Communication system and method in public key infrastructure
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United States of America Patent
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Sep 14, 2010
Grant Date -
Jan 6, 2005
app pub date -
Sep 29, 2003
filing date -
Jun 12, 2003
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
In a communication system wherein a device and a client communicate data with each other through a network, the device holds a root certificate including a public key in a pair of the public key and a private key and signed with the public key. When data is sent, a certificate creator creates a second certificate including the root certificate designated as a certificate authority at a higher level and signed with the root certificate, and the second certificate is sent to the client. In the client, the root certificate has been stored beforehand, and a verifier verifies the signature of the second certificate with the root certificate.
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