leonetienne/GCrypt
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Add new visualizations

Browse Source
This commit is contained in:
Leonetienne
2022-05-26 18:59:59 +02:00
parent cad96a19a2
commit 849d34613e
52 changed files with 80 additions and 14 deletions
Download Patch File Download Diff File Expand all files Collapse all files

43
readme.md
View File

@@ -131,31 +131,30 @@ future output.
#### Single-block diffusion
`"Hello :3"` in binary, and it's ciphertext:
!["Hello :3" in binary](https://gitea.leonetienne.de/leonetienne/GCrypt/raw/branch/feature/relaunch/GCryptLib/visualizations/input.bmp.png)
!["Hello :3" in binary](https://gitea.leonetienne.de/leonetienne/GCrypt/raw/branch/feature/relaunch/GCryptLib/visualizations/visualize-singleblock-diffusion-input.bmp.png)
   
![Ciphertext 1](https://gitea.leonetienne.de/leonetienne/GCrypt/raw/branch/feature/relaunch/GCryptLib/visualizations/output.bmp.png)
![Ciphertext 1](https://gitea.leonetienne.de/leonetienne/GCrypt/raw/branch/feature/relaunch/GCryptLib/visualizations/visualize-singleblock-diffusion-output.bmp.png)
Now, let's flip a single bit in the input:
One bit flipped, and again the corresponding ciphertext:
![One bit flipped](https://gitea.leonetienne.de/leonetienne/GCrypt/raw/branch/feature/relaunch/GCryptLib/visualizations/input-flip.bmp.png)
![One bit flipped](https://gitea.leonetienne.de/leonetienne/GCrypt/raw/branch/feature/relaunch/GCryptLib/visualizations/visualize-singleblock-diffusion-input-flip.bmp.png)
   
![Ciphertext for flipped bit](https://gitea.leonetienne.de/leonetienne/GCrypt/raw/branch/feature/relaunch/GCryptLib/visualizations/output-flip.bmp.png)
![Ciphertext for flipped bit](https://gitea.leonetienne.de/leonetienne/GCrypt/raw/branch/feature/relaunch/GCryptLib/visualizations/visualize-singleblock-diffusion-output-flip.bmp.png)
Let's gif them together, to better see the difference:
![Input](https://gitea.leonetienne.de/leonetienne/GCrypt/raw/branch/feature/relaunch/GCryptLib/visualizations/input.gif)
![Input](https://gitea.leonetienne.de/leonetienne/GCrypt/raw/branch/feature/relaunch/GCryptLib/visualizations/visualize-singleblock-diffusion-input.gif)
   
![Ciphertext](https://gitea.leonetienne.de/leonetienne/GCrypt/raw/branch/feature/relaunch/GCryptLib/visualizations/output.gif)
![Ciphertext](https://gitea.leonetienne.de/leonetienne/GCrypt/raw/branch/feature/relaunch/GCryptLib/visualizations/visualize-singleblock-diffusion-output.gif)
As shown, flipping even a single bit, affects the entire ciphertext.
#### What about input longer than a single block?
Input, and ciphertext:
![Input](https://gitea.leonetienne.de/leonetienne/GCrypt/raw/branch/feature/relaunch/GCryptLib/visualizations/input-big.gif)
![Input](https://gitea.leonetienne.de/leonetienne/GCrypt/raw/branch/feature/relaunch/GCryptLib/visualizations/visualize-multiblock-diffusion-input.gif)
   
![Ciphertext](https://gitea.leonetienne.de/leonetienne/GCrypt/raw/branch/feature/relaunch/GCryptLib/visualizations/output-big.gif)
![Ciphertext](https://gitea.leonetienne.de/leonetienne/GCrypt/raw/branch/feature/relaunch/GCryptLib/visualizations/visualize-multiblock-diffusion-output.gif)
Notice how the ciphertext doesn't change until the block containing the bitflip is reached? This is a limitation of cipher block chaining.
@@ -163,14 +162,30 @@ Notice how the ciphertext doesn't change until the block containing the bitflip
How non-transparent is the cipher with extreme inputs? Even with a super problematic key?:
Input, key, and ciphertext:
![Input](https://gitea.leonetienne.de/leonetienne/GCrypt/raw/branch/feature/relaunch/GCryptLib/visualizations/input-extreme.gif)
![Input](https://gitea.leonetienne.de/leonetienne/GCrypt/raw/branch/feature/relaunch/GCryptLib/visualizations/visualize-extreme-input-diffusion-input.gif)
   
![Key](https://gitea.leonetienne.de/leonetienne/GCrypt/raw/branch/feature/relaunch/GCryptLib/visualizations/input-extreme-key.bmp.png)
![Key](https://gitea.leonetienne.de/leonetienne/GCrypt/raw/branch/feature/relaunch/GCryptLib/visualizations/visualize-extreme-input-diffusion-key.bmp.png)
   
![Ciphertext](https://gitea.leonetienne.de/leonetienne/GCrypt/raw/branch/feature/relaunch/GCryptLib/visualizations/output-extreme.gif)
![Ciphertext](https://gitea.leonetienne.de/leonetienne/GCrypt/raw/branch/feature/relaunch/GCryptLib/visualizations/visualize-extreme-input-diffusion-output.gif)
Notice how even cleartexts that are almost completely uniform, with a key that is just zeores, will produce ambiguous ciphertexts.
I darkened the input gif, as to not cause disorientation by flickering.
Notice how even cleartexts that are completely uniform, with a key that is almost just zeores, will still produce ambiguous ciphertexts.
### What about the PRNG's distribution?
Check it out, here are the distributions of a few different getter-methods, some in black/white, some in grayscale, some in color.
Blackwhite - GetBit(), Grayscale - GetRandom<T>(), and Grayscale - operator():
![Input](https://gitea.leonetienne.de/leonetienne/GCrypt/raw/branch/feature/relaunch/GCryptLib/visualizations/visualize-prng-distribution-blackwhite.bmp.png)
&nbsp;&nbsp;&nbsp;
![Key](https://gitea.leonetienne.de/leonetienne/GCrypt/raw/branch/feature/relaunch/GCryptLib/visualizations/visualize-prng-distribution-getrandom-grayscale.bmp.png)
&nbsp;&nbsp;&nbsp;
![Ciphertext](https://gitea.leonetienne.de/leonetienne/GCrypt/raw/branch/feature/relaunch/GCryptLib/visualizations/visualize-prng-distribution-operator-grayscale.bmp.png)
Color - GetRandom<T>(), Color - operator(), and Color - GetBlock():
![Input](https://gitea.leonetienne.de/leonetienne/GCrypt/raw/branch/feature/relaunch/GCryptLib/visualizations/visualize-prng-distribution-getrandom-color.bmp.png)
&nbsp;&nbsp;&nbsp;
![Key](https://gitea.leonetienne.de/leonetienne/GCrypt/raw/branch/feature/relaunch/GCryptLib/visualizations/visualize-prng-distribution-operator-color.bmp.png)
&nbsp;&nbsp;&nbsp;
![Ciphertext](https://gitea.leonetienne.de/leonetienne/GCrypt/raw/branch/feature/relaunch/GCryptLib/visualizations/visualize-prng-distribution-getblock-color.bmp.png)
## Noteworthy:
* This is no fixed algorithm. Newer versions may very well be unable to decrypt ciphertexts encrypted with earlier versions.