PACKET TRANSMITTING AND RECEIVING APPARATUS AND PACKET TRANSMITTING AND RECEIVING METHOD

• US 20100303233A1
• Filed: 05/17/2010
• Published: 12/02/2010
• Est. Priority Date: 05/26/2009
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: INOUE, Toshifumi, Fukuda, Kenji, Fukunaga, Yoshiaki, Fukuda, Isamu, Fukuda, Nobuyuki, Hoshino, Kiyohisa, Hirasawa, Satoru
• Granted Patent: US 8,897,441 B2
• Time in Patent Office: Days
• US Class Current: 380/255
• CPC Class Codes: H04L 2209/08 Randomization, e.g. dummy operations or using noise
• CPC Class Codes: H04L 2209/80 Wireless
• CPC Class Codes: H04L 63/0272 Virtual private networks
• CPC Class Codes: H04L 63/06 for supporting key management in a packet data network cryptographic mechanisms or cryptographic arrangements for key management H04L9/08
• CPC Class Codes: H04L 63/164 at the network layer
• CPC Class Codes: H04L 9/0841 involving Diffie-Hellman or related key agreement protocols
• CPC Class Codes: H04W 12/041 Key generation or derivation
• CPC Class Codes: H04W 12/0471 Key exchange

Abstract

When being triggered by a call setting request that has been made, dummy information that is different from information to be transmitted and is information used for creating a path on which encrypted communication is to be performed is generated. The path on which the encrypted communication is to be performed is established by using the generated dummy information. A responding process of responding to the call setting request is performed after the path on which the encrypted communication is to be performed has been established. Thus, in the case where information that is obtained after the responding process of responding to the call setting request is encrypted and transmitted, it is possible to transmit the information while maintaining the real-time characteristics of the information to be transmitted.

Claims

1. A packet transmitting and receiving apparatus comprising:

an encryption processing unit that, when transmission data to be transmitted to a transmission destination apparatus is received, judges whether an encryption key exchanged with the transmission destination apparatus is registered and that is configured, in a case where the encryption key is registered, so as to encrypt the transmission data by using the encryption key and to transmit the encrypted transmission data to the transmission destination apparatus and, in a case where the encryption key is not registered, so as to exchange the encryption key with the transmission destination apparatus and to register the encryption key;

a substitute data notifying unit that, when a call setting request is received from a controlling unit, notifies the encryption processing unit of dummy transmission data that is equivalent to the transmission data; and

a call setting completion notifying unit that, when the encryption processing unit resisters the encryption key, notifies the controlling unit that a call setting process performed in response to the call setting request has been completed.

2. The packet transmitting and receiving apparatus according to claim 1, wherein when the substitute data notifying unit receives the call setting request from the controlling unit, the substitute data notifying unit notifies the encryption processing unit of the dummy transmission data that contains information requesting that a reply is sent to a transmission origin.

3. The packet transmitting and receiving apparatus according to claim 1, wherein when the substitute data notifying unit receives the call setting request from the controlling unit, the substitute data notifying unit generates the dummy transmission data for each of transmission destination apparatuses each of which is to receive the transmission data.

4. A packet transmitting and receiving method comprising:

notifying, when a call setting request is received from a controlling unit, an encryption processing unit of dummy transmission data that is equivalent to transmission data to be transmitted to a transmission destination apparatus;

judging, when the dummy transmission data provided at the notifying is received, whether an encryption key exchanged with the transmission destination apparatus is registered;

encrypting the dummy transmission data by using the encryption key and transmitting the encrypted dummy transmission data to the transmission destination apparatus in a case where the encryption key is registered;

exchanging the encryption key with the transmission destination apparatus and registering the encryption key in a case where the encryption key is not registered; and

notifying, when the encryption key is registered, the controlling unit that a call setting process performed in response to the call setting request has been completed.

5. The packet transmitting and receiving method according to claim 4, wherein when the call setting request from the controlling unit is received, the notifying the dummy transmission data includes notifying the encryption processing unit of the dummy transmission data that contains information requesting that a reply is sent to a transmission origin.

6. The packet transmitting and receiving method according to claim 4, wherein when the call setting request from the controlling unit is received, the notifying the dummy transmission data includes generating the dummy transmission data for each of transmission destination apparatuses each of which is to receive the transmission data.