¿Qué es Cifrado Vigenère?
Herramienta de cifrado Vigenère gratuita en línea. Cifra o descifra texto usando la tabla de cifrado Vigenère.
¿Por qué usar Cifrado Vigenère?
- Keyword-based polyalphabetic encryption and decryption
- Autokey mode for stronger encryption
- Character-by-character key visualization
- Index of Coincidence (IC) statistical analysis
- Random secure key generator using crypto.getRandomValues
- Key space up to 26^n for an n-letter keyword
Cómo usar Cifrado Vigenère — Paso a paso
1
Enter your keyword (letters only, case-insensitive).
2
Type your plaintext or ciphertext.
3
Choose Encrypt or Decrypt mode.
4
Toggle Autokey mode to use plaintext as key extension.
5
Enable Key Visualization to see per-character key mapping.
6
Check the IC value to analyze the output statistically.
¿Para quién es Cifrado Vigenère?
- students learning cryptography
- CTF players
- puzzle solvers
- cryptography enthusiasts
Cifrado Vigenère — Preguntas frecuentes
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.
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