METHOD AND SYSTEM FOR PROTECTING BROADCAST SERVICE/CONTENT IN A MOBILE BROADCAST SYSTEM, AND METHOD FOR GENERATING SHORT TERM KEY MESSAGE THEREFOR

• US 20120170748A1
• Filed: 03/16/2012
• Published: 07/05/2012
• Est. Priority Date: 02/27/2006
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: LEE, Byung-Rae, Hwang, Sung-Oh, Lee, Kook-Heui
• Granted Patent: US 9,356,718 B2
• Time in Patent Office: Days
• US Class Current: 380/270
• CPC Class Codes: H04H 60/23 using cryptography, e.g. encryption, authentication, key distribution
• CPC Class Codes: H04H 60/91 Mobile communication networks for accessing the Internet H04H60/85
• CPC Class Codes: H04L 2209/601 Broadcast encryption
• CPC Class Codes: H04L 2209/80 Wireless
• CPC Class Codes: H04L 63/0428 wherein the data content is protected, e.g. by encrypting or encapsulating the payload
• CPC Class Codes: H04L 63/065 for group communications cryptographic mechanisms or cryptographic arrangements for key management involving conference or group key H04L9/0833
• CPC Class Codes: H04L 9/0825 using asymmetric-key encryption or public key infrastructure [PKI], e.g. key signature or public key certificates
• CPC Class Codes: H04L 9/3242 involving keyed hash functions, e.g. message authentication codes [MACs], CBC-MAC or HMAC

Abstract

A terminal and method for receiving a broadcast service by the terminal in a broadcast system are provided. The method includes performing a registration procedure for subscription and reception of the broadcast service through a Browser And Content Mobile Broadcast (BSCAST) Subscription Management (BSM) responsible for managing subscription information; receiving a Long Term Key Message (LTKM), including key information for encryption of the broadcast service, generated from the BSM; receiving a completed Short Term Key Message (STKM), the completed STKM being generated by performing Message Authentication Code (MAC) processing on a partially created STKM; receiving, from a Broadcast Service Distribution/Adaptation (BSD/A) which is responsible for transmitting the broadcast service, an encrypted broadcast service which is encrypted by a Traffic Encryption Key (TEK) for deciphering the broadcast service; and deciphering the encrypted broadcast service by the TEK obtained using the LTKM and the completed STKM.

Claims

1. A method for receiving a broadcast service by a terminal in a broadcast system, the method comprising:

performing a registration procedure for subscription and reception of the broadcast service through a Browser And Content Mobile Broadcast (BSCAST) Subscription Management (BSM) responsible for managing subscription information;

receiving a Long Term Key Message (LTKM), including key information for encryption of the broadcast service, generated from the BSM;

receiving a completed Short Term Key Message (STKM), the completed STKM being generated by performing Message Authentication Code (MAC) processing on a partially created STKM;

receiving, from a Broadcast Service Distribution/Adaptation (BSD/A) which is responsible for transmitting the broadcast service, an encrypted broadcast service which is encrypted by a Traffic Encryption Key (TEK) for deciphering the broadcast service; and

deciphering the encrypted broadcast service by the TEK obtained using the LTKM and the completed STKM.

2. The method of claim 1, wherein the key information includes at least one of a Service Encryption Key (SEK), a Program Encryption Key (PEK), a Service Authentication Key (SAK), and a Program Authentication Key (PAK).

3. The method of claim 1, wherein the completed STKM is generated by the BSM.

4. The method of claim 1, wherein the completed STKM is generated by the BSD/A.

5. The method of claim 1, wherein the partially created STKM includes the TEK.

6. The method of claim 1, wherein deciphering the encrypted broadcast service comprises:

obtaining the key information for encryption and authentication from the received LTKM; and

deciphering the completed STKM using the key information and obtaining the TEK from the deciphered STKM.

7. The method of claim 1, wherein the broadcast service includes content being provided to the terminal.

8. The method of claim 1, wherein the LKTM and the STKM are received in a smart card of the terminal.

9. A terminal for receiving a broadcast service in a broadcast system, the terminal comprising:

a receiver for receiving messages for subscription and reception of the broadcast service and the broadcast service from the broadcast system; and

a controller for performing a registration procedure for subscription and reception of the broadcast service through a Browser And Content Mobile Broadcast (BCAST) Subscription Management (BSM) responsible for managing subscription information, controlling operations of receiving a Long Term Key Message (LTKM), including key information for encryption of the broadcast service, generated from the BSM, receiving a completed Short Term Key Message (STKM), the completed STKM being generated by performing Message Authentication Code (MAC) processing on a partially created STKM, receiving, from a Broadcast Service Distribution/Adaptation (BSD/A) responsible for transmitting the broadcast service, an encrypted broadcast service that is encrypted by a Traffic Encryption Key (TEK) for deciphering the broadcast service, and deciphering the encrypted broadcast service by the TEK obtained using the LTKM and the completed STKM.

10. The terminal of claim 9, wherein the key information includes at least one of a Service Encryption Key (SEK), a Program Encryption Key (PEK), a Service Authentication Key (SAK), and a Program Authentication Key (PAK).

11. The terminal of claim 9, wherein the completed STKM is generated by the BSM.

12. The terminal of claim 9, wherein the completed STKM is generated by the BSD/A.

13. The terminal of claim 9, wherein the partially created STKM includes the TEK.

14. The terminal of claim 9, wherein the controller controls operations of obtaining the key information for encryption and authentication from the received LTKM, and deciphering the completed STKM using the key information and obtaining the TEK from the deciphered STKM.

15. The terminal of claim 9, wherein the broadcast service includes content being provided to the terminal.

16. The terminal of claim 9, wherein the LKTM and the STKM are received in a smart card of the terminal.