SYSTEM AND METHOD FOR TRANSMITTING AND RECEIVING PEER-TO-PEER MESSAGES USING A MEDIA KEY, AND MANAGING THE MEDIA KEY

• US 20140237063A1
• Filed: 09/13/2012
• Published: 08/21/2014
• Est. Priority Date: 09/26/2011
• Status: Abandoned Application

• Current Assignee: Samsung SDS (China) Co., Ltd. (Samsung Group)
• Original Assignee: Samsung SDS (China) Co., Ltd. (Samsung Group)
• Inventors: Yoon, Hee Tae
• Application Number:
  US14/347,577
• Publication Number:
  US 20140237063A1
• Time in Patent Office: Days
• US Class Current: 709/206
• CPC Class Codes: H04L 63/061 for key exchange, e.g. in peer-to-peer networks cryptographic mechanisms or cryptographic arrangements for key agreement H04L9/0838
• CPC Class Codes: H04L 65/1069 Session establishment or de-establishment
• CPC Class Codes: H04L 65/1104 Session initiation protocol [SIP]
• CPC Class Codes: H04L 67/104 Peer-to-peer [P2P] networks

Abstract

A peer-to-peer (P2P) message transmission/reception system, a P2P message transmission/reception system and a media key distributing method using the system are disclosed. The P2P message transmission/reception system includes a transmitting client configured to add a first media key issued from a reception-side relay server to media data to be transmitted to the reception-side relay server, the reception-side relay server configured to issue the first media key to the transmitting client, receive the media data from the transmitting client, replace the first media key added to the received media data with a second media key issued from a receiving client, and transmit the media data having the second media key to the receiving client, and the receiving client configured to issue the second media to the reception-side relay server and receive the media data from the reception-side relay server.

Claims

1. A method of exchanging media keys between a first client, a second client, a first relay server and a second relay sever, the method comprising:

a first step of generating, by the first client, a first message and transmitting the generated first message to the second client via the second relay server;

a second step of generating, by the second client, a second message corresponding to the received first message;

a third step of receiving, by the first relay server, the second message from the second client, and acquiring a media key of the first client which is included in the received second message;

a fourth step of receiving, by the first client, the second message from the first relay server and acquiring a media key of the second relay server which is included in the received second message;

a fifth step of receiving, by the second relay server, a third message from the first client and acquiring a media key of the second client which is included in the received third message; and

a sixth step of receiving, by the second client, the third message from the second relay sever, and acquiring a media key of the first relay server which is included in the received third message.

25. A computer-readable storage medium configured to execute the method according to any one of claims 1 to 6 or claims 21 to 24.

2. The method of clam 1, wherein the first message is a channel establishment message (INVITE), the second message is a channel establishment reply message (ACK) corresponding to the channel establishment message, and the third message is a media data transmission message (PlaceCall).

3. The method of claim 2, wherein the first step further comprises:

generating, by the first client, a media key of the first client, and transmitting a channel establishment message including the generated media key of the first client to the second relay server; and

generating, by the second relay server, a media key of the second relay server, adding the media key of the second relay sever to the channel establishment message received from the first client, and transmitting the channel establishment message to the second client;

wherein the third step further comprises;

receiving, by the second client, the channel establishment message from the second relay sever;

generating, by the second client, a media key of the second client, and transmitting a channel establishment reply message including the media key of the first client, the media key of the second relay server and the media key of the second client to the first relay server; and

acquiring, by the first relay sever, the media key of the first client from the channel establishment reply message received from the second client,

wherein the fourth step further comprises;

generating, by the first relay sever, a media key of the first relay sever, and adding the generated media key of the first relay server to the channel establishment reply message received from the second client, and transmitting the channel establishment reply message to the first client; and

acquiring, by the first client, the media key of the second relay server from the channel establishment reply message received from the first relay server;

wherein the fifth step further comprises;

generating, by the first client, a media data transmission message including the media key of the first client, the media key of the first relay server, the media key of the second client and the media key of the second relay server, and transmitting the generated media data transmission message to the second relay server; and

acquiring, by the second relay server, the media key of the second client from the received media data transmission message, and

wherein the sixth step further comprises;

transmitting, by the second relay server, the received media data transmission message to the second client; and

acquiring, by the second client, the media key of the first relay server from the received media data transmission message.

4. The method of claim 3, wherein the acquiring of the media key of the first client by the first relay server further comprises:

acquiring, by the first relay server, a network address of the first client from the received channel establishment reply message; and

storing, by the first relay sever, the acquired network address of the first client associated to the media key of the first.

5. The method of claim 3, wherein the acquiring of the media key of the second client by the second relay server further comprises:

acquiring, by the second relay server, a network address of the second client from the received media data transmission message; and

storing, by the second relay sever, the acquired network address of the second client associated to the media key of the second client.

6. The method of claim 2, further comprising, posterior to the sixth step:

transmitting, by the first client, a media data transmission stop message to the second relay server;

deleting, by the second relay server, the media key of the second relay server according to the received media data transmission stop message, and transmitting the received media data transmission stop message to the second client;

transmitting, by the second client, a media data transmission stop reply message corresponding to the received media data transmission stop message to the first relay server; and

deleting, by the first relay server, the media key of the first relay server according to the received media data transmission stop reply message, and transmitting the received media data transmission stop reply message to the first client.

7. A media key management system comprising:

a first client configured to generate a first message, transmit the generated first message to a second client via a second relay server, receive a second message transmitted via a first relay server after being transmitted from the second client, and acquire a media key of the second relay server which is included in the received second message;

the first relay server configured to receive the second message corresponding to the first message from the second client, and acquire a media key of the first client which is included in the received second message;

the second relay server configured to receive a third message from the first client, and acquire a media key of the second client included in the received third message; and

the second client configured to receive the third message that is transmitted via the second relay server after being transmitted from the first client, and acquire a media key of the first relay server which is included in the received third message.

8. The system of claim 7, wherein the first message is a channel establishment message (INVITE), the second message is a channel establishment reply message (ACK) corresponding to the channel establishment message, and the third message is a media data transmission message (PlaceCall).

9. The system of claim 8, wherein:

the first client generates a media key of the first client, and transmits a channel establishment message including the generated media key of the first client to the second relay server; and

the second relay server generates a media key of the second relay server, adds the media key of the second relay sever to the channel establishment message received from the first client, and transmits the channel establishment message to the second client.

10. The system of claim 9, wherein:

the second client receives the channel establishment message from the second relay sever, generates a media key of the second client, and transmits a channel establishment reply message including the media key of the first client, the media key of the second relay server and the media key of the second client to the first relay server; and

the first relay sever acquires the media key of the first client from the channel establishment reply message received from the second client.

11. The system of claim 10, wherein:

the first relay server acquires a network address of the first client from the channel establishment reply message received from the second client, stores the acquired network address of the first client associated to the media key of the first client.

12. The system of claim 10, wherein:

the first relay sever generates a media key of the first relay sever, and adds the generated media key of the first relay server to the channel establishment reply message received from the second client, to be transmitted to the first client; and

the first client acquires the media key of the second relay server from the channel establishment reply message received from the first relay server.

13. The system of claim 12, wherein:

the first client generates a media data transmission message including the media key of the first client, the media key of the first relay server, the media key of the second client and the media key of the second relay server, and transmits the generated media data transmission message to the second relay server; and

the second relay server acquires the media key of the second client from the received media data transmission message.

14. The system of claim 13, wherein

the second relay server acquires a network address of the second client from the received media data transmission message, stores the acquired network address of the second client associated to the media key of the second client.

15. The system of claim 13, wherein:

the second relay server transmits the received media data transmission message to the second client; and

the second client acquires the media key of the first relay server from the received media data transmission message.

16. The system of claim 8, wherein:

the first client transmits a media data transmission stop message to the second relay server;

the second relay server deletes the media key of the second relay server according to the received media data transmission stop message, and transmits the received media data transmission stop message to the second client;

the second client transmits a media data transmission stop reply message corresponding to the received media data transmission stop message to the first relay server; and

the first relay server deletes the media key of the first relay server according to the received media data transmission stop reply message, and transmits the received media data transmission stop reply message to the first client.

17. A peer-to-peer (P2P) message transmission/reception system comprising:

a transmitting client configured to add a first media key issued from a reception-side relay server to media data to be transmitted to the reception-side relay server;

the reception-side relay server configured to issue the first media key to the transmitting client, receive the media data from the transmitting client, replace the first media key added to the received media data with a second media key issued from a receiving client, and transmit the media data including the second media key to the receiving client; and

the receiving client configured to issue the second media to the reception-side relay server and receive the media data from the reception-side relay server.

18. The system of claim 17, wherein the reception-side relay server stores and manages a network address of the receiving client corresponding to the second media key, and transmits the media data to the receiving client using the network address of the receiving client.

19. The system of claim 17, wherein, when a media key deletion message is received from the transmitting client, the reception side relay server deletes the first media key, and transmits the received media key deletion message to the receiving client.

20. The system of claim 17, wherein, when new media data is not received from the transmitting client for a predetermined time period, the reception side relay server deletes the first media key.

21. A peer-to-peer (P2P) message transmission/reception method comprising:

adding, by a transmitting client, a first media key issued from a reception-side relay server to media data to be transmitted to the reception-side relay server;

receiving, by the reception-side relay server, the media data from the transmitting client, replacing the first media key added to the received media data with a second media key issued from a receiving client, and transmitting the media data including the second media key to the receiving client; and

receiving, by the receiving client, the media data from the reception-side relay server.

22. The method of claim 21, wherein the reception-side relay server transmits the media data to the receiving client using a network address of the receiving client which is stored in correspondence with the second media key.

23. The method of claim 21, further comprising, posterior to the receiving of the media data:

transmitting, by the transmitting client, a media key deletion message to the reception-side relay server;

deleting, by the reception-side relay server, the previously stored first media key according to the received media key deletion message; and

transmitting, by the reception-side relay server, the received media key deletion message to the receiving client.

24. The method of claim 21, further comprising, after the receiving of the media data:

deleting, by the reception-side relay server, the first media key if new media data is not received from the transmitting client for a predetermined time period.