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Encryption.java

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import java.util.*;

import java.io.*;

import java.lang.*;

interface security {

int length = 8;

void encrypt(String s);

void decrypt(String s);

}

interface stringfun extends security {

void read();

void display(boolean encryptOperation, String s);

}

class PwdCheck implements stringfun {

String password;

Scanner sc = new Scanner(System.in);

public void encrypt(String s) {

StringBuffer sb = new StringBuffer(s);

int i = 0;

for(i=0;i<s.length();i++) {

int temp = s.charAt(i);

temp++;

char encryptChar = (char)temp;

sb.setCharAt(i, encryptChar);

}

this.password = sb.toString();

}

public void decrypt(String s) {

StringBuffer sb = new StringBuffer(s);

int i = 0;

for(i=0;i<s.length();i++) {

int temp = s.charAt(i);

temp--;

char decryptChar = (char)temp;

sb.setCharAt(i, decryptChar);

}

this.password = sb.toString();

}

public void read() {

System.out.print("Enter Password: ");

password = sc.next();

System.out.println("Password Saved.");

}

public void display(boolean b, String s) {

if(b) {

System.out.println("Encrypted Password: " + s);

}

else {

System.out.println("Decrypted Password: " + s);

}

}

}

public class Encryption {

public static void main(String[] args) {

Scanner sc = new Scanner(System.in);

System.out.println("--- Data Security ---");

int ch;

do {

System.out.println("\nEnter the operation you want to perform: ");

System.out.println("1. Encrypt Password");

System.out.println("2. Decrypt Password");

System.out.println("3. Exit");

System.out.print("Enter your choice: ");

ch = sc.nextInt();

switch(ch)

{

case 1:

PwdCheck enc = new PwdCheck();

enc.read();

enc.encrypt(enc.password);

enc.display(true, enc.password);

break;

case 2:

PwdCheck dec = new PwdCheck();

dec.read();

dec.decrypt(dec.password);

dec.display(false, dec.password);

break;

case 3:

System.out.println("Thank You.");

}

}while(ch!=3);

}

}