Inventor
TAKARAGI KAZUO
JP67 patents
Patents
50 patentsUS5315634AMay 24, 1994
Automatic trading method and apparatus
HITACHI LTD270 citations99
US5018196AMay 21, 1991
Method for electronic transaction with digital signature
HITACHI LTD259 citations99
US7061083B1Jun 13, 2006
Semiconductor devices
HITACHI LTD117 citations98
US6873706B1Mar 29, 2005
Processing apparatus, program, or system of secret information
HITACHI LTD102 citations98
US6499105B1Dec 24, 2002
Digital data authentication method
HITACHI LTD174 citations98
US6131162AOct 10, 2000
Digital data authentication method
HITACHI LTD388 citations98
US5465299ANov 7, 1995
Electronic document processing system and method of forming digital signature
HITACHI LTD428 citations98
US5280583AJan 18, 1994
System and method for performing interlocution at a plurality of terminals connected to communication network
HITACHI LTD161 citations98
US6922686B2Jul 26, 2005
Database integration management method and apparatus and processing program, medium therefor
HITACHI LTD121 citations97
US6341349B1Jan 22, 2002
Digital signature generating/verifying method and system using public key encryption
HITACHI LTD102 citations97
US5235641AAug 10, 1993
File encryption method and file cryptographic system
HITACHI LTD259 citations97
US4885788ADec 5, 1989
IC card
HITACHI LTD139 citations97
US7447339B2Nov 4, 2008
Unique code generating apparatus, method, program and recording medium
HITACHI LTD62 citations96
US6592032B1Jul 15, 2003
Control system and method of controlling information written into storage media
HITACHI LTD42 citations96
US6477254B1Nov 5, 2002
Network system using a threshold secret sharing method
HITACHI LTD60 citations96
US6370247B1Apr 9, 2002
Hash value generating method and device, data encryption method and device, data decryption method and device
HITACHI LTD60 citations96
US6141421AOct 31, 2000
Method and apparatus for generating hash value
HITACHI LTD77 citations96
US6122378ASep 19, 2000
Data compression/encryption method and system
HITACHI LTD97 citations96
US6122375ASep 19, 2000
Hash value generating method and device, data encryption method and device, data decryption method and device
HITACHI LTD49 citations96
US6118874ASep 12, 2000
Encrypted data recovery method using split storage key and system thereof
HITACHI LTD255 citations96
US5966448AOct 12, 1999
Cryptographic communication system
HITACHI LTD142 citations96
US5309516AMay 3, 1994
Group cipher communication method and group cipher communication system
HITACHI LTD93 citations96
US5222139AJun 22, 1993
Cryptographic method and apparatus
HITACHI LTD75 citations96
US5144665ASep 1, 1992
Cryptographic communication method and system
HITACHI LTD102 citations96
US5117458AMay 26, 1992
Secret information service system and method
HITACHI LTD111 citations96
US7110545B2Sep 19, 2006
Method and apparatus for symmetric-key encryption
HITACHI LTD62 citations95
US5103479AApr 7, 1992
Encipher method and decipher method
HITACHI LTD45 citations95
US4885777ADec 5, 1989
Electronic transaction system
HITACHI LTD154 citations95
US6157720ADec 5, 2000
Method and apparatus for encrypting data
HITACHI LTD51 citations94
US6714648B2Mar 30, 2004
IC card equipped with elliptic curve encryption processing facility
HITACHI LTD27 citations93
US6466668B1Oct 15, 2002
IC card equipped with elliptical curve encryption processing facility
HITACHI LTD43 citations93
US7210043B2Apr 24, 2007
Trusted computer system
HITACHI LTD21 citations92
US7200682B2Apr 3, 2007
Time stamp generating system
HITACHI LTD21 citations92
US7134021B2Nov 7, 2006
Method and system for recovering the validity of cryptographically signed digital data
HITACHI LTD16 citations92
US6934842B2Aug 23, 2005
Identification code management method and management system
HITACHI LTD32 citations92
US6683956B1Jan 27, 2004
Encrypting conversion apparatus, decrypting conversion apparatus, cryptographic communication system, and electronic toll collection apparatus
HITACHI LTD36 citations92
US6659353B1Dec 9, 2003
Method of checking authenticity of sheet with built-in electronic circuit chip
HITACHI LTD31 citations92
US6311277B1Oct 30, 2001
Method and device for managing computer network
HITACHI LTD42 citations92
US6236729B1May 22, 2001
Key recovery method and system
HITACHI LTD28 citations92
US5218638AJun 8, 1993
Encipher method and decipher method
HITACHI LTD43 citations92
US4982429AJan 1, 1991
Encipher method and decipher method
HITACHI LTD22 citations92
US7305558B1Dec 4, 2007
Digital signing method
HITACHI LTD38 citations91
US7173515B2Feb 6, 2007
RFID tag, and RFID tag-related determining device and method, and management system and method
HITACHI LTD19 citations91
US6816969B2Nov 9, 2004
Digital signature generating method and digital signature verifying method
HITACHI LTD41 citations91
US7298029B2Nov 20, 2007
Semiconductor devices and manufacturing method therefor
HITACHI LTD15 citations84
US7178026B2Feb 13, 2007
Identification code management method and management system
HITACHI LTD11 citations84
US7089388B1Aug 8, 2006
Terminal for use in a system interfacing with storage media
HITACHI LTD11 citations84
US6606385B1Aug 12, 2003
Data encrypting/decrypting conversion methods and apparatuses and data communication system adopting the same
HITACHI LTD14 citations84
US7224796B2May 29, 2007
Pseudorandom number generating apparatus or encryption or decryption apparatus using the same
HITACHI LTD10 citations83
US7138915B2Nov 21, 2006
Handling support method and handling support system
HITACHI LTD12 citations83
Showing the top 50 of 67 patents by PatentIndex Score.