Systems and methods for embedding data in remote session displays
Systems and methods for embedding data in a dynamic image of a remote session display. The method includes, by a processor: receiving a display frame associated with the dynamic image, receiving data to be embedded in the display frame, identifying one or more stable regions in the display frame, upon identification of the one or more stable regions, updating a cache, identifying a largest stable region corresponding to the display frame in the cache, and embedding the data to be embedded in the largest stable region to create a region including embedded data. The cache includes a plurality of stable regions corresponding to one or more display frames associated with the dynamic image.
1. A method for embedding data in a dynamic image of a remote session display, the method comprising, by a processor:
receiving a display frame associated with the dynamic image;
receiving data to be embedded in the display frame;
identifying one or more stable regions in the display frame;
upon identification of the one or more stable regions, updating a cache, wherein the cache comprises a plurality of stable regions corresponding to one or more display frames associated with the dynamic image;
identifying, in the cache, a largest stable region corresponding to the display frame; and
embedding the data to be embedded in the largest stable region to create a region including embedded data.
2. The method of claim 1 , further comprising, by the processor, composing a composite frame by replacing an area corresponding to the largest stable region in the display frame with the region including embedded data.
3. The method of claim 1 , further comprising, by the processor, encrypting the data to be embedded before performing the embedding.
4. The method of claim 1 , further comprising, by the processor, before embedding the data to be embedded in the largest stable region:
determining whether the largest stable region already includes the data to be embedded; and
performing the embedding only if the largest stable region does not include the data to be embedded.
5. The method of claim 1 , further comprising, by the processor, before embedding the data to be embedding in the largest stable region:
determining whether a size of the largest stable region is less than a threshold size; and
performing the embedding in the largest stable region only if the size of the largest stable region is not less than threshold size.
6. The method of claim 5 , further comprising, in response to determining that the size of the largest stable region is less than the threshold size, embedding the data to be embedded in the display frame using a least significant bit algorithm.
7. The method of claim 5 , wherein the threshold size is equal to at least four times a length of the data to be embedded.
8. The method of claim 5 , wherein performing the embedding in the largest stable region comprises:
performing a transform function on the largest stable region to create a frequency domain representation of the largest stable region;
creating an empty bitmap;
embedding the data to be embedded in the empty bitmap to create a bitmap including embedded data;
substituting a section of the frequency domain representation of the largest stable region with the bitmap including embedded data to create a modified frequency domain representation; and
performing a reverse transform function on the modified frequency domain representation.
9. The method of claim 8 , wherein the transform function is a fast fourier transform (FFT) and the reverse transform function is a reverse FFT.
10. The method of claim 8 , wherein substituting the section of the frequency domain representation of the largest stable region with the bitmap including embedded data comprises substituting a bottom right corner section of the frequency domain representation of the largest stable region.
11. The method of claim 8 , wherein creating the empty bitmap comprises creating the empty bitmap that has a pixel height that is half of a pixel height of the largest stable area and a pixel length that is half of a pixel length of the largest stable area.
12. The method of claim 1 , further comprising, by the processor:
including an identifier in the region including embedded data; and
replacing the largest stable region with the region including embedded data in the cache.
13. The method of claim 1 , wherein identifying the one or more stable regions in the display frame comprises comparing the display frame with at least one previous display frame associated with the dynamic image.
14. A system for embedding data in a dynamic image of a remote session display, the system comprising:
a processor; and
a non-transitory computer-readable storage medium comprising programming instructions that are configured to cause the processor to:
receive a display frame associated with the dynamic image,
receive data to be embedded in the display frame,
identify one or more stable regions in the display frame,
upon identification of the one or more stable regions, update a cache, wherein the cache comprises a plurality of stable regions corresponding to one or more display frames associated with the dynamic image,
identify, in the cache, a largest stable region corresponding to the display frame, and
embed the data to be embedded in the largest stable region to create a region including embedded data.
15. The system of claim 14 , wherein the programming instruction further comprise instructions to cause the processor to compose a composite frame by replacing an area corresponding to the largest stable region in the display frame with the region including embedded data.
16. The system of claim 14 , wherein the programming instruction further comprise instructions to cause the processor to encrypt the data to be embedded before performing the embedding.
17. The system of claim 14 , wherein the programming instruction further comprise instructions to cause the processor to, before embedding the data to be embedded in the largest stable region:
determine whether the largest stable region already includes the data to be embedded; and
perform the embedding only if the largest stable region does not include the data to be embedded.
18. The system of claim 14 , wherein the programming instruction further comprise instructions to cause the processor to, before embedding the data to be embedding in the largest stable region:
determine whether a size of the largest stable region is less than a threshold size; and
perform the embedding in the largest stable region only if the size of the largest stable region is not less than threshold size.
19. The system of claim 18 , wherein the programming instruction further comprise instructions to cause the processor to, in response to determining that the size of the largest stable region is less than the threshold size, embed the data to be embedded in the display frame using a least significant bit algorithm.
20. The system of claim 18 , wherein the threshold size is equal to at least four times a length of the data to be embedded.
21. The system of claim 18 , wherein the programming instruction that cause the processor to perform the embedding in the largest stable region further comprise instruction to:
perform a transform function on the largest stable region to create a frequency domain representation of the largest stable region;
create an empty bitmap;
embed the data to be embedded in the empty bitmap to create a bitmap including embedded data;
substitute a section of the frequency domain representation of the largest stable region with the bitmap including embedded data to create a modified frequency domain representation; and
perform a reverse transform function on the modified frequency domain representation.
22. The system of claim 21 , wherein the transform function is a fast fourier transform (FFT) and the reverse transform function is a reverse FFT.
23. The system of claim 21 , wherein the programming instruction that cause the processor to substitute the section of the frequency domain representation of the largest stable region with the bitmap including embedded data further comprise instructions to substitute a bottom right corner section of the frequency domain representation of the largest stable region.
24. The system of claim 21 , wherein the programming instruction that cause the processor to create the empty bitmap comprise instructions to create the empty bitmap that has a pixel height that is half of a pixel height of the largest stable area and a pixel length that is half of a pixel length of the largest stable area.
25. The system of claim 14 , wherein the programming instruction further comprise instructions to cause the processor to:
include an identifier in the region including embedded data; and
replacing the largest stable region with the region including embedded data in the cache.
26. The system of claim 14 , wherein the programming instruction that cause the processor to identify the one or more stable regions in the display frame comprise instructions to compare the display frame with at least one previous display frame associated with the dynamic image.