Table 5x5 with key
The Table 5x5 with key is a substitution cipher that uses a grid to encode letters as numbers or pairs of symbols. The table uses two keys of five unique characters each to label the rows and columns of the grid. Each letter in the alphabet is placed in the grid, and each letter can be identified by its corresponding row and column labels.
Limitation the cipher uses a 25-letter alphabet and excludes the letter Q.
| 1 | 2 | 3 | 4 | 5 | |
|---|---|---|---|---|---|
| H | A | B | C | D | E |
| O | F | G | H | I | J |
| M | K | L | M | N | O |
| E | P | R | S | T | U |
| R | V | W | X | Y | Z |
Encoding
- H →
O3 - E →
H5 - L →
M2 - O →
M5
Decoding
- Split the encoded message into grid coordinates
- Look up each pair in the table using row and column keys
- Replace with the corresponding letter
Example
Input: HELLO WORLD
Encoded: O3 H5 M2 M2 M5 | R2 M5 E2 M2 H4
Decoded: hello world
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Demo
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