Electrical computers and digital processing systems: support – Multiple computer communication using cryptography – Protection at a particular protocol layer
Reexamination Certificate
2005-04-12
2005-04-12
Moise, Emmanuell L. (Department: 2136)
Electrical computers and digital processing systems: support
Multiple computer communication using cryptography
Protection at a particular protocol layer
C713S152000
Reexamination Certificate
active
06880088
ABSTRACT:
In an apparatus and method for performing secure messaging in a digital communications network, a module sends a registration message including an initial challenge and an identification of itself to the server. In response, the server sends a message, including a response to the module's challenge and a challenge to the module from the server, to the module based on the value and service of the initial challenge. The module uses the validity of the server's response to determine whether a transmitted message is authentic. A valid response corresponds to an authentic message. Alternatively, a server may initiate communications with a module. Once the initial communication is established, messaging typically continues for all transactions between the server and the module for one or more classes of transactions. The authentication process is repeated for each message.
REFERENCES:
patent: 6029164 (2000-02-01), Birrell et al.
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patent: 6151606 (2000-11-01), Mendez
patent: 6463418 (2002-10-01), Todd
patent: 6587874 (2003-07-01), Golla et al.
Gazier Michäel
Strawczynski Leo
Finnegan Henderson Farabow Garrett & Dunner L.L.P.
Moise Emmanuell L.
Nortel Networks Limited
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