Inventor · disambiguated record
Kazuo Takaragi
Also filed as: TAKARAGI KAZUO
67 granted patents·5 pending applications·4,702 citations·filing 1987–2007
99Inventor score
Top patents by PatentIndex Score
72 records- 0197US6499105B1Digital data authentication methodHITACHI LTD·Filed 2000·Granted Dec 24, 2002·174 cites·60 claims
- 0297US6131162ADigital data authentication methodHITACHI LTD·Filed 1998·Granted Oct 10, 2000·388 cites·63 claims
- 0397US5465299AElectronic document processing system and method of forming digital signatureHITACHI LTD·Filed 1993·Granted Nov 7, 1995·428 cites·18 claims
- 0497US5018196AMethod for electronic transaction with digital signatureHITACHI LTD·Filed 1989·Granted May 21, 1991·259 cites·9 claims
- 0593US6922686B2Database integration management method and apparatus and processing program, medium thereforHITACHI LTD·Filed 2001·Granted Jul 26, 2005·121 cites·11 claims
- 0693US5235641AFile encryption method and file cryptographic systemHITACHI LTD·Filed 1991·Granted Aug 10, 1993·259 cites·15 claims
- 0792US6122378AData compression/encryption method and systemHITACHI LTD·Filed 1995·Granted Sep 19, 2000·97 cites·6 claims
- 0891US7061083B1Semiconductor devicesHITACHI LTD·Filed 1999·Granted Jun 13, 2006·117 cites·2 claims
- 0989US7110545B2Method and apparatus for symmetric-key encryptionHITACHI LTD·Filed 2001·Granted Sep 19, 2006·62 cites·22 claims
- 1089US6370247B1Hash value generating method and device, data encryption method and device, data decryption method and deviceHITACHI LTD·Filed 2000·Granted Apr 9, 2002·60 cites·26 claims
- 1188US7298029B2Semiconductor devices and manufacturing method thereforHITACHI LTD·Filed 2005·Granted Nov 20, 2007·15 cites·10 claims
- 1288US6592032B1Control system and method of controlling information written into storage mediaHITACHI LTD·Filed 2000·Granted Jul 15, 2003·42 cites·12 claims
- 1388US6118874AEncrypted data recovery method using split storage key and system thereofHITACHI LTD·Filed 1998·Granted Sep 12, 2000·255 cites·22 claims
- 1487US5280583ASystem and method for performing interlocution at a plurality of terminals connected to communication networkHITACHI LTD·Filed 1992·Granted Jan 18, 1994·161 cites·9 claims
- 1586US6934842B2Identification code management method and management systemHITACHI LTD·Filed 2001·Granted Aug 23, 2005·32 cites·41 claims
- 1683US7305558B1Digital signing methodHITACHI LTD·Filed 2000·Granted Dec 4, 2007·38 cites·14 claims
- 1783US7178026B2Identification code management method and management systemHITACHI LTD·Filed 2005·Granted Feb 13, 2007·11 cites·7 claims
- 1882US6816969B2Digital signature generating method and digital signature verifying methodHITACHI LTD·Filed 2001·Granted Nov 9, 2004·41 cites·13 claims
- 1982US5117458ASecret information service system and methodHITACHI LTD·Filed 1990·Granted May 26, 1992·111 cites·19 claims
- 2081US7447339B2Unique code generating apparatus, method, program and recording mediumHITACHI LTD·Filed 2004·Granted Nov 4, 2008·62 cites·7 claims
- 2181US7330949B2Terminal for use in a system interfacing with storage mediaHITACHI LTD·Filed 2006·Granted Feb 12, 2008·8 cites·7 claims
- 2281US6714648B2IC card equipped with elliptic curve encryption processing facilityHITACHI LTD·Filed 2002·Granted Mar 30, 2004·27 cites·6 claims
- 2381US6411714B1Data decompression/decryption method and systemHITACHI LTD·Filed 2000·Granted Jun 25, 2002·17 cites·6 claims
- 2481US5966448ACryptographic communication systemHITACHI LTD·Filed 1996·Granted Oct 12, 1999·142 cites·52 claims
- 2580US5144665ACryptographic communication method and systemHITACHI LTD·Filed 1991·Granted Sep 1, 1992·102 cites·13 claims
- 2679US7694126B2Method and system for recovering the validity of cryptographically signed digital dataHITACHI LTD·Filed 2005·Granted Apr 6, 2010·7 cites·11 claims
- 2779US7089388B1Terminal for use in a system interfacing with storage mediaHITACHI LTD·Filed 2003·Granted Aug 8, 2006·11 cites·10 claims
- 2879US5309516AGroup cipher communication method and group cipher communication systemHITACHI LTD·Filed 1993·Granted May 3, 1994·93 cites·17 claims
- 2978US6873706B1Processing apparatus, program, or system of secret informationHITACHI LTD·Filed 1999·Granted Mar 29, 2005·102 cites·15 claims
- 3077US6341349B1Digital signature generating/verifying method and system using public key encryptionHITACHI LTD·Filed 1997·Granted Jan 22, 2002·102 cites·25 claims
- 3177US5315634AAutomatic trading method and apparatusHITACHI LTD·Filed 1990·Granted May 24, 1994·270 cites·41 claims
- 3276US7770009B2Digital signing methodHITACHI LTD·Filed 2007·Granted Aug 3, 2010·6 cites·9 claims
- 3376US7138915B2Handling support method and handling support systemHITACHI LTD·Filed 2002·Granted Nov 21, 2006·12 cites·17 claims
- 3476US5222139ACryptographic method and apparatusHITACHI LTD·Filed 1991·Granted Jun 22, 1993·75 cites·12 claims
- 3575US7200682B2Time stamp generating systemHITACHI LTD·Filed 2002·Granted Apr 3, 2007·21 cites·8 claims
- 3674US7309019B2Method of checking authenticity of sheet with built-in electronic circuit chipHITACHI LTD·Filed 2006·Granted Dec 18, 2007·3 cites·6 claims
- 3774US7210043B2Trusted computer systemHITACHI LTD·Filed 2002·Granted Apr 24, 2007·21 cites·16 claims
- 3874US7134021B2Method and system for recovering the validity of cryptographically signed digital dataHITACHI LTD·Filed 2001·Granted Nov 7, 2006·16 cites·40 claims
- 3972US6141421AMethod and apparatus for generating hash valueHITACHI LTD·Filed 1997·Granted Oct 31, 2000·77 cites·7 claims
- 4070US6659353B1Method of checking authenticity of sheet with built-in electronic circuit chipHITACHI LTD·Filed 1999·Granted Dec 9, 2003·31 cites·15 claims
- 4168US7173515B2RFID tag, and RFID tag-related determining device and method, and management system and methodHITACHI LTD·Filed 2003·Granted Feb 6, 2007·19 cites·19 claims
- 4268US4885788AIC cardHITACHI LTD·Filed 1987·Granted Dec 5, 1989·139 cites·4 claims
- 4368US4885777AElectronic transaction systemHITACHI LTD·Filed 1988·Granted Dec 5, 1989·154 cites·4 claims
- 4467US6477254B1Network system using a threshold secret sharing methodHITACHI LTD·Filed 1999·Granted Nov 5, 2002·60 cites·14 claims
- 4567US6466668B1IC card equipped with elliptical curve encryption processing facilityHITACHI LTD·Filed 1999·Granted Oct 15, 2002·43 cites·6 claims
- 4667US5218638AEncipher method and decipher methodHITACHI LTD·Filed 1991·Granted Jun 8, 1993·43 cites·18 claims
- 4766US6504931B1Method and apparatus for encrypting dataHITACHI LTD·Filed 2000·Granted Jan 7, 2003·10 cites·12 claims
- 4866US6122375AHash value generating method and device, data encryption method and device, data decryption method and deviceHITACHI LTD·Filed 1998·Granted Sep 19, 2000·49 cites·14 claims
- 4966US5103479AEncipher method and decipher methodHITACHI LTD·Filed 1990·Granted Apr 7, 1992·45 cites·10 claims
- 5065US7359515B2Method and apparatus for symmetric-key decryptionHITACHI LTD·Filed 2006·Granted Apr 15, 2008·2 cites·10 claims
Showing the top 50 of 72 patent records by PatentIndex Score.
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