Hill cipher cryptosystem is a linear algebra‐based classical polygraphic substitution cipher‐based technique. If the encryption key matrix (also called the key matrix) is not invertible, obtaining the ...
- **Step 1:** Introduce a key. - **Step 2:** Select a tab `Encrypt` or `Decrypt`. - **Step 3:** Introduce a message to encrypt or decrypt. - Verify using `Tabula Recta` (the classical Vigenère cipher ...
Each letter in the input text is shifted by a certain number (the key) through the alphabet. Non-alphabet characters remain unchanged.
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