Inventor

KUMAGAI YOKO

JP7 patents

⚠️ This page may combine multiple inventors who share the name “KUMAGAI YOKO”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.

HITACHI LTD

6 patents

US7080251B2Jul 18, 2006

Certificate validity authentication method and apparatus

HITACHI LTD24 citations90

US7533269B2May 12, 2009

Digital-signed digital document exchange supporting method and information processor

HITACHI LTD16 citations83

US7409551B2Aug 5, 2008

Certificate validity authentication method and apparatus

HITACHI LTD13 citations82

US7409553B2Aug 5, 2008

Public key certificate generation method, validation method and apparatus thereof

HITACHI LTD16 citations78

US7558952B2Jul 7, 2009

Method and apparatus for accelerating public-key certificate validation

HITACHI LTD5 citations61

US7392380B2Jun 24, 2008

Authentication and authorization infrastructure system with CRL issuance notification function

HITACHI LTD5 citations58

KUMAGAI YOKO

1 patent

US8516245B2Aug 20, 2013

Method, product and apparatus for accelerating public-key certificate validation

KUMAGAI YOKO1 citations45