DHCP CLIENT SERVER SYSTEM, DHCP CLIENT DEVICE AND DHCP SERVER DEVICE
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United States of America Patent
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Issued Date -
Sep 23, 2010
app pub date -
Dec 2, 2008
filing date -
Dec 5, 2007
priority date (Note) -
Abandoned
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Abstract
A conventional DHCP authentication method could not cope with a one-phase two-messages DHCP sequence involved in a Rapid-Commit option. Further, in the conventional DHCP authentication method, it is possible to replay attack at lease renewal timing and, when information used in a retransmission method between a client and a server becomes the loss of synchronization, the conventional DHCP authentication method cannot detect the loss of synchronization and has such a problem that unnecessary traffics are continuously produced. A DHCP client device includes a means that stores a user ID, a secret key, and retransmission detection method (RDM) information. A DHCP server device includes a database that is available for the retrieval of a secret key and RMD information based on a user ID as a key or an access mechanism to an external DB with the same function as that of the database.
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