Timeline for Crypt-analysis for finding information hidden in images?
Current License: CC BY-SA 4.0
13 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Sep 25, 2021 at 2:55 | vote | accept | John Sohn | ||
| Aug 25, 2021 at 23:38 | comment | added | John Sohn | using some statistical analysis correct ? see though the issue I see is how does a computer program differentiate between aberration, damage, or editing by a human ? A human eye can see what I'm talking about by looking closely but on different colored images with lots of noise, its very difficult to see at 1 bit data per 3-color tuple. | |
| Aug 25, 2021 at 14:45 | comment | added | ShAr | The image is stored as a bit matrix of colors(each entry of the matrix represents the grade of color of the corresponding pixel, the msg is hidden in there). Now if someone scales the msg, rotate, change resolution? the inserted msg will be scattered and will affect the pixels of the image & thus be revealed. Check the book in the answer for examples. | |
| Aug 25, 2021 at 12:41 | comment | added | John Sohn | This however doesn't actually answer the question as to how to discover that ciphertext is hidden. But it does give an example of how. | |
| Aug 24, 2021 at 23:32 | comment | added | John Sohn | oh and i meant studying the theory behind CNN's (convolutional neural networks) has been a confusion reattempt since i'm not quite that focused of late. | |
| Aug 24, 2021 at 21:26 | comment | added | John Sohn | Delivery has something to do with it for sure. Enciphering would occur prior to tagging the image. | |
| Aug 24, 2021 at 21:25 | comment | added | John Sohn | yes I realize that that was more simplistic than what you were likely talking about since anything including huffman is general complex :P ish. however its what people are looking for which forms another part. sure if you post an image from a suspected account someone might inspect that, but the question is how would you find it in an automated fashion ? I don't think a bit difference makes much of a difference visually btw. you couldn't hide MUCH info in a single image, but you could hide some. | |
| Aug 23, 2021 at 4:28 | comment | added | ShAr | What CNN & media study has to do with Cryptography?! & I think I mentioned in my reply that these simplest 1st thought approaches become revealed with any change in scale or rotation or....in the image | |
| Aug 23, 2021 at 1:46 | vote | accept | John Sohn | ||
| Aug 25, 2021 at 12:41 | |||||
| Aug 23, 2021 at 1:45 | comment | added | John Sohn | As a POC I divided ciphertext up among the color components lowest sig 3 bits and spaced them out. At 3 bit changes, it is barely visible as different. Thanks for the quick reply ! | |
| Aug 23, 2021 at 1:44 | comment | added | John Sohn | I like this subject better than studying cnn's which loses me ! | |
| Aug 22, 2021 at 12:22 | history | edited | ShAr | CC BY-SA 4.0 |
omitting a reference to a paper of mine, to not personalize the answer; and it is not necessary or mandatory
|
| Aug 22, 2021 at 12:09 | history | answered | ShAr | CC BY-SA 4.0 |