Watermark payload encryption for media including multiple watermarks

• US 20050262351A1
• Filed: 03/15/2005
• Published: 11/24/2005
• Est. Priority Date: 03/18/2004
• Status: Active Grant

• Current Assignee: Digimarc Corporation
• Original Assignee: Digimarc Corporation
• Inventors: Levy, Kenneth L.
• Granted Patent: US 8,127,137 B2
• Time in Patent Office: Days
• US Class Current: 713/176
• CPC Class Codes: G06T 1/005 Robust watermarking, e.g. average attack or collusion attack resistant
• CPC Class Codes: G06T 2201/0051 Embedding of the watermark in the spatial domain
• CPC Class Codes: G06T 2201/0053 Embedding of the watermark in the coding stream, possibly without decoding; Embedding of the watermark in the compressed domain
• CPC Class Codes: G06T 2201/0061 Embedding of the watermark in each block of the image, e.g. segmented watermarking
• CPC Class Codes: G06T 2201/0065 Extraction of an embedded watermark; Reliable detection
• CPC Class Codes: H04L 2209/608 Watermarking
• CPC Class Codes: H04L 9/08 Key distribution or management, e.g. generation, sharing or updating, of cryptographic keys or passwords network architectures or network communication protocols for supporting key management in a packet data network H04L63/06
• CPC Class Codes: H04N 1/32144 embedded in the image data, i.e. enclosed or integrated in the image, e.g. watermark, super-imposed logo or stamp
• CPC Class Codes: H04N 2201/3239 using a plurality of different authentication information
• CPC Class Codes: H04N 2201/3281 Encryption; Ciphering
• CPC Class Codes: H04N 2201/3284 for error correction

Abstract

The present invention provides encryption techniques useful with digital watermarking payloads. In a first implementation, we encrypt one of two different cooperating watermark payloads, but the encryption and payload data structure helps to authenticate both payloads. Another implementation provides a three encryption key pair system for managing messages and watermark embedding. Still another aspect of the invention is a watermark embedding process that uses encryption to whiten, randomize or spread a message, instead of convention spread-spectrum modulation.

Claims

1. A method to secure a first digital watermark payload and a second digital watermark payload through encryption of only one of the first digital watermark payload and the second digital watermark payload, said method comprising:

providing a checksum over at least a portion of the second digital watermark payload;

combining the checksum with the first digital watermark payload;

encrypting the combined checksum and first digital watermark payload;

embedding a first digital watermark in media, the first digital watermark comprising the encrypted combined checksum and first digital watermark payload; and

embedding a second digital watermark in the media, the second digital watermark comprising the second digital watermark payload.

2. A method comprising:

receiving the embedded media of claim 1;

and

providing the embedded media on a physical object.

3. The method of claim 2, wherein said providing comprises printing or engraving.

4. The method of claim 3, wherein the media comprises a first portion and a second portion, with the first digital watermark being embedded in the first portion, and the second digital watermark being embedded in the second portion.

5. The method of claim 4, wherein the first portion comprises a photographic representation of a human subject.

6. The method of claim 5, wherein the second portion comprises at least one of a background, graphic, photograph or artwork.

7. The method of claim 2, wherein the physical object comprises an identification document.

8. A method to secure a first digital watermark payload and a second digital watermark payload through encryption of only one of the first digital watermark payload and at least a portion of the second digital watermark payload, said method comprising:

providing a checksum over at least a portion of the first digital watermark payload and the second digital watermark payload;

combining the checksum with the second digital watermark payload;

encrypting first digital watermark payload;

embedding a first digital watermark in media, the first digital watermark comprising the encrypted first digital watermark payload; and

embedding a second digital watermark in the media, the second digital watermark comprising the combined checksum and second digital watermark payload.

9. A method comprising:

receiving the embedded media of claim 8;

and

providing the embedded media on a physical object.

10. The method of claim 9, wherein said providing comprises printing or engraving.

11. The method of claim 8 wherein the media comprises a first portion and a second portion, with the first digital watermark being embedded in the first portion, and the second digital watermark being embedded in the second portion.

12. A method to secure a first digital watermark payload and a second digital watermark payload through encryption of only one of the first digital watermark payload and the second digital watermark payload, said method comprising:

providing a first checksum over the first digital watermark payload;

providing a second checksum over the second digital watermark payload;

combining the first checksum, second checksum and first digital watermark payload;

encrypting the combined first checksum, second checksum and first digital watermark payload;

embedding a first digital watermark in media, the first digital watermark comprising the encrypted combined first checksum, second checksum and first digital watermark payload; and

embedding a second digital watermark in the media, the second digital watermark comprising the second digital watermark payload.

13. A method to secure a first digital watermark payload and a second digital watermark payload through encryption of only one of the first digital watermark payload and the second digital watermark payload, said method comprising:

providing information redundantly in the first digital watermark payload and the second digital watermark payload;

encrypting the first digital watermark payload;

embedding a first digital watermark in media, the first digital watermark comprising the encrypted first digital watermark payload; and

embedding a second digital watermark in the media, the second digital watermark comprising the second digital watermark payload.

14. A method comprising:

decrypting media embedded according to claim 13 to obtain the encrypted first digital watermark payload and the second digital watermark payload;

decrypting the encrypted first digital watermark payload;

determining whether the redundant information coincides as expected.