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Vigenère Cipher Beregner

Koder og afkod tekst ved hjælp af Vigenère-chifferet med en brugerdefineret nøgle. Et klassisk polyalfabetisk substitutionschiffer til sikker meddelelseskryptering.

Indtast tekst og nøgle for at se resultatet

Krypteringsdetaljer

Koder og afkod tekst ved hjælp af Vigenère-chifferet med en brugerdefineret nøgle. Et klassisk polyalfabetisk substitutionschiffer til sikker meddelelseskryptering. 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.