Shift Cipher Code

Shift Cipher:
Another encryption algorithm yet les powerfull than RSA is shift cipher algorithm.
And caesar cipher is a special case of shift cipher where key=3

But the code provided below works for any alphabetical word and not for symbols and no's and even Capital alphabets.

CODE:

import java.util.*;

import java.io.*;
class caesarCipher

{             

                int len;

                String pText=new String();

                String pdText=new String();

                String cText=new String();int k;

                char pTextArray[],cTextArray[],cdTextArray[],pdTextArray[];

                Scanner sc=new Scanner(System.in);

                public void getInput()

                {

                                System.out.println("Enter the plaintext to be encrypted");

                                pText=sc.nextLine();

                                System.out.println("Enter the key");

                                k=sc.nextInt();

                }

                public void enCrypt()

                {

                                len=pText.length();int i;

                                System.out.println(len);

                                pTextArray=new char[len];

                                pTextArray=pText.toCharArray();

                                cTextArray=new char[len];

                               

                                for(i=0;i<len;i++)

                                {

                                                cTextArray[i]=(char)(((((int)pTextArray[i]-97)+k)%26)+97);

                                }

                               

                                cText="";

                                for(int j=0;j<len;j++)

                                cText=cText+cTextArray[j];

                                System.out.println("The Plaintext is "+pText);

                                System.out.println("The Ciphertext is "+cText);

                }

                public void deCrypt()

                {              int i=0;

                                cdTextArray=new char[len];

                                pdTextArray=new char[len];

                                cdTextArray=cText.toCharArray();

                                for(int l=0;l<26;l++)

                                {

                                                for(i=0;i<len;i++)

                                                {             

                                                               

                                                                if(((((int)cdTextArray[i]-97)-l))<0)

                                                                {

                                                                                pdTextArray[i]=(char)(((((int)cdTextArray[i]-97)-l+26)%26)+97);

                                                                }

                                                                else

                                                                {

                                                                                pdTextArray[i]=(char)(((((int)cdTextArray[i]-97)-l)%26)+97);

                                                                }

                                                                pdText=pdText+pdTextArray[i];

                                                }

                               

                                System.out.println("The plain text is: "+pdText+" for key="+l);

                                pdText="";

                                }

                }

}

class caesarCipherTest

{

                public static void main(String args[])

                {

                                caesarCipher c=new caesarCipher();

                                c.getInput();

                                c.enCrypt();

                                c.deCrypt();

                }

}

                               

OUTPUT:

C:\Users\Administrator.Home-PC\Desktop\INS_Java>javac caesarCipherTest.java

C:\Users\Administrator.Home-PC\Desktop\INS_Java>java caesarCipherTest

Enter the plaintext to be encrypted

helloworld

Enter the key

11

10

The Plaintext is helloworld

The Ciphertext is spwwzhzcwo

The plain text is: spwwzhzcwo for key=0

The plain text is: rovvygybvn for key=1

The plain text is: qnuuxfxaum for key=2

The plain text is: pmttwewztl for key=3

The plain text is: olssvdvysk for key=4

The plain text is: nkrrucuxrj for key=5

The plain text is: mjqqtbtwqi for key=6

The plain text is: lippsasvph for key=7

The plain text is: khoorzruog for key=8

The plain text is: jgnnqyqtnf for key=9

The plain text is: ifmmpxpsme for key=10

The plain text is: helloworld for key=11

The plain text is: gdkknvnqkc for key=12

The plain text is: fcjjmumpjb for key=13

The plain text is: ebiiltloia for key=14

The plain text is: dahhksknhz for key=15

The plain text is: czggjrjmgy for key=16

The plain text is: byffiqilfx for key=17

The plain text is: axeehphkew for key=18

The plain text is: zwddgogjdv for key=19

The plain text is: yvccfnficu for key=20

The plain text is: xubbemehbt for key=21

The plain text is: wtaadldgas for key=22

The plain text is: vszzckcfzr for key=23

The plain text is: uryybjbeyq for key=24

The plain text is: tqxxaiadxp for key=25

C:\Users\Administrator.Home-PC\Desktop\INS_Java>