๐ Vigenรจre Cipher
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Try out the Vigenรจre cipher, which encrypts and decrypts text by shifting each letter by an amount determined by a repeating keyword. Unlike the Caesar cipher, the shift amount varies letter by letter, making it a polyalphabetic cipher that resists simple frequency analysis. Useful for learning about the history of cryptography or just for fun with text.
How to use
- Choose "Encode" or "Decode" mode.
- Enter the text to convert and a keyword (letters only) to use for the encryption.
- The converted result appears automatically โ use "Copy" to copy it.
FAQ
How is this different from the Caesar cipher?
The Caesar cipher shifts every letter in the text by the same fixed amount, while the Vigenรจre cipher varies the shift for each letter based on the keyword โ making it harder to break.
Can the keyword include numbers or symbols?
Non-alphabetic characters in the keyword are automatically stripped out โ only the letters are used to calculate the shift amounts.
Is this a practical cipher for modern use?
No, it was already shown to be breakable in the 19th century using techniques like the Kasiski examination, and it isn't secure by modern standards. It's purely for learning about historical cryptography.