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Vigenere Tableau
Instead of mod 26 we can use another device
- ABCDEFGHIJKLMNOPQRSTUVWXYZ
A ZYXWVUTSRQPONMLKJIHGFEDCBA
B YXWVUTSRQPONMLKJIHGFEDCBAZ
C XWVUTSRQPONMLKJIHGFEDCBAZY
D WVUTSRQPONMLKJIHGFEDCBAZYX
...
- Encryption is done by: Plain text is used as the row index, the key is used as the column index to identify the ciphertext.
- Decryption is done by: Cipher text is used as the row index, the key is used as the column index to lookup the plaintext.
- Has the advantage that encryption/decryption can be done by hand. (vs trying to mod by 26.)