Cryptography – Communication system using cryptography – Wireless communication
Reexamination Certificate
2011-01-11
2011-01-11
Zand, Kambiz (Department: 2434)
Cryptography
Communication system using cryptography
Wireless communication
C380S278000, C713S169000, C713S170000, C713S171000, C726S002000
Reexamination Certificate
active
07869601
ABSTRACT:
On ad hoc networks in which connection relationships among communication terminals constantly change, the processing load increases when authentication is performed each time a connection relationship changes. According to this invention, when communication terminals possess the same common key, mutual authentication is conducted with that common key, and when communication terminals do not possess the same common key, mutual authentication is conducted with a public key. Communication terminals that conducted mutual authentication exchange and retain a common key that they selected and common keys received from other communication terminals. When neither communication terminal possesses a common key at authentication, one terminal creates a common key and distributes it to the other terminal, and when one terminal has a common key it creates that common key and distributes it to the other terminal. Further, a common key possessed by a communication terminal corresponding to a relay node is broadcast periodically.
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Ando Eriko
Fukuzawa Yasuko
Ishida Shuichi
Manchu Tetsuo
Matsui Susumu
Antonelli, Terry Stout & Kraus, LLP.
Hitachi , Ltd.
Tran Tongoc
Zand Kambiz
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