Kalkylatorer
Text Tool

Vigenère Cipher Kalkylator

Koda och avkoda text med Vigenère-chiffret med en anpassad nyckel. Ett klassiskt polyalfabetiskt substitutionschiffer för säker meddelandekryptering.

Ange text och nyckel för att se resultatet

Krypteringsdetaljer

Koda och avkoda text med Vigenère-chiffret med en anpassad nyckel. Ett klassiskt polyalfabetiskt substitutionschiffer för säker meddelandekryptering. The Vigenère cipher is a classic encryption method used for centuries.

To encode a message, you align your plaintext with a repeating key.

To decode an encrypted message, you use the same key but shift letters backward.

Example

Plaintext: 'HELLO WORLD', Key: 'KEY' → 'RIJVS UYVJN'

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Frequently Asked Questions

The Vigenère cipher is a polyalphabetic substitution cipher that uses a keyword to shift each letter of the plaintext by varying amounts.
A good key should be long, random, and memorable. Longer keys make the cipher more secure.
Yes. This calculator preserves spaces, punctuation, numbers, and special characters.
Historically considered unbreakable, the Vigenère cipher can now be cracked with frequency analysis.
Without the key, decoding a Vigenère cipher is very difficult but possible with advanced cryptanalytic techniques.