Encrypt, decrypt, or break a Caesar cipher with Latin, Polish, or custom alphabets.
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Category: Text
Vigenere Cipher
Encrypt and decrypt Vigenere text with a repeating key.
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Details
About this tool
Encrypt or decrypt text with the Vigenere polyalphabetic cipher. Enter a key, choose the Latin or Polish alphabet and switch direction without retyping the message.
Only letters from the chosen alphabet consume the key. Spacing and punctuation remain in place. The cipher is historically important but is not secure by modern standards.
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Good to know
Questions people actually ask
- How does the Vigenere key work?
- Each key letter supplies a Caesar-style shift and the key repeats across letters in the message.
- Is Vigenere secure today?
- No. Repeated-key patterns can be analysed. Use standard authenticated encryption for real secrets.