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Leonetienne 2022-05-22 23:22:54 +02:00
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@ -136,7 +136,7 @@ future output.
![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/output.bmp.png)
Now, let's flip than a single bit in the input: Now, let's flip a single bit in the input:
One bit flipped, and again the corresponding ciphertext: 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/input-flip.bmp.png)
@ -148,15 +148,16 @@ Let's gif them together, to better see the difference:
       
![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/output.gif)
As shown, flipping even a single bit, affects the entire ciphertext.
#### What about input longer a single block? #### What about input longer than a single block?
Input, and ciphertext: 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/input-big.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/output-big.gif)
Notice how the ciphertext doesn't change until the block containing the bitflip is reached. This is a limitation of cipher block chaining. Notice how the ciphertext doesn't change until the block containing the bitflip is reached? This is a limitation of cipher block chaining.
### What about extreme inputs? ### What about extreme inputs?
How non-transparent is the cipher with extreme inputs? Even with a super problematic key?: How non-transparent is the cipher with extreme inputs? Even with a super problematic key?: