COMMUNICATION SYSTEM, KEY MANAGEMENT/DELIVERY SERVER, TERMINAL APPARATUS, DATA COMMUNICATION METHOD USED FOR THEM, AND PROGRAM THEREOF

Title:

COMMUNICATION SYSTEM, KEY MANAGEMENT/DELIVERY SERVER, TERMINAL APPARATUS, DATA COMMUNICATION METHOD USED FOR THEM, AND PROGRAM THEREOF

Document Type and Number:

WIPO Patent Application WO/2007/018277

Kind Code:

A1

Abstract:

A mobile communication system that prevents unauthorized usage from being done due to a loss of an encrypted key and that can use that encrypted key to safely perform direct communication between terminals. A mobile terminal apparatus (1-1) transmits a trigger of P2P communication to a mobile terminal apparatus (1-n) via a key management/delivery server (3). In response to the transmission/reception of this trigger, the mobile terminal apparatuses (1-1,1-n) establish an IPsec data session with the key management/delivery server (3) via an SIP server (2). Then, the key management/delivery server (3) delivers, to the mobile terminal apparatuses (1-1,1-n), a secret key used for each communication. The mobile terminal apparatuses (1-1,1-n) use the secret key to establish an IPsec data session with each other, thereby performing a P2P communication. The key management/delivery server (3) implements both an exchange for the session and a key delivery control for the establishment of the session between the mobile terminal apparatuses (1-1,1-n)

Inventors:

SAKAGUCHI YASUHIKO (JP)
MISU TOSHIYUKI (JP)
TOMIYAMA TAKUJI (JP)
FUJITA NAOTAKE (JP)

Application Number:

PCT/JP2006/315891

Publication Date:

February 15, 2007

Filing Date:

August 04, 2006

Export Citation:

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Assignee:

NEC CORP (JP)
SAKAGUCHI YASUHIKO (JP)
MISU TOSHIYUKI (JP)
TOMIYAMA TAKUJI (JP)
FUJITA NAOTAKE (JP)

International Classes:

H04L9/08

Foreign References:

JP2004312517A	2004-11-04
JP2004253967A	2004-09-09
JP2002186037A	2002-06-28
JPH10135945A	1998-05-22

Other References: