Inventor
TOYOSHIMA HISASHI
JP8 patents
Patents
8 patentsUS6499105B1Dec 24, 2002
Digital data authentication method
HITACHI LTD174 citations98
US6131162AOct 10, 2000
Digital data authentication method
HITACHI LTD388 citations98
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
US7010569B2Mar 7, 2006
Method of information display and communication system using the method
HITACHI LTD19 citations77
US7694126B2Apr 6, 2010
Method and system for recovering the validity of cryptographically signed digital data
HITACHI LTD7 citations73
US7406528B2Jul 29, 2008
Method for communication
HITACHI LTD3 citations52