Что такое Шифр Виженера?
Бесплатный онлайн-инструмент шифра Виженера. Шифруйте или дешифруйте текст с помощью таблицы Виженера.
Бесплатный онлайн-инструмент шифра Виженера. Шифруйте или дешифруйте текст с помощью таблицы Виженера.
Введите your keyword (letters only, case-insensitive).
Введите your plaintext or ciphertext.
Выберите encrypt or Decrypt mode.
Включите autokey mode to use plaintext as key extension.
Enable Key Visualization to see per-character key mapping.
Проверьте the IC value to analyze the output statistically.
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.
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.
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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