Issued Patents All Time
Showing 1–25 of 28 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11451403 | Verification method, information processing device, and non-transitory computer-readable storage medium for storing verification program | Rikuhiro KOJIMA, Dai Yamamoto | 2022-09-20 |
| 9772819 | Apparatus and method for generating physical random numbers | Hirotaka KOKUBO, Dai Yamamoto, Masahiko Takenaka, Kazuyoshi Furukawa | 2017-09-26 |
| 9760717 | Communication device, system, and control method | Yumi Sakemi, Yoshinobu Shimokawa, Tadashige Iwao | 2017-09-12 |
| 9712499 | Method and apparatus for cryptographic processing | Yumi Sakemi, Masahiko Takenaka | 2017-07-18 |
| 9614822 | Node device, communication method and network system | Yumi Sakemi | 2017-04-04 |
| 9510216 | Node device and communication control method | Yumi Sakemi, Kazuyoshi Furukawa, Hisashi Kojima, Masahiko Takenaka | 2016-11-29 |
| 9489501 | Authentication method, authentication device, and system | Yumi Sakemi | 2016-11-08 |
| 9386017 | Authentication device, system and method | Yumi Sakemi, Masahiko Takenaka, Masaya Yasuda | 2016-07-05 |
| 9319923 | Node, communication method, and communication system | Masahiko Takenaka, Hisashi Kojima, Kazuyoshi Furukawa | 2016-04-19 |
| 9203800 | Communication method, node, and network system | Masahiko Takenaka, Kazuyoshi Furukawa, Hisashi Kojima | 2015-12-01 |
| 9071420 | Information processing apparatus, tampering detection apparatus, information processing method, tampering detection method, and computer product | Jun Yajima, Masahiko Takenaka | 2015-06-30 |
| 9032203 | Key setting method, node, server, and network system | Masahiko Takenaka, Kazuyoshi Furukawa, Hisashi Kojima | 2015-05-12 |
| 8732454 | Key setting method, node, and network system | Kazuyoshi Furukawa, Hisashi Kojima, Masahiko Takenaka | 2014-05-20 |
| 8719578 | Document verifying apparatus, document verifying method, and computer product | Masahiko Takenaka | 2014-05-06 |
| 8719563 | Key setting method, node, and network system | Hisashi Kojima, Kazuyoshi Furukawa, Masahiko Takenaka | 2014-05-06 |
| 8533483 | Data processing apparatus and digital signature method | Masahiko Takenaka | 2013-09-10 |
| 8452973 | Digital signature method, program, and apparatus | Masahiko Takenaka | 2013-05-28 |
| 8433913 | Apparatus, method, and program for digital signature | Masahiko Takenaka | 2013-04-30 |
| 8433910 | Electronic signature method, apparatus, and recording medium having electronic signature program recorded thereon | Masahiko Takenaka | 2013-04-30 |
| 8391477 | Cryptographic device having tamper resistance to power analysis attack | Kouichi Itoh, Masahiko Takenaka | 2013-03-05 |
| 8335922 | Recording medium, digital information verification apparatus, and digital information verification method | Takashi Yoshioka, Masahiko Takenaka | 2012-12-18 |
| 8312266 | Methods and apparatus for verifying electronic mail | Takashi Yoshioka, Masahiko Takenaka | 2012-11-13 |
| 8037312 | Method and apparatus for digital signature authentication, and computer product | Masahiko Takenaka, Takashi Yoshioka | 2011-10-11 |
| 7970131 | Elliptic curve cryptosystem apparatus, storage medium storing elliptic curve cryptosystem program, and elliptic curve cryptosystem arithmetic method | Tsuyoshi Takagi | 2011-06-28 |
| 7900050 | Digital document management system, digital document management method, and digital document management program | Masahiko Takenaka, Takashi Yoshioka | 2011-03-01 |