Systems and methods for digital content security

• US 20060045309A1
• Filed: 06/14/2005
• Published: 03/02/2006
• Est. Priority Date: 06/14/2004
• Status: Abandoned Application

• Current Assignee: University of North Carolina At Greensboro (University of North Carolina System)
• Original Assignee: University of North Carolina At Greensboro (University of North Carolina System)
• Inventors: Suthaharan, Shan
• Application Number:
  US11/152,121
• Publication Number:
  US 20060045309A1
• Time in Patent Office: Days
• US Class Current: 382/100
• CPC Class Codes: G06T 1/0042 Fragile watermarking, e.g. so as to detect tampering
• CPC Class Codes: G06T 2201/0051 Embedding of the watermark in the spatial domain
• CPC Class Codes: G06T 2201/0061 Embedding of the watermark in each block of the image, e.g. segmented watermarking
• CPC Class Codes: H04K 1/00 Secret communication
• CPC Class Codes: H04L 2209/608 Watermarking
• CPC Class Codes: H04L 9/0631 Substitution permutation network [SPN], i.e. cipher composed of a number of stages or rounds each involving linear and nonlinear transformations, e.g. AES algorithms
• CPC Class Codes: H04L 9/3247 involving digital signatures
• 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 1/32203 Spatial or amplitude domain methods H04N1/32309 takes precedence
• CPC Class Codes: H04N 1/32219 involving changing the position of selected pixels, e.g. word shifting, or involving modulating the size of image components, e.g. of characters H04N1/32224 takes precedence
• CPC Class Codes: H04N 1/32272 Encryption or ciphering
• CPC Class Codes: H04N 1/32331 Fragile embedding or watermarking
• CPC Class Codes: H04N 1/448 Rendering the image unintelligible, e.g. scrambling
• CPC Class Codes: H04N 1/4486 using digital data encryption

Abstract

The present invention provides systems and methods for digital content security. In one embodiment, a method includes generating an input key, generation of the input key comprising a sequence of operations, the operations including: performing at least one circular-bit-shift operation on a gradient image, and performing at least one block-wise permutation on the gradient image. One such method further includes performing a fragile watermark-embedding algorithm using the input key. Another such method includes utilizing the input key for encryption.

Claims

1. A method for digital watermarking comprising:

generating an input key, generation of the input key comprising a sequence of operations, the operations comprising;

performing at least one circular-bit-shift operation on a gradient image, and

performing at least one block-wise permutation on the gradient image; and

performing a fragile watermark-embedding algorithm using the input key.

2. The method of claim 1, further comprising generating a master key representing the sequence of operations

3. The method of claim 2, wherein the master key comprises a sequence of 0s and 1s.

4. The method of claim 3, wherein each 0 represents a circular-bit-shift and each 1 represents a block-wise permutation.

5. The method of claim 1, wherein the at least one circular-bit-shift operation comprises a plurality of circular-bit-shift operations.

6. The method of claim 1, wherein the at least one block-wise permutation comprises a plurality of block-wise permutations.

7. The method of claim 1, wherein the at least one circular-bit-shift operation is performed before the at least one block-wise permutation.

8. The method of claim 1, wherein the at least one block-wise permutation is performed before the at least one circular-bit-shift operation.

9. The method of claim 1, wherein the sequence of operations, comprises:

performing a first of the at least one circular-bit-shift operation;

performing a first of the at least one block-wise permutation;

performing a second of the at least one circular-bit-shift operation;

performing a second of the at least one block-wise permutation;

performing a third of the at least one block-wise permutation; and

performing a third of the at least one circular-bit-shift operation.

10. The method of claim 1, wherein the gradient image comprises 256×

256 pixels.

11. The method of claim 10, wherein performing the at least one block-wise permutation comprises:

dividing the gradient image into 32×

32 image blocks of 8×

8 pixels; and

applying the block-wise permutation to each of the 32×

32 image blocks.

12. The method of claim 10, wherein performing the at least one circular-bit-shift operation comprises:

dividing the gradient image into 32×

32 image blocks of 8×

8 pixels; and

generating an identification array for each of the 32×

32 image blocks, the identification array comprising 512 bits, the 512 bits ordered from a most significant bit to a least significant bit for each of the 8×

8 pixels.

13. A method comprising:

generating an input key, generation of the input key comprising a sequence of operations, the operations comprising;

performing at least one circular-bit-shift operation on a gradient image, and

performing at least one block-wise permutation on the gradient image; and

encrypting digital content utilizing the input key.

14. A computer-readable medium on which is encoded program code, the program code comprising:

program code for generating an input key, generation of the input key comprising a sequence of operations, the operations comprising;

program code for performing at least one circular-bit-shift operation on a gradient image, and

program code for performing at least one block-wise permutation on the gradient image; and

program code for performing a fragile watermark-embedding algorithm using the input key.

15. A computer-readable medium on which is encoded program code, the program code comprising:

program code for generating an input key, generation of the input key comprising a sequence of operations, the operations comprising;

program code for performing at least one circular-bit-shift operation on a gradient image, and

program code for performing at least one block-wise permutation on the gradient image; and

program code for encrypting digital content utilizing the input key.