Nihilist Cipher
Encrypt and decrypt text using the Nihilist cipher. Combines a Polybius square with a keyword to produce numeric ciphertext that resists frequency analysis.
How to Use Nihilist Cipher
Enter a keyword and your plaintext or ciphertext numbers, select encrypt or decrypt mode, then click the button. The cipher uses a Polybius square keyed with your keyword.
Step-by-Step Instructions
- Enter an alphabetic keyword
- Type or paste text to encrypt (or numbers to decrypt)
- Select Encrypt or Decrypt mode
- Click the button and copy the result
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