Inventor
IWAMURA MITSURU
JP6 patents
Patents
6 patentsUS6775775B1Aug 10, 2004
Method of physical individual authentication and system using the same
HITACHI LTD66 citations95
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
US7305558B1Dec 4, 2007
Digital signing method
HITACHI LTD38 citations91
US6816969B2Nov 9, 2004
Digital signature generating method and digital signature verifying method
HITACHI LTD41 citations91
US7770009B2Aug 3, 2010
Digital signing method
HITACHI LTD6 citations72