Impara
Le lettere sono codificate come coppie di coordinate in una griglia 5x5.
The Polybius square is a cipher invented by the Greek historian Polybius around 150 BCE. Letters are arranged in a 5x5 grid, and each letter is represented by its row and column numbers. Since there are 26 letters but only 25 cells, I and J share a position.
Grid: Row 1 (ABCDE), Row 2 (FGHIK), Row 3 (LMNOP), Row 4 (QRSTU), Row 5 (VWXYZ). A=11, B=12, ... I/J=24, ... Z=55
- CAT -> 13 11 44
- HELLO -> 23 15 31 31 34
- DOG -> 14 34 22
Come riconoscerlo
- Two-digit numbers representing coordinates
- First digit is row (1-5), second is column (1-5)
- I and J encode to the same value (24)
Errori comuni
- Confusing row and column order
- Forgetting I/J share a cell
- Not recognizing the 5x5 grid pattern
Soluzione passo per passo
Codifica 'CAT' con il quadrato di Polibio
- La griglia: Riga 1 = ABCDE, Riga 2 = FGHIK, Riga 3 = LMNOP, Riga 4 = QRSTU, Riga 5 = VWXYZ
- C è in Riga 1, Colonna 3 → 13
- A è in Riga 1, Colonna 1 → 11
- T è in Riga 4, Colonna 4 → 44
Risposta: 13 11 44