Hva er Vigenère-chiffer?
Gratis online Vigenère-chifferverktøy. Krypter eller dekrypter tekst med Vigenère-chiffertabell.
Hvorfor bruke Vigenère-chiffer?
- Klassisk Vigenère-chiffer med nøkkelord
- Autokey-modus for sterkere kryptering
- Toveis chiffer — selv-invers
Slik bruker du Vigenère-chiffer — Steg for steg
1
Skriv inn teksten i inndatafeltet.
2
Skriv inn et nøkkelord.
3
Velg modus: Krypter, Dekrypter eller Autokey.
Hvem er Vigenère-chiffer best for?
- kryptografi
- sikkerhet
- utdanning
Vigenère-chiffer — Ofte stilte spørsmål
What is the advantage of Vigenère over Caesar?
Vigenère uses a keyword to apply different shifts to each letter, making it a polyalphabetic cipher. This resists simple frequency analysis because the same plaintext letter can encrypt to different ciphertext letters depending on position.
What is autokey mode?
Autokey mode uses the plaintext itself to extend the keyword. After the keyword is exhausted, the plaintext characters are used as the key for subsequent positions. This prevents the repeating pattern that makes standard Vigenère vulnerable to Kasiski examination.
How is the Index of Coincidence interpreted?
IC measures how likely two randomly selected letters are identical. For English text, IC ≈ 0.0667. For random text, IC ≈ 0.0385. A Vigenère-encrypted text with a short keyword will have IC closer to 0.0385, while a value above 0.045 suggests the text may be monoalphabetic or the keyword is very long.
Klar til å bruke Vigenère-chiffer?
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