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# Polybius Square Cipher

• Difficulty Level : Hard
• Last Updated : 24 Jul, 2018

A Polybius Square is a table that allows someone to convert letters into numbers. To make the encryption little harder, this table can be randomized and shared with the recipient. In order to fit the 26 letters of the alphabet into the 25 cells created by the table, the letters ‘i’ and ‘j’ are usually combined into a single cell. Originally there was no such problem because the ancient greek alphabet has 24 letters. A table of bigger size could be used if a language contain large number of alphabets.

Examples:

```Input :  bus
Output : 124543

Input :  geeksforgeeks
Output : 22151525432134422215152543
```

## C++

 `// CPP Program to implement polybius cipher``#include ``#include ``using` `namespace` `std;`` ` `// function to display polybius cipher text``void` `polybiusCipher(string s) {``  ``int` `row, col;`` ` `  ``// convert each character to its encrypted code``  ``for` `(``int` `i = 0; s[i]; i++) {`` ` `    ``// finding row of the table``    ``row = ``ceil``((s[i] - ``'a'``) / 5) + 1;`` ` `    ``// finding column of the table``    ``col = ((s[i] - ``'a'``) % 5) + 1;`` ` `    ``// if character is 'k'``    ``if` `(s[i] == ``'k'``) {``      ``row = row - 1;``      ``col = 5 - col + 1;``    ``}`` ` `    ``// if character is greater than 'j'``    ``else` `if` `(s[i] >= ``'j'``) {``      ``if` `(col == 1) {``        ``col = 6;``        ``row = row - 1;``      ``}``      ``col = col - 1;``    ``}``    ``cout << row << col;``  ``}`` ` `  ``cout << endl;``}`` ` `// Driver's Code``int` `main() {``  ``string s = ``"geeksforgeeks"``;``  ``polybiusCipher(s);``  ``return` `0;``}`

## Java

 `// Java Program to implement polybius cipher`` ` `class` `GFG``{``    ``// Function to display polybius``    ``// cipher text``    ``static` `void` `polybiusCipher(String s) ``    ``{``        ``int` `row, col;``         ` `        ``// convert each character ``        ``// to its encrypted code``        ``for` `(``int` `i = ``0``;i < s.length(); i++) ``        ``{``         ` `            ``// finding row of the table``            ``row = (``int``)Math.ceil((s.charAt(i) - ``'a'``) / ``5``) + ``1``;``         ` `            ``// finding column of the table``            ``col = ((s.charAt(i) - ``'a'``) % ``5``) + ``1``;``         ` `            ``// if character is 'k'``            ``if` `(s.charAt(i) == ``'k'``) ``            ``{``                ``row = row - ``1``;``                ``col = ``5` `- col + ``1``;``            ``}``         ` `            ``// if character is greater than 'j'``            ``else` `if` `(s.charAt(i) >= ``'j'``)``            ``{``                ``if` `(col == ``1``) ``                ``{``                    ``col = ``6``;``                    ``row = row - ``1``;``                ``}``                ``col = col - ``1``;``            ``}``            ``System.out.print(row +``""``+ col);``        ``}``         ` `        ``System.out.println();``    ``}``     ` `    ``// Driver code``    ``public` `static` `void` `main (String[] args)``    ``{``        ``String s = ``"geeksforgeeks"``;``        ``polybiusCipher(s);``    ``}``}`` ` `// This code is contributed by Anant Agarwal.`

## Python

 `# Python Program to implement polybius cipher`` ` `# function to display polybius cipher text``def` `polybiusCipher(s):`` ` `        ``# convert each character to its encrypted code``        ``for` `char ``in` `s:``             ` `                ``# finding row of the table``                ``row ``=` `int``((``ord``(char) ``-` `ord``(``'a'``)) ``/` `5``) ``+` `1``         ` `                ``# finding column of the table ``                ``col ``=` `((``ord``(char) ``-` `ord``(``'a'``)) ``%` `5``) ``+` `1`` ` `                ``# if character is 'k'``                ``if` `char ``=``=` `'k'``:``                        ``row ``=` `row ``-` `1``                        ``col ``=` `5` `-` `col ``+` `1``                         ` `                ``# if character is greater than 'j'``                ``elif` `ord``(char) >``=` `ord``(``'j'``):``                        ``if` `col ``=``=` `1` `:``                            ``col ``=` `6``                            ``row ``=` `row ``-` `1``                             ` `                        ``col ``=` `col ``-` `1``                         ` `                ``print``(row, col, end ``=``'``', sep ='``')`` ` `# Driver's Code``if` `__name__ ``=``=` `"__main__"``:`` ` `        ``s ``=` `"geeksforgeeks"`` ` `        ``# print the cipher of "geeksforgeeks"``        ``polybiusCipher(s)`

## C#

 `// C# Program to implement``// polybius cipher``using` `System;`` ` `class` `GFG``{``    ``// Function to display ``    ``// polybius cipher text``    ``static` `void` `polybiusCipher(``string` `s) ``    ``{``        ``int` `row, col;``         ` `        ``// convert each character ``        ``// to its encrypted code``        ``for` `(``int` `i = 0;``                 ``i < s.Length; i++) ``        ``{``            ``// finding row of the table``            ``row = (``int``)Math.Floor((s[i] - ``                         ``'a'``) / 5.0) + 1;``             ` `            ``// finding column``            ``// of the table``            ``col = ((s[i] - ``'a'``) % 5) + 1;``         ` `            ``// if character is 'k'``            ``if` `(s[i] == ``'k'``) ``            ``{``                ``row = row - 1;``                ``col = 5 - col + 1;``            ``}``         ` `            ``// if character is ``            ``// greater than 'j'``            ``else` `if` `(s[i] >= ``'j'``)``            ``{``                ``if` `(col == 1) ``                ``{``                    ``col = 6;``                    ``row = row - 1;``                ``}``                ``col = col - 1;``            ``}``            ``Console.Write(row + ``                          ``""` `+ col);``        ``}``        ``Console.WriteLine();``    ``}``     ` `    ``// Driver code``    ``static` `void` `Main ()``    ``{``        ``string` `s = ``"geeksforgeeks"``;``        ``polybiusCipher(s);``    ``}``} `` ` `// This code is contributed by ``// Manish Shaw(manishshaw1)`

## PHP

 `= ``'j'``)``    ``{``        ``if` `(``\$col` `== 1) ``        ``{``            ``\$col` `= 6;``            ``\$row` `= ``\$row` `- 1;``        ``}``        ``\$col` `= ``\$col` `- 1;``    ``}``    ``echo` `(``\$row``.``\$col``);``} ``echo` `(``"\n"``);``}`` ` `// Driver Code``\$s` `= ``"geeksforgeeks"``;``polybiusCipher(``\$s``);`` ` `// This code is contributed by ``// Manish Shaw(manishshaw1)``?>`

Output:

```22151525432134422215152543
```

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