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Question
```A company wants to transmit data over the telephone, but it
is concerned that its phones may be tapped. All of its data
is transmitted as four-digit integers. It has asked you to
write a program that will encrypt its data so that the data
four digit integer entered by the user in a prompt dialog
and encrypt it as follows: Replace each digit by (the sum
of that digit plus 7) modulus 10. Then swap the first digit
with the third, and swap the second digit with the fourth.
Then output        XHTML text that displays the encrypted
integer.```
Question Submitted By :: Amit
I also faced this Question!!     Rank Answer Posted By

Re: A company wants to transmit data over the telephone, but it is concerned that its phones may be tapped. All of its data is transmitted as four-digit integers. It has asked you to write a program that will encrypt its data so that the data may be transmitted more securely. Your script should read a four digit integer entered by the user in a prompt dialog and encrypt it as follows: Replace each digit by (the sum of that digit plus 7) modulus 10. Then swap the first digit with the third, and swap the second digit with the fourth. Then output XHTML text that displays the encrypted integer.
# 1
#include<iostream.h>
void main()
{
int n,a,b,c,d,e,f,g,h,i,j;

cout<<"enter 4 number digit";
cin>>n;

a=n%10;

b=n/10;

c=b%10;

d=b/10;

e=d%10;

f=d/10;

g=((a+a)+7)%10;

h=((c+c)+7)%10;

i=((e+e)+7)%10;

j=((f+f)+7)%10;

cout<<i<<g<<j<<h;

}

 Is This Answer Correct ? 6 Yes 21 No
Ferial Hattar

Re: A company wants to transmit data over the telephone, but it is concerned that its phones may be tapped. All of its data is transmitted as four-digit integers. It has asked you to write a program that will encrypt its data so that the data may be transmitted more securely. Your script should read a four digit integer entered by the user in a prompt dialog and encrypt it as follows: Replace each digit by (the sum of that digit plus 7) modulus 10. Then swap the first digit with the third, and swap the second digit with the fourth. Then output XHTML text that displays the encrypted integer.
# 2
import java.util.Scanner;

public class Main {

public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner myScanner=new Scanner(System.in);

boolean flag = true; //check value is 4 digit or not..
int beforeIncryption = 0;//take plain text
int temp; // for processing plain text
int incryptValue; // for storing after encryption process

//Check value is 4 digit or not
while(flag){
System.out.println("Please Enter exactly 4 digit enteger ");
beforeIncryption = myScanner.nextInt();

if( beforeIncryption-1000 >= 0 && beforeIncryption-1000
<= 8999)
flag=false;
}
temp = beforeIncryption;

int v1 , v2 , v3,v4;// v1 contain 1st digit,v2 contain 2nd
digit and so on...

//take separate digit and apply encryption process
v4=temp%10;
v4+=7;
v4%=10;

temp/=10;

v3=temp%10;
v3+=7;
v3%=10;

temp/=10;

v2=temp%10;
v2+=7;
v2%=10;

temp/=10;

v1=temp%10;
v1+=7;
v1%=10;

//swapping values 1st digit with 3rd digit and 2nd with
4th....
temp=v1;
v1=v3;
v3=temp;

temp=v2;
v2=v4;
v4=temp;

incryptValue = v1*1000 + v2*100 + v3*10 + v4*1;// combine
4 separate digit into 1 number
System.out.println("Encrypted data is
"+incryptValue);//display encryption result

//Program for decryption........

int myIncrypt;//take encrypted input from user
System.out.println("Enter encrypted data ");//prompt for user
myIncrypt=myScanner.nextInt();//take value for apply
decryption process

int dv1,dv2,dv3,dv4,decryptValue;

//separate 1 four digit number into 4 separate 1 digit number
dv4=myIncrypt%10;
myIncrypt/=10;

dv3=myIncrypt%10;
myIncrypt/=10;

dv2=myIncrypt%10;
myIncrypt/=10;

dv1=myIncrypt%10;
myIncrypt/=10;

//swap values
temp=dv1;
dv1=dv3;
dv3=temp;

temp=dv2;
dv2=dv4;
dv4=temp;

//apply decryption process
dv1+=10;
dv1-=7;
dv1%=10;

dv2+=10;
dv2-=7;
dv2%=10;

dv3+=10;
dv3-=7;
dv3%=10;

dv4+=10;
dv4-=7;
dv4%=10;

//combine result
decryptValue=dv1*1000+dv2*100+dv3*10+dv4*1;
//display result
System.out.println("decrypted data is"+decryptValue);

}

}

 Is This Answer Correct ? 4 Yes 3 No
Hafiz Waqas

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