takayuki Hasebe, Tsutomu Matsumoto | 2019-04-23 |
| 9793895 | Electronic circuit, latch circuit, and external action detecting circuit | Dai Yamamoto, Ikuya Morikawa | 2017-10-17 |
| 8078661 | Multiple-word multiplication-accumulation circuit and montgomery modular multiplication-accumulation circuit | Kenji Mukaida, Masahiko Takenaka, Shoichi Masui | 2011-12-13 |
| 7792893 | Device and method for calculating conversion parameter of montgomery modular multiplication and program therefor | Kouichi Itoh, Masahiko Takenaka | 2010-09-07 |
| 7639808 | Elliptic curve cryptosystem apparatus, elliptic curve cryptosystem method, elliptic curve cryptosystem program and computer readable recording medium storing the elliptic curve cryptosystem program | Tetsuya Izu, Kouichi Itoh, Masahiko Takenaka | 2009-12-29 |
| 7536011 | Tamper-proof elliptic encryption with private key | Masahiko Takenaka, Tetsuya Izu, Kouichi Itoh | 2009-05-19 |
| 7403965 | Encryption/decryption system for calculating effective lower bits of a parameter for Montgomery modular multiplication | Kenji Mukaida, Masahiko Takenaka, Shoichi Masui | 2008-07-22 |
| 7386130 | Encryption secured against DPA | Koichi Ito, Masahiko Takenaka | 2008-06-10 |
| 7158638 | Encryption circuit | Souichi Okada, Tomohiro Hayashi, Chikahiro Deguchi, Yumi Fujiwara | 2007-01-02 |
| 7065788 | Encryption operating apparatus and method having side-channel attack resistance | Jun Yajima, Kouichi Itoh, Masahiko Takenaka | 2006-06-20 |
| 6956951 | Extended key preparing apparatus, extended key preparing method, recording medium and computer program | Takeshi Shimoyama, Koichi Ito, Masahiko Takenaka, Jun Yajima, Hitoshi Yanami +1 more | 2005-10-18 |
| 6829592 | Data protection system, data preparation device, and data working device | Takayuki Hasebe, Masahiko Takenaka, Souichi Okada, Yuji Kijima | 2004-12-07 |
| 6415310 | Remainder calculating method, modular-multiplication method, remainder calculating apparatus, modular-multiplication apparatus and recording medium | Masahiko Takenaka | 2002-07-02 |
| 6385726 | Software license protection via cryptography | Takayuki Hasebe, Masahiko Takenaka | 2002-05-07 |
| 6330332 | Prime number generation apparatus B-smoothness judgement apparatus and computer memory product | Koichi Itoh, Kazuhiro Yokoyama, Masahiko Takenaka | 2001-12-11 |
| 6272225 | Key recovery condition encryption and decryption apparatuses | Hiroshi Miyauchi, Kazue Sako, Masashi Yamazaki, Seiichi Domyo, Hiroyoshi Tsuchiya +4 more | 2001-08-07 |
| 6266421 | Key recovery system and key recovery method | Seiichi Domyo, Hiroyoshi Tsuchiya, Seiko Kanno, Hiroyuki Ando, Ichirou Morita +4 more | 2001-07-24 |
| 6185308 | Key recovery system | Hiroyuki Ando, Ichirou Morita, Yasutsugu Kuroda, Masashi Yamazaki, Hiroshi Miyauchi +4 more | 2001-02-06 |
| 6173390 | Storage medium driving device, storage medium and data protecting method | Seigo Kotani, Jun Kamada | 2001-01-09 |
| 6118874 | Encrypted data recovery method using split storage key and system thereof | Eiji Okamoto, Masahiro Mambo, Seiichi Domyo, Hiroyoshi Tsuchiya, Tooru Kawai +2 more | 2000-09-12 |
| 6067640 | System for management of software employing memory for processing unit with regulatory information, for limiting amount of use and number of backup copies of software | Ryota Akiyama | 2000-05-23 |
| 5953416 | Data processing apparatus | Takayuki Hasebe, Masahiko Takenaka | 1999-09-14 |
| 5935243 | Licensee notification system | Takayuki Hasebe | 1999-08-10 |
| 5917908 | File protection system, software utilization system using the file protection system and storage medium used in the software utilization system | Masahiko Takenaka, Takayuki Hasebe, Noboru Iwayama | 1999-06-29 |