Cryptography : Railfence Cipher

Cryptography : Railfence Cipher

  1:00 PM    mayuravaani

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Railfence Cipher

Sample java code for Railfence Cipher

Key = 2
Encryption

//key=2
import java.util.Scanner;
public class Railfence_encry{
    public static void main(String args[]){
        Scanner myscanner =new Scanner(System.in);
        System.out.println("Enter the plaintext");
        String word=myscanner.nextLine().replace(" ","");
        System.out.println("cipher text");
        
        for(int i=0;i<word.length();i++){
            char a=word.charAt(i);
            if(i%2==0){
                System.out.print(a);
            }
        }
        

        for(int i=0;i<word.length();i++){
            char a=word.charAt(i);
            if(i%2==1){
                System.out.print(a);
            }
        }
        System.out.println();
    }
}

output of the above code

Decryption

//key=2
import java.util.*;
public class Railfence_decry{
    public static void main(String args[]){
        Scanner myscanner =new Scanner(System.in);
        System.out.println("Enter the cipher text");
        String word=myscanner.nextLine().replace(" ","");
        System.out.println("original message");
        char[] array1;
char[] array2;
array1=new char[word.length()];
array2=new char[word.length()];
if(word.length()%2==1){
for(int i=0;i<=(word.length()-1)/2;i++){
array1[i]=word.charAt(i);
}
int j=0;
for(int i=(word.length()-1)/2+1;i<=word.length()-1;i++){
array2[j]=word.charAt(i);
j++;
}
for(int i=0;i<word.length();i++){
if(i<=(word.length()+1)/2){
System.out.print(array1[i]);
}
if(i<=(word.length()-1)/2){
System.out.print(array2[i]);
}
}
        
}
else{
for(int i=0;i<=(word.length()/2)-1;i++){
array1[i]=word.charAt(i);
}
int j=0;
for(int i=word.length()/2;i<=word.length()-1;i++){
array2[j]=word.charAt(i);
j++;
}
for(int i=0;i<word.length();i++){
if(i<=word.length()/2){
System.out.print(array1[i]);
}
if(i<=word.length()/2){
System.out.print(array2[i]);
}

}
}
            
        
        System.out.println();
    }
}

output of the above code