Device and method for providing video stream having integrity

• US 20080037783A1
• Filed: 03/23/2007
• Published: 02/14/2008
• Est. Priority Date: 06/29/2006
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Park, Kyung-mo, Kim, Hyoung-shick, Chang, Myung-soo
• Granted Patent: US 8,185,742 B2
• Time in Patent Office: Days
• US Class Current: 380/241
• CPC Class Codes: H04N 21/235 Processing of additional data, e.g. scrambling of additional data or processing content descriptors
• CPC Class Codes: H04N 21/23614 Multiplexing of additional data and video streams arrangements for simultaneous broadcast of plural pieces of information H04H20/28
• CPC Class Codes: H04N 21/4348 Demultiplexing of additional data and video streams
• CPC Class Codes: H04N 21/435 Processing of additional data, e.g. decrypting of additional data, reconstructing software from modules extracted from the transport stream
• CPC Class Codes: H04N 7/1675 Providing digital key or authorisation information for generation or regeneration of the scrambling sequence pseudo-random number generators in general G06F7/58

Abstract

Provided are a device and method for providing a video stream, in which a hash value of a frame is included in the header of a video stream, and authentication information about the header is inserted into the video stream, thus ensuring integrity against the forgery of the video stream. The device includes a base frame encoding unit which encodes a base frame, an enhancement frame encoding unit which encodes an enhancement frame, a frame encryption unit which encrypts the encoded base frame and the encoded enhancement frame, a hash processing unit which calculates hash values for the encrypted base frame and the encrypted enhancement frame and hash values included in headers of previous and subsequent video streams, a header management unit which includes information about the encoded base frame and the encoded enhancement frame and the calculated hash values, in a header, and manages the header, and an authentication information creation unit which creates authentication information about the header.

Claims

1. A device for providing a video stream, the device comprising:

a base frame encoding unit which encodes a base frame;

an enhancement frame encoding unit which encodes an enhancement frame;

a frame encryption unit which encrypts the encoded base frame and the encoded enhancement frame;

a hash processing unit which calculates hash values for the encrypted base frame and the encrypted enhancement frame and hash values included in headers of previous and subsequent video streams;

a header management unit including information about the encoded base frame and the encoded enhancement frame and the calculated hash values, in a header, and manages the header; and

an authentication information creation unit which creates authentication information about the header.

2. The device of claim 1, wherein the authentication information about the header comprises one of a digital signature and a message authentication code.

3. The device of claim 1, wherein the base frame and the enhancement frame are encoded using scalable coding.

4. The device of claim 1, wherein the authentication information creation unit collects a plurality of video streams corresponding to a buffer size, and then creates authentication information about a header of a specific video stream among the plurality of video streams.

5. The device of claim 1, further comprising a transmission unit which transmits a video stream into which the authentication information about the header is inserted.

6. A device for providing a video stream, the device comprising:

a reception unit which receives at least one encrypted frame, a header and authentication information about the header, which have been transmitted from a source device;

an authentication information processing unit which checks an integrity of the received header using the received authentication information about the header; and

a transcoding unit which transcodes the encrypted frame based on information included in the header if the integrity of the header has been verified as a result of the checking.

7. The device of claim 6, wherein the authentication information about the header comprises one of a digital signature and a message authentication code.

8. A device for providing a video stream, the device comprising:

a reception unit which receives at least one transcoded frame, a header and authentication information about the header, which have been transmitted from a transcoder;

an authentication information processing unit which checks an integrity of the received header using the received authentication information about the header;

a hash processing unit which determines whether the received frame has been forged based on a hash value included in the header if the integrity of the header has been verified by the authentication information processing unit; and

a decoding unit which decodes the received frame if the frame is determined not to have been forged by the hash processing unit.

9. The device of claim 8, wherein the authentication information about the header comprises one of a digital signature and a message authentication code.

10. A method of providing a video stream, the method comprising:

encoding a base frame and an enhancement frame;

encrypting the encoded base frame and the encoded enhancement frame;

calculating hash values for the encrypted base frame and the encrypted enhancement frame, and hash values included in headers of previous and subsequent video streams;

including information about the encoded base frame and the encoded enhancement frame, and the calculated hash values, in a header; and

creating authentication information about the header.

11. The method of claim 10, wherein the authentication information about the header comprises one of a digital signature and a message authentication code.

12. The method of claim 10, wherein the frames are encoded using scalable coding.

13. The method of claim 10, wherein the creating the authentication information about the header comprises collecting a plurality of video streams corresponding to a buffer size, and creating authentication information about a header of a specific video stream among the plurality of video streams.

14. A method of providing a video stream, the method comprising:

receiving at least one encrypted frame, a header and authentication information about the header, which have been transmitted from a source device;

checking an integrity of the received header using the received authentication information about the header; and

transcoding the encrypted frame based on information included in the header if the integrity of the header has been verified as a result of the checking.

15. The method of claim 14, wherein the authentication information about the header comprises one of a digital signature and a message authentication code.

16. A method of providing a video stream, the method comprising:

receiving at least one transcoded frame, a header and authentication information about the header, which have been transmitted from a transcoder;

checking an integrity of the received header using the received authentication information about the header;

determining whether the received frame has been forged based on a hash value included in the header if the integrity of the header has been verified as a result of the checking; and

decoding the received frame if it is determined that the frame has not been forged as a result of the examination.

17. The method of claim 16, wherein the authentication information about the header comprises one of a digital signature and a message authentication code.