Šta je Vigenèreova Šifra?
Besplatni online alat za Vigenèreovu šifru. Šifrirajte ili dešifrirajte tekst korištenjem Vigenèreove tablice.
Zašto koristiti Vigenèreova Šifra?
- 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
Kako koristiti Vigenèreova Šifra — Korak po korak
1
Unesite your keyword (letters only, case-insensitive).
2
Upišite your plaintext or ciphertext.
3
Odaberite encrypt or Decrypt mode.
4
Uključite autokey mode to use plaintext as key extension.
5
Enable Key Visualization to see per-character key mapping.
6
Provjerite the IC value to analyze the output statistically.
Kome je Vigenèreova Šifra najbolje namijenjen?
- učenici koji uče kriptografiju
- CTF igrači
- rješavači zagonetki
- entuzijasti kriptografije
Vigenèreova Šifra — često postavljana pitanja
Šta je 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.
Šta je 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.
Kako 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.
Spremni za korištenje Vigenèreova Šifra?
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