Inventor
SUSAKI SEIICHI
JP16 patents
Patents
16 patentsUS6499105B1Dec 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
US6189032B1Feb 13, 2001
Client-server system for controlling access rights to certain services by a user of a client terminal
HITACHI LTD143 citations97
US5309516AMay 3, 1994
Group cipher communication method and group cipher communication system
HITACHI LTD93 citations96
US6253322B1Jun 26, 2001
Electronic certification authentication method and system
HITACHI LTD154 citations94
US7526645B2Apr 28, 2009
Electronic document authenticity assurance method and electronic document disclosure system
HITACHI LTD31 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
US7305558B1Dec 4, 2007
Digital signing method
HITACHI LTD38 citations91
US6816969B2Nov 9, 2004
Digital signature generating method and digital signature verifying method
HITACHI LTD41 citations91
US6327658B1Dec 4, 2001
Distributed object system and service supply method therein
HITACHI LTD36 citations91
US7386722B2Jun 10, 2008
Certificate management system and method
HITACHI LTD17 citations80
US7694126B2Apr 6, 2010
Method and system for recovering the validity of cryptographically signed digital data
HITACHI LTD7 citations73
US7770009B2Aug 3, 2010
Digital signing method
HITACHI LTD6 citations72
US7357313B2Apr 15, 2008
Information processor-based service providing system and method
HITACHI LTD4 citations58