Issued Patents All Time
Showing 1–22 of 22 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 12425199 | Cryptographic communication path monitoring system and monitoring method | Mai Nakazawa, Manabu Kobayashi, Koki Ando | 2025-09-23 |
| 12381713 | Encryption communication system, encryption communication apparatus, and encryption communication | Kazuhisa Kaino, Manabu Kobayashi, Koki Ando | 2025-08-05 |
| 10783278 | Signature generation device, signature verification device, signature generation method, and signature verification method | — | 2020-09-22 |
| 10389531 | Authentication system and authentication method | Saburo Toyonaga, Hiroyuki Tanaka | 2019-08-20 |
| 10230997 | Management device and image processing system | Masaaki Kobayashi, Kouji Mutou, Katsunori KOGATA | 2019-03-12 |
| 10015159 | Terminal authentication system, server device, and terminal authentication method | Saburo Toyonaga, Hiroyuki Tanaka, Kenjiro Ike | 2018-07-03 |
| 9883146 | Communication system, communication apparatus and communication method | Masaaki Kobayashi | 2018-01-30 |
| 9742765 | Authentication system and authentication method | Saburo Toyonaga, Hiroyuki Tanaka | 2017-08-22 |
| 9692770 | Signature verification using unidirectional function | Kenjiro Ike, Saburo Toyonaga, Hiroyuki Tanaka | 2017-06-27 |
| 9680639 | Secret sharing apparatus and secret sharing method that restores secret data from at least two of generated shared data | — | 2017-06-13 |
| 9654455 | Communication system, communication device, key management apparatus, and communication method | — | 2017-05-16 |
| 9525557 | Certificate issuing system, client terminal, server device, certificate acquisition method, and certificate issuing method | Hiroyuki Tanaka, Saburo Toyonaga, Kenjiro Ike | 2016-12-20 |
| 9442890 | Distribution apparatus, restoration apparatus, distribution method, restoration method, and distribution and restoration system | — | 2016-09-13 |
| 9331984 | Secret sharing method and system | — | 2016-05-03 |
| 8843747 | Communication apparatus and communication system | — | 2014-09-23 |
| 8737617 | Encryption apparatus, decryption apparatus, encryption method, decryption method, and encryption/decryption system | — | 2014-05-27 |
| 8731196 | Decrypting apparatus, encrypting apparatus, decrypting method, encrypting method, and communication system | — | 2014-05-20 |
| 8577039 | Cryptographic communication apparatus and cryptographic communication system | — | 2013-11-05 |
| 8307208 | Confidential communication method | — | 2012-11-06 |
| 8261088 | Secret authentication system | — | 2012-09-04 |
| 8245040 | Secret authentication system | — | 2012-08-14 |
| 7257838 | Information processing system and information processing method capable of communicating with impermissible protocol | Hiroyuki Tanaka, Yasuhiko Nishimuta | 2007-08-14 |