Issued Patents All Time
Showing 1–25 of 28 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 12388621 | Cryptographic system, encryption device, decryption device, and key generation device | — | 2025-08-12 |
| 11909873 | Decryption device, cryptographic system, and decryption method | Tatsuaki Okamoto, Pratish Datta | 2024-02-20 |
| 11888968 | Signature device, verification device, signature method, verification method, and computer readable medium | Tatsuaki Okamoto, Pratish Datta | 2024-01-30 |
| 11533176 | Decryption device, encryption device, and cryptographic system | Junichi TOMIDA | 2022-12-20 |
| 11171778 | Key sharing device, key sharing method, and computer readable medium | Atsushi Fujioka | 2021-11-09 |
| 10516534 | Cryptographic system and key generation apparatus | — | 2019-12-24 |
| 9979536 | Cryptographic system, encryption device, re-encryption key generation device, re-encryption device, and cryptographic program | Yutaka Kawai | 2018-05-22 |
| 9755823 | Cryptographic system, cryptographic method, and computer readable medium | Yutaka Kawai | 2017-09-05 |
| 9722783 | Cryptographic system | Tatsuaki Okamoto | 2017-08-01 |
| 9640090 | Cryptographic system and computer readable medium | — | 2017-05-02 |
| 9413531 | Cryptographic system, cryptographic method, cryptographic program, and decryption device | Tatsuaki Okamoto | 2016-08-09 |
| 9407438 | Cryptographic system, cryptographic method, and cryptographic program | Tatsuaki Okamoto | 2016-08-02 |
| 9385867 | Cryptographic processing system, key generation device, encryption device, decryption device, key delegation device, cryptographic processing method, and cryptographic processing program | Tatsuaki Okamoto | 2016-07-05 |
| 9344276 | Cryptographic system, re-encryption key generation device, re-encryption device, cryptographic method, and cryptographic program | Yutaka Kawai | 2016-05-17 |
| 9237013 | Encrypted data management device, encrypted data management method, and encrypted data management program | Sachihiro Ichikawa, Nori Matsuda, Tadakazu YAMANAKA | 2016-01-12 |
| 9203622 | Cryptographic processing system, cryptographic processing method, cryptograhpic processing program, and key generation device | Tatsuaki Okamoto | 2015-12-01 |
| 9183411 | Cryptographic processing system, key generation device, encryption device, decryption device, cryptographic processing method, and cryptographic processing program utilizing attribute information for generation of a key for decryption or encryption | Tatsuaki Okamoto | 2015-11-10 |
| 9106408 | Signature processing system, key generation device, signature device, verification device, signature processing method, and signature processing program | Tatsuaki Okamoto | 2015-08-11 |
| 8958552 | Data processing device | Mitsuhiro Hattori, Yoichi Shibata, Takashi Ito, Nori Matsuda, Takeshi Yoneda | 2015-02-17 |
| 8938623 | Cryptographic processing system, key generation device, encryption device, decryption device, cryptographic processing method, and cryptographic processing program | Tatsuaki Okamoto | 2015-01-20 |
| 8929542 | Cryptographic processing system, key generation device, key delegation device, encryption device, decryption device, cryptographic processing method, and cryptographic processing program | Tatsuaki Okamoto | 2015-01-06 |
| 8913742 | Cryptographic processing system, key generation device, encryption device, decryption device, signature processing system, signature device, and verification device | Tatsuaki Okamoto | 2014-12-16 |
| 8577030 | Cryptographic processing system, key generation device, key delegation device, encryption device, decryption device, cryptographic processing method, and cryptographic processing program | Tatsuaki Okamoto | 2013-11-05 |
| 8559638 | Cryptographic processing system | Tatsuaki Okamoto | 2013-10-15 |
| 8458479 | Verification apparatus | — | 2013-06-04 |