Write a program of Transposition Cipher

import java.io.*;

public class ColumnTransSender

{

            String columns1[]={"","","","",""};

           

            public static void main(String s[])

            {

                        String columns[]={"","","","",""};

                        String key="21403";

                        String msg = "My name is Shreyansh";

                        String result = "";

                        int i;

                        for(i = 0; i < msg.length(); i++)

                                     columns[i % key.length()] += msg.charAt(i);

                        for(i=i%key.length();i<key.length();i++)

                                    columns[i] += "a";

                        for(i = 0; i < key.length(); i++)

                                    System.out.println("Data is : " +  columns[i]);

                                   

                        for(i = 0; i < key.length(); i++)

                        {

                                    result += columns[Integer.parseInt(""+key.charAt(i))];

                        }

                                   

                        System.out.println("Data in Result : " + result);

                        ColumnTransSender d = new ColumnTransSender();

                        d.decrypt(result,key);

            }

           

            public void decrypt(String result,String key)

            {          int i=0;

                        for(int j = 0; j<key.length();j++,i+=Integer.parseInt(""+result.length()/key.length()))

                        {

                                     columns1[Integer.parseInt(""+key.charAt(j))] += result.substring(i,i+Integer.parseInt(""+result.length()/key.length()));

                        }

                       

                                     

                        for( i = 0; i < columns1.length; i++)

                                    System.out.println("Data in again : " +  columns1[i]);

            }

}