Issued Patents All Time
Showing 1–24 of 24 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9419804 | Data authenticity assurance method, management computer, and storage medium | Natsuki Watanabe, Yoko Hashimoto, Kosuke Anzai, Naoki Hayashi, Yoshiaki Isobe +2 more | 2016-08-16 |
| 8108906 | Electronic data authenticity assurance method and program | Yasuo Hatano | 2012-01-31 |
| 8094824 | Encrypting device, decrypting device, information system, encrypting method, decrypting method, and program | Yasuo Hatano, Kenji Matsumoto, Yoji Shimizu | 2012-01-10 |
| 7941667 | Electronic document authenticity guarantee method, and electronic document disclosure system | Yasuo Hatano | 2011-05-10 |
| 7840487 | Digital content encryption and decryption method and workflow system using digital content | Yasuo Hatano, Kenji Matsumoto, Yoji Shimizu | 2010-11-23 |
| 7770009 | Digital signing method | Ryoichi Sasaki, Kazuo Takaragi, Seiichi Susaki, Toshiyuki Moritsu, Mizuhiro Sakai +2 more | 2010-08-03 |
| 7694126 | Method and system for recovering the validity of cryptographically signed digital data | Hiroshi Yoshiura, Seiichi Susaki, Ryoichi Sasaki, Kazuo Takaragi, Hisashi Toyoshima +1 more | 2010-04-06 |
| 7574605 | Method of managing digital signature, apparatus for processing digital signature, and a computer readable medium for recording program of managing digital signature | Kouichi Tanimoto, Shinji Itoh, Narihiro Omoto, Katsuko Nishioka | 2009-08-11 |
| 7526645 | Electronic document authenticity assurance method and electronic document disclosure system | Mitsuru Iwamura, Tsutomu Matsumoto, Ryoichi Sasaki, Hiroshi Yoshiura, Hirokazu Aoshima +3 more | 2009-04-28 |
| 7478432 | Method and system for contents control | Isao Echizen, Hiroshi Yoshiura, Kousuke Anzai, Jun'ichi Taguchi, Kazunori Nakano +1 more | 2009-01-13 |
| 7441115 | Method for verifying a digital signature | Narihiro Omoto, Shinji Itoh, Kouichi Tanimoto, Hiroshi Yoshiura | 2008-10-21 |
| 7401225 | Method and apparatus for publishing signature log entry | Kouichi Tanimoto, Shinji Itoh, Yasuaki Kudo, Yoshiharu Bessho | 2008-07-15 |
| 7359515 | Method and apparatus for symmetric-key decryption | Soichi Furuya, Kazuo Takaragi, Hiroyuki Kurumatani, Masashi Takahashi, Hisayoshi Sato +1 more | 2008-04-15 |
| 7305558 | Digital signing method | Ryoichi Sasaki, Kazuo Takaragi, Seiichi Susaki, Toshiyuki Moritsu, Mizuhiro Sakai +2 more | 2007-12-04 |
| 7210043 | Trusted computer system | Shinji Itoh, Hiroshi Yoshiura, Kazuo Takaragi, Masato Arai, Toshiaki Arai +2 more | 2007-04-24 |
| 7206939 | File storage system and a NAS server | Shinji Itoh, Narihiro Omoto, Yoshiharu Bessho | 2007-04-17 |
| 7200232 | Method and apparatus for symmetric-key decryption | Soichi Furuya, Kazuo Takaragi, Hiroyuki Kurumatani, Masashi Takahashi, Hisayoshi Sato +1 more | 2007-04-03 |
| 7200682 | Time stamp generating system | Seiichi Susaki, Kazuo Takaragi, Hiroshi Yoshiura, Takeshi Matsuki, Hisashi Toyoshima +3 more | 2007-04-03 |
| 7134021 | Method and system for recovering the validity of cryptographically signed digital data | Hiroshi Yoshiura, Seiichi Susaki, Ryoichi Sasaki, Kazuo Takaragi, Hisashi Toyoshima +1 more | 2006-11-07 |
| 7110545 | Method and apparatus for symmetric-key encryption | Soichi Furuya, Kazuo Takaragi, Hiroyuki Kurumatani, Masashi Takahashi, Hisayoshi Sato +1 more | 2006-09-19 |
| 7099002 | Defect detector and method of detecting defect | Tomoaki Ishiura, Katsumi Ichifuji | 2006-08-29 |
| 7047407 | Network system enabling transmission control | Shinji Itoh, Isao Echizen | 2006-05-16 |
| 6873706 | Processing apparatus, program, or system of secret information | Kazuo Takaragi, Yasuko Fukuzawa | 2005-03-29 |
| 6816969 | Digital signature generating method and digital signature verifying method | Ryoichi Sasaki, Kazuo Takaragi, Seiichi Susaki, Hisanori Mishima, Takeshi Matsuki +3 more | 2004-11-09 |