What it can do
- Apply a repeating alphabetic key
- Reverse Vigenère shifts
- Preserve a reproducible key setting
How the recipe works
Vigenère Decode
Subtract the repeated key shifts from the ciphertext letters.
Demonstration
Sample input
LXFOPVEFRNHRExpected result
ATTACKATDAWNWhen to use it
- Cryptography classes
- Puzzle solving
- Comparing classical and modern encryption
Adapt it
Change the key to the one supplied with your exercise; this operation is not a modern secure cipher.
Source and verification
Adapted from University of Oviedo: Cryptography Applications lab. The explanation and sample are written for Serialize, use synthetic or documentation-safe data, and are checked against the current operation catalogue. The workflow runs locally without an external API call.