Issued Patents All Time
Showing 26–50 of 67 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6934842 | Identification code management method and management system | Chikashi Okamoto, Yasuko Fukuzawa | 2005-08-23 |
| 6922686 | Database integration management method and apparatus and processing program, medium therefor | Chikashi Okamoto, Yasuko Fukuzawa, Hideki Tokuyama, Mitsuo Usami | 2005-07-26 |
| 6873706 | Processing apparatus, program, or system of secret information | Kunihiko Miyazaki, Yasuko Fukuzawa | 2005-03-29 |
| 6816969 | Digital signature generating method and digital signature verifying method | Kunihiko Miyazaki, Ryoichi Sasaki, Seiichi Susaki, Hisanori Mishima, Takeshi Matsuki +3 more | 2004-11-09 |
| 6731509 | Method for mounting electronic circuit chip | Chikashi Okamoto, Kazutaka Tsuji, Mitsuo Usami, Chizuko Yasunobu, Asahiko Sobe +2 more | 2004-05-04 |
| 6714648 | IC card equipped with elliptic curve encryption processing facility | Seiji Miyazaki | 2004-03-30 |
| 6683956 | Encrypting conversion apparatus, decrypting conversion apparatus, cryptographic communication system, and electronic toll collection apparatus | Makoto Aikawa, Shigeru Hirahata, Yoshimichi Kudo | 2004-01-27 |
| 6659353 | Method of checking authenticity of sheet with built-in electronic circuit chip | Chikashi Okamoto, Kazutaka Tsuji, Mitsuo Usami, Chizuko Yasunobu, Asahiko Isobe +2 more | 2003-12-09 |
| 6606385 | Data encrypting/decrypting conversion methods and apparatuses and data communication system adopting the same | Makoto Aikawa, Hiroyuki Koreeda, Manabu Sasamoto, Hiroo Okamoto, Takaharu Noguchi +2 more | 2003-08-12 |
| 6592032 | Control system and method of controlling information written into storage media | Chikashi Okamoto | 2003-07-15 |
| 6504931 | Method and apparatus for encrypting data | Hiroshi Yoshiura, Mayuko Shimizu | 2003-01-07 |
| 6499105 | Digital data authentication method | Hiroshi Yoshiura, Ryoichi Sasaki, Seiichi Susaki, Hisashi Toyoshima, Tsukasa Saito | 2002-12-24 |
| 6477254 | Network system using a threshold secret sharing method | Seiji Miyazaki | 2002-11-05 |
| 6466668 | IC card equipped with elliptical curve encryption processing facility | Seiji Miyazaki | 2002-10-15 |
| 6411714 | Data decompression/decryption method and system | Hiroshi Yoshiura, Yusuke Hino, Yutaka Otsu | 2002-06-25 |
| 6370247 | Hash value generating method and device, data encryption method and device, data decryption method and device | Hiroyuki Kurumatani | 2002-04-09 |
| 6341349 | Digital signature generating/verifying method and system using public key encryption | Hiroyuki Kurumatani | 2002-01-22 |
| 6311277 | Method and device for managing computer network | Seiichi Domyo, Hiroshi Yoshiura | 2001-10-30 |
| 6236729 | Key recovery method and system | Hiroyuki Kurumatani | 2001-05-22 |
| 6157720 | Method and apparatus for encrypting data | Hiroshi Yoshiura, Mayuko Shimizu | 2000-12-05 |
| 6141421 | Method and apparatus for generating hash value | Hiroyuki Kurumatani | 2000-10-31 |
| 6131162 | Digital data authentication method | Hiroshi Yoshiura, Ryoichi Sasaki, Seiichi Susaki, Hisashi Toyoshima, Tsukasa Saito | 2000-10-10 |
| 6122378 | Data compression/encryption method and system | Hiroshi Yoshiura, Yusuke Hino, Yutaka Otsu | 2000-09-19 |
| 6122375 | Hash value generating method and device, data encryption method and device, data decryption method and device | Hiroyuki Kurumatani | 2000-09-19 |
| 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 |