Communication system having plurality of nodes sharing a...

Details Communication system having plurality of nodes sharing a... Communication system having plurality of nodes sharing a...

2005-04-28

2009-10-13

Zand, Kambiz (Department: 2434)

Cryptography

Communication system using cryptography

Symmetric key cryptography

C380S042000

Reexamination Certificate

active

07602915

ABSTRACT:
A communication system has a plurality of nodes that perform encrypted communication via a LAN, each using an identical common cipher key. The common cipher key is replaced at fixed or irregular intervals, by being transmitted from a main node in a broadcast mode via the LAN to respective secondary nodes that are to share the key. When the key is successfully received by a secondary node, it returns a confirmation signal. The system can be configured such that a notification list of secondary nodes for which key acquisition has been confirmed is transmitted to all of the secondary nodes.

REFERENCES:
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“Modern Encoding”; by Okamoto et al, published by Sangyozusho Co., Japan; pp. 198-199(discussed on pp 1 and 2 in the specification).

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