Steganography | Steganography algorithms implemented in C with OpenCV | Computer Vision library
kandi X-RAY | Steganography Summary
kandi X-RAY | Steganography Summary
The scope of this classroom assignment within the image processing course is to try and efficiently hide within the images, preferably without noticable visual degradation and some resistance to compression or manipulation.
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QUESTION
I have a problem. I am currently working on an project that changes image pixels. I am doing it as a web app using javascript. The problem is that when I change them using getImageData and then downloads the picture with toDataURL and link download it works. But when I then upload the image and read data with getInamgeData some of the pixels change. Where can be the problem and how can I fix it.
...ANSWER
Answered 2022-Jan-04 at 08:20I managed to fix it. The problem was that the pixels changed only when the forth value changed- the alpha channel. I suppose it is caused by gamma correction of the web browser.
QUESTION
I'm fairly new to python, and I'm trying out Steganography. I'm using the libraries Stepic and Image to try to encrypt user input messages onto any image. My script will do just fine until the very last step, the encryption onto the image. My error is, "ValueError: Unsupported pixel format: image must be RGB, RGBA, or CMYK" I can't think of anything to try so I've come here. Here is my code:
...ANSWER
Answered 2021-Aug-31 at 04:38Try converting the image to any supported format before you pass it to stepic.encode()
. An example code would be:
QUESTION
Can AWS S3 detect uploads of malicious .exe files?
What if we have an app that has an upload file function and files are uploaded to s3. What if attacker renames .exe file to .jpg file or insert a hidden file inside an image file (Steganography).
Is S3 capable of detecting this? or can this be done via bucket policy? if not, whats the solution you can recommend.
...ANSWER
Answered 2021-Jun-01 at 13:05By default, Amazon S3 does not detect malicious files. However, there are 3rd party solutions for this. For example:
https://aws.amazon.com/marketplace/pp/B089QBV2GC
In addition, there are other security best practices too:
QUESTION
I am currently working on a design of steganography system that detects a certain area in an image using several techniques (K-means, Canny edge detection) using Python and OpenCV library. I am facing a huge problem updating the image pixel values to contain my secret data in the least significant bit.
I started with finding the threshold after several calculations.
thresh = cv.adaptiveThreshold(imgray,100,cv.ADAPTIVE_THRESH_GAUSSIAN_C, cv.THRESH_BINARY_INV,11,2)
And to test the area I did the following:
...ANSWER
Answered 2021-Apr-30 at 12:13Your issue is that advanced indexing returns copies of arrays, so by doing image[thresh==0][i][j]
all the time you modify freshly created copies which are then discarded.
Let's start with some fake data
QUESTION
For a little lesson in steganography, I am appending an image to another image file like so:
...ANSWER
Answered 2021-Apr-29 at 09:52Ok got it, this is how to show the hidden image:
QUESTION
I am trying to implement a set of encode and decode steganography functions in C, where i use rand() to randomly scatter my data along an array.
I use rand to calculate a random index like so:
...ANSWER
Answered 2021-Feb-02 at 18:04No. For reproducibility using rand
(which is not exactly specified and inherently uses global state) is terrible for multiple reasons:
you might use a different compiler/system, which may use a different RNG,
you might use the same compiler, but updated to a new version, which uses a different RNG,
you might use the same compiler, same version, but with an updated
libc
, that uses a different RNG,you use the same compiler and library version, but have any other non-deterministic call order of the RNG, including but not limited to:
a) some other source of randomness,
b) user input,
c) reordering of concurrency from run-to-run, or
d) any of the above in any of the libraries that you use.
QUESTION
I have a steganography code that hiding image inside another image.
I inject a watermark into the my image through this code.
The principle is very simple.
I used the source_image
and watermark_images
for insert the watermark.
This will randomly distribute the watermark_images
.
First, scatter x and y of the watermark image using random seeds.
And then, convert source_image
to frequency area using Fast Fourier Transform.
Finally, combine the watermark_layer
with the frequency area of the source_image
.
This encoding process works perfectly well. However, there is a problem in the process of decoding.
Decoding code is collects pixels scattered by random seeds in one place on the same principle.
This is Result of decoing:
this problem, if i try to encoded image to save(cv2.imwrite) and recalled(cv2.imread), the decoding doesn't work.
If I use the encoded object as it is, there is no problem. Is the pixel damaged during the saving and recall process?
this is my full code:
...ANSWER
Answered 2021-Jan-08 at 04:43Carlos Melus have a good point.
Your code is not suitable for processing jpg images.
if you use png format, it will work out well.
QUESTION
I'm trying to make steganography with C++ using Magick++. Here is my code for now
...ANSWER
Answered 2020-Nov-28 at 12:09You're probably encountering undefined behaviour as you're not using getPixels
correctly. Please see the documentation
QUESTION
I am hiding an image inside another image (Image Steganography) by using python 3.6.8 with opencv 4.4.0.44. I am on windows 10 machine.
The algorithm I am using is as follows: I have defined a mask with zeros at the last two lowest significant bits. Then I use this mask and "bitwise and" it to make the last two bits of every pixel in the base image to zero. There are two images, one is base image which accommodates the second image (hidden image). I have made sure the size of the hidden image is at most 1/4 of the base image. I have also changed both images in gray-scale to deal with only one channel.
I have successfully embedded the image as well as extracting it, but the extracted image is very noisy, which is surprising for me as the content of the image has not changed.
...ANSWER
Answered 2020-Nov-24 at 15:21The contents of const_byte_list
are equivalent to those in all_pixels_hidden_img
, which are the secret image pixels in binary string form. Your error comes shortly after, with
QUESTION
How do I calculate the total number of pixel of an image before uploading it to the server? I'm using steganography with PHP and sometimes the number of pixel of a selected image isn't enough to contain the message to hide. I'm looking for a way in javascript or PHP to know the number of pixels in an image to avoid problems when image is processed.
...ANSWER
Answered 2020-Nov-11 at 13:40How about something like this:
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