Tatsuaki Okamoto

Person

Tokyo, JP

People

Patents Grantslast 30 patents

Information Patent Grant
Decryption device, cryptographic system, and decryption method
- Patent number 11,909,873
- Issue date Feb 20, 2024
- Mitsubishi Electric Corporation
- Katsuyuki Takashima
- G06 - COMPUTING CALCULATING COUNTING
Information Patent Grant
Signature device, verification device, signature method, verificati...
- Patent number 11,888,968
- Issue date Jan 30, 2024
- Mitsubishi Electric Corporation
- Katsuyuki Takashima
- G06 - COMPUTING CALCULATING COUNTING
Information Patent Grant
Cryptographic system
- Patent number 9,722,783
- Issue date Aug 1, 2017
- Mitsubishi Electric Corporation
- Katsuyuki Takashima
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Cryptographic system, cryptographic method, cryptographic program,...
- Patent number 9,413,531
- Issue date Aug 9, 2016
- Mitsubishi Electric Corporation
- Katsuyuki Takashima
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Cryptographic system, cryptographic method, and cryptographic program
- Patent number 9,407,438
- Issue date Aug 2, 2016
- Mitsubishi Electric Corporation
- Katsuyuki Takashima
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Cryptographic processing system, key generation device, encryption...
- Patent number 9,385,867
- Issue date Jul 5, 2016
- Mitsubishi Electric Corporation
- Katsuyuki Takashima
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Cryptographic processing system, cryptographic processing method, c...
- Patent number 9,203,622
- Issue date Dec 1, 2015
- Mitsubishi Electric Corporation
- Katsuyuki Takashima
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Cryptographic processing system, key generation device, encryption...
- Patent number 9,183,411
- Issue date Nov 10, 2015
- Mitsubishi Electric Corporation
- Katsuyuki Takashima
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Signature processing system, key generation device, signature devic...
- Patent number 9,106,408
- Issue date Aug 11, 2015
- Mitsubishi Electric Corporation
- Katsuyuki Takashima
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Cryptographic processing system, key generation device, encryption...
- Patent number 8,938,623
- Issue date Jan 20, 2015
- Mitsubishi Electric Corporation
- Katsuyuki Takashima
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Cryptographic processing system, key generation device, key delegat...
- Patent number 8,929,542
- Issue date Jan 6, 2015
- Mitsubishi Electric Corporation
- Katsuyuki Takashima
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Cryptographic processing system, key generation device, encryption...
- Patent number 8,913,742
- Issue date Dec 16, 2014
- Mitsubishi Electric Corporation
- Katsuyuki Takashima
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Cryptographic processing system, key generation device, key delegat...
- Patent number 8,577,030
- Issue date Nov 5, 2013
- Mitsubishi Electric Corporation
- Katsuyuki Takashima
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Cryptographic processing system
- Patent number 8,559,638
- Issue date Oct 15, 2013
- Mitsubishi Electric Corporation
- Katsuyuki Takashima
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Signature generating apparatus, signature verifying apparatus, and...
- Patent number 8,458,478
- Issue date Jun 4, 2013
- Nippon Telegraph and Telephone Corporation
- Koutarou Suzuki
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Electronic cash implementing method and equipment using user signat...
- Patent number 7,222,108
- Issue date May 22, 2007
- Nippon Telegraph and Telephone Corporation
- Hidemi Moribatake
- G06 - COMPUTING CALCULATING COUNTING
Information Patent Grant
Electronic cash implementing method and equipment using user signat...
- Patent number 6,539,364
- Issue date Mar 25, 2003
- Nippon Telegraph and Telephone Corporation
- Hidemi Moribatake
- G06 - COMPUTING CALCULATING COUNTING
Information Patent Grant
Encryption and decryption devices for public-key cryptosystems and...
- Patent number 6,480,605
- Issue date Nov 12, 2002
- Telegraph and Telephone Corporation
- Shigenori Uchiyama
- G06 - COMPUTING CALCULATING COUNTING
Information Patent Grant
Method and apparatus for en-bloc verification of plural digital sig...
- Patent number 6,212,637
- Issue date Apr 3, 2001
- Nippon Telegraph and Telephone Corporation
- Kazuo Ohta
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Method and system for depositing private key used in RSA cryptosystem
- Patent number 6,072,876
- Issue date Jun 6, 2000
- Nippon Telegraph and Telephone Corporation
- Masanori Obata
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Electronic cash implementing method with a surveillance institution...
- Patent number 6,003,765
- Issue date Dec 21, 1999
- Nippon Telegraph & Telephone Corporation
- Tatsuaki Okamoto
- G06 - COMPUTING CALCULATING COUNTING
Information Patent Grant
Method and apparatus for implementing hierarchical electronic cash
- Patent number 5,926,548
- Issue date Jul 20, 1999
- Nippon Telegraph & Telephone Corporation
- Tatsuaki Okamoto
- G06 - COMPUTING CALCULATING COUNTING
Information Patent Grant
Electronic cash implementing method using a trustee
- Patent number 5,901,229
- Issue date May 4, 1999
- Nippon Telegraph and Telephone Corp.
- Eiichiro Fujisaki
- G06 - COMPUTING CALCULATING COUNTING
Information Patent Grant
Method and apparatus for settlement of accounts by IC cards
- Patent number 5,502,765
- Issue date Mar 26, 1996
- Nippon Telegraph & Telephone Corporation
- Ginya Ishiguro
- G06 - COMPUTING CALCULATING COUNTING
Information Patent Grant
Method and apparatus for settlement of accounts by IC cards
- Patent number 5,446,796
- Issue date Aug 29, 1995
- Nippon Telegraph & Telephone Corporation
- Ginya Ishiguro
- G06 - COMPUTING CALCULATING COUNTING
Information Patent Grant
Method and apparatus for settlement of accounts by IC cards
- Patent number 5,396,558
- Issue date Mar 7, 1995
- Nippon Telegraph & Telephone Corporation
- Ginya Ishiguro
- G06 - COMPUTING CALCULATING COUNTING
Information Patent Grant
Electronic cash system
- Patent number 5,224,162
- Issue date Jun 29, 1993
- Nippon Telegraph & Telephone Corporation
- Tatsuaki Okamoto
- G06 - COMPUTING CALCULATING COUNTING
Information Patent Grant
Method and apparatus for implementing electronic cash
- Patent number 4,977,595
- Issue date Dec 11, 1990
- Nippon Telegraph & Telephone Corporation
- Kazuo Ohta
- G06 - COMPUTING CALCULATING COUNTING
Information Patent Grant
Authentication system and apparatus therefor
- Patent number 4,969,189
- Issue date Nov 6, 1990
- Nippon Telegraph & Telephone Corporation
- Kazuo Ohta
- G06 - COMPUTING CALCULATING COUNTING
Information Patent Grant
Signed document transmission system
- Patent number 4,625,076
- Issue date Nov 25, 1986
- Nippon Telegraph & Telephone Public Corporation
- Tatsuaki Okamoto
- H04 - ELECTRIC COMMUNICATION TECHNIQUE

Patents Applicationslast 30 patents

Information Patent Application
SIGNATURE DEVICE, VERIFICATION DEVICE, SIGNATURE METHOD, VERIFICATI...
- Publication number 20210359848
- Publication date Nov 18, 2021
- Mitsubishi Electric Corporation
- Katsuyuki TAKASHIMA
- G06 - COMPUTING CALCULATING COUNTING
Information Patent Application
DECRYPTION DEVICE, CRYPTOGRAPHIC SYSTEM, AND DECRYPTION METHOD
- Publication number 20210234676
- Publication date Jul 29, 2021
- Mitsubishi Electric Corporation
- Katsuyuki TAKASHIMA
- G06 - COMPUTING CALCULATING COUNTING
Information Patent Application
CRYPTOGRAPHIC SYSTEM
- Publication number 20150229472
- Publication date Aug 13, 2015
- MITSUBISHI ELECTRIC CORPORAITON
- Katsuyuki Takashima
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
CRYPTOGRAPHIC SYSTEM, CRYPTOGRAPHIC METHOD, CRYPTOGRAPHIC PROGRAM,...
- Publication number 20150098566
- Publication date Apr 9, 2015
- MITSUBISHI ELECTRIC CORPORATION
- Katsuyuki Takashima
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
CRYPTOGRAPHIC SYSTEM, CRYPTOGRAPHIC METHOD, AND CRYPTOGRAPHIC PROGRAM
- Publication number 20150010147
- Publication date Jan 8, 2015
- MITSUBISHI ELECTRIC CORPORATION
- Katsuyuki Takashima
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
CRYPTOGRAPHIC PROCESSING SYSTEM, CRYPTOGRAPHIC PROCESSING METHOD, C...
- Publication number 20140298028
- Publication date Oct 2, 2014
- MITSUBISHI ELECTRIC CORPORATION
- Katsuyuki Takashima
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
CRYPTOGRAPHIC PROCESSING SYSTEM, KEY GENERATION DEVICE, ENCRYPTION...
- Publication number 20130336474
- Publication date Dec 19, 2013
- Nippon Telegraph and Telephone Corporation
- Katsuyuki Takashima
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
CRYPTOGRAPHIC PROCESSING SYSTEM, KEY GENERATION DEVICE, ENCRYPTION...
- Publication number 20130339754
- Publication date Dec 19, 2013
- Nippon Telegraph and Telephone Corporation
- Katsuyuki Takashima
- G06 - COMPUTING CALCULATING COUNTING
Information Patent Application
SIGNATURE PROCESSING SYSTEM, KEY GENERATION DEVICE, SIGNATURE DEVIC...
- Publication number 20130322627
- Publication date Dec 5, 2013
- NIPPON TELEGRAPH AND TELEPHONE CORPORATION
- Katsuyuki Takashima
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
CRYPTOGRAPHIC PROCESSING SYSTEM, KEY GENERATION DEVICE, ENCRYPTION...
- Publication number 20130173929
- Publication date Jul 4, 2013
- Nippon Telegraph and Telephone Corporation
- Katsuyuki Takashima
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
CRYPTOGRAPHIC PROCESSING SYSTEM, KEY GENERATION DEVICE, KEY DELEGAT...
- Publication number 20130039489
- Publication date Feb 14, 2013
- Nippon Telegraph and Telephone Corporation
- Katsuyuki Takashima
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
CRYPTOGRAPHIC PROCESSING SYSTEM, KEY GENERATION DEVICE, ENCRYPTION...
- Publication number 20130028415
- Publication date Jan 31, 2013
- Nippon Telegraph and Telephone Corporation
- Katsuyuki Takashima
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
CRYPTOGRAPHIC PROCESSING SYSTEM, KEY GENERATION DEVICE, KEY DELEGAT...
- Publication number 20120284530
- Publication date Nov 8, 2012
- Nippon Telegraph and Telephone Corporation
- Katsuyuki Takashima
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
CRYPTOGRAPHIC PROCESSING SYSTEM
- Publication number 20120045056
- Publication date Feb 23, 2012
- Nippon Telegraph and Telephone Corp.
- Katsuyuki Takashima
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
SIGNATURE GENERATING APPARATUS, SIGNATURE VERIFYING APPARATUS, AND...
- Publication number 20100268957
- Publication date Oct 21, 2010
- Nippon Telegraph and Telephone Corporation
- Koutarou Suzuki
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
Electronic cash implementing method and equipment using user signat...
- Publication number 20040083182
- Publication date Apr 29, 2004
- Nippon Telegraph and Telephone Corporation
- Hidemi Moribatake
- G06 - COMPUTING CALCULATING COUNTING
Information Patent Application
ELECTRONIC CASH IMPLEMENTING METHOD AND EQUIPMENT USING USER SIGNAT...
- Publication number 20010049667
- Publication date Dec 6, 2001
- HIDEMI MORIBATAKE
- G06 - COMPUTING CALCULATING COUNTING

Tatsuaki Okamoto

Person

Patents Grantslast 30 patents

Decryption device, cryptographic system, and decryption method

Signature device, verification device, signature method, verificati...

Cryptographic system

Cryptographic system, cryptographic method, cryptographic program,...

Cryptographic system, cryptographic method, and cryptographic program

Cryptographic processing system, key generation device, encryption...

Cryptographic processing system, cryptographic processing method, c...

Cryptographic processing system, key generation device, encryption...

Signature processing system, key generation device, signature devic...

Cryptographic processing system, key generation device, encryption...

Cryptographic processing system, key generation device, key delegat...

Cryptographic processing system, key generation device, encryption...

Cryptographic processing system, key generation device, key delegat...

Cryptographic processing system

Signature generating apparatus, signature verifying apparatus, and...

Electronic cash implementing method and equipment using user signat...

Electronic cash implementing method and equipment using user signat...

Encryption and decryption devices for public-key cryptosystems and...

Method and apparatus for en-bloc verification of plural digital sig...

Method and system for depositing private key used in RSA cryptosystem

Electronic cash implementing method with a surveillance institution...

Method and apparatus for implementing hierarchical electronic cash

Electronic cash implementing method using a trustee

Method and apparatus for settlement of accounts by IC cards

Method and apparatus for settlement of accounts by IC cards

Method and apparatus for settlement of accounts by IC cards

Electronic cash system

Method and apparatus for implementing electronic cash

Authentication system and apparatus therefor

Signed document transmission system

Patents Applicationslast 30 patents

SIGNATURE DEVICE, VERIFICATION DEVICE, SIGNATURE METHOD, VERIFICATI...

DECRYPTION DEVICE, CRYPTOGRAPHIC SYSTEM, AND DECRYPTION METHOD

CRYPTOGRAPHIC SYSTEM

CRYPTOGRAPHIC SYSTEM, CRYPTOGRAPHIC METHOD, CRYPTOGRAPHIC PROGRAM,...

CRYPTOGRAPHIC SYSTEM, CRYPTOGRAPHIC METHOD, AND CRYPTOGRAPHIC PROGRAM

CRYPTOGRAPHIC PROCESSING SYSTEM, CRYPTOGRAPHIC PROCESSING METHOD, C...

CRYPTOGRAPHIC PROCESSING SYSTEM, KEY GENERATION DEVICE, ENCRYPTION...

CRYPTOGRAPHIC PROCESSING SYSTEM, KEY GENERATION DEVICE, ENCRYPTION...

SIGNATURE PROCESSING SYSTEM, KEY GENERATION DEVICE, SIGNATURE DEVIC...

CRYPTOGRAPHIC PROCESSING SYSTEM, KEY GENERATION DEVICE, ENCRYPTION...

CRYPTOGRAPHIC PROCESSING SYSTEM, KEY GENERATION DEVICE, KEY DELEGAT...

CRYPTOGRAPHIC PROCESSING SYSTEM, KEY GENERATION DEVICE, ENCRYPTION...

CRYPTOGRAPHIC PROCESSING SYSTEM, KEY GENERATION DEVICE, KEY DELEGAT...

CRYPTOGRAPHIC PROCESSING SYSTEM

SIGNATURE GENERATING APPARATUS, SIGNATURE VERIFYING APPARATUS, AND...

Electronic cash implementing method and equipment using user signat...

ELECTRONIC CASH IMPLEMENTING METHOD AND EQUIPMENT USING USER SIGNAT...