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1. US20080098226 - Encryption communication system, apparatus, method, and program

Office United States of America
Application Number 11698200
Application Date 26.01.2007
Publication Number 20080098226
Publication Date 24.04.2008
Publication Kind A1
IPC
H04L 9/00
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
9Arrangements for secret or secure communication
Applicants Fujitsu Limited
Inventors Zokumasui Yuichi
Agents STAAS &; HALSEY LLP
Priority Data 2006284817 19.10.2006 JP
Title
(EN) Encryption communication system, apparatus, method, and program
Abstract
(EN)

A plurality of encryption communication apparatuses to which terminal apparatuses are connected are connected via a network, data received from the terminal apparatus which is a transmission source is encrypted by the encryption communication apparatus and transmitted to the other encryption communication apparatus, and data received from the other encryption communication apparatus is decrypted and transmitted to the terminal apparatus which is a transmission destination. Upon initiation of first communication with the other encryption communication apparatuses, the encryption communication apparatus generates and exchange encryption keys according to an encryption key exchange protocol, records them in the encryption key control table and, and sets validity time so as to control that. The encryption key is subjected to encryption key update when validity time is close; however, even during validity time period, when the state that CPU load is low is determined, the encryption key of the encryption communication apparatus which is a counterpart having a small communication volume is searched, and the encryption key is updated.