Inventor
OHTA KAZUO
JP23 patents
⚠️ This page may combine multiple inventors who share the name “OHTA KAZUO”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
NIPPON TELEGRAPH & TELEPHONE
11 patentsUS5224162AJun 29, 1993
Electronic cash system
NIPPON TELEGRAPH & TELEPHONE194 citations99
US4977595ADec 11, 1990
Method and apparatus for implementing electronic cash
NIPPON TELEGRAPH & TELEPHONE433 citations99
US5901229AMay 4, 1999
Electronic cash implementing method using a trustee
NIPPON TELEGRAPH & TELEPHONE163 citations98
US4969189ANov 6, 1990
Authentication system and apparatus therefor
NIPPON TELEGRAPH & TELEPHONE127 citations98
US5889862AMar 30, 1999
Method and apparatus for implementing traceable electronic cash
NIPPON TELEGRAPH & TELEPHONE101 citations97
US6769063B1Jul 27, 2004
Data converter and recording medium on which program for executing data conversion is recorded
NIPPON TELEGRAPH & TELEPHONE65 citations96
US6212637B1Apr 3, 2001
Method and apparatus for en-bloc verification of plural digital signatures and recording medium with the method recorded thereon
NIPPON TELEGRAPH & TELEPHONE59 citations96
US6038581AMar 14, 2000
Scheme for arithmetic operations in finite field and group operations over elliptic curves realizing improved computational speed
NIPPON TELEGRAPH & TELEPHONE39 citations95
US6202076B1Mar 13, 2001
Scheme for arithmetic operations in finite field and group operations over elliptic curves realizing improved computational speed
NIPPON TELEGRAPH & TELEPHONE16 citations89
US7187769B1Mar 6, 2007
Method and apparatus for evaluating the strength of an encryption
NIPPON TELEGRAPH & TELEPHONE12 citations83
US6266688B1Jul 24, 2001
Scheme for arithmetic operations in finite field and group operations over elliptic curves realizing improved computational speed
NIPPON TELEGRAPH & TELEPHONE12 citations70
TOSHIBA KK
3 patentsUS7496759B2Feb 24, 2009
Multisignature method, apparatus, program, and system
TOSHIBA KK6 citations63
US9984239B2May 29, 2018
Concealing apparatus, decoding apparatus, concealing method, and decoding method
TOSHIBA KK0 citations46
US10027479B2Jul 17, 2018
Generating device, encryption device, decryption device, generating method, encryption method, decryption method, and computer program product
TOSHIBA KK0 citations35