THE-ENIGMA

TABLE OF CONTENT

1. INTRODUCTION
2. PREREQUISITE
3. SAMPLE OUTPUT
4. HOW IT WORKS !
   1. STEP 1
   2. STEP 2
   3. A-ENIGMA
   4. B- BOMBE
5. OTHER FEATURES
   1. VOICE
   2. MESSAGE BOX
   3. OPENNING WEBSITE
   4. LOGIN SYSTEM
   5. ANIMATION
6. SCOPE OF IMPROVEMENT
7. CREDITS
8. REFRENCES

INTRODUCTION

ENIGMA was a Cipher Machine Used by Nazis at time of WW2
This project encrypts and decrypts the data entered by the user by using a symmetric key.
The key is based on ASCII values of certain sets of variables(DATE,TIME,INPUT).
The key changes every hour , so perpetrator have only an hour to crack the key , before it changes.
We have added various other features in our code like the voice, animation, sound,etc.

PREREQUISITE

To run our program, the user must download the espeak synthesizer used in voice feature.

HEADERS USED

#include <stdio.h> 
#include <time.h>
#include <string.h> 
#include <ctype.h> 
#include <stdlib.h> 
#include <windows.h> 
#include <conio.h> 

SAMPLE OUTPUT

ENCRYPTION

Input : Hello people
Output : lPuv+{r~⌂⌂v~

DECRYPTION

Input : lPuv+{r~⌂⌂v~
Output : Hello people

HOW IT WORKS !

STEP 1 - GET TIME

get the sum of current date and time's(HOUR's) ASCII value with help of this code
due to this code key changes every hour.

char buf[LEN];
int sum=0,i;
time_t t;
struct tm *timeStruct;
t= time(NULL);
timeStruct = localtime(&t);
strftime(buf, LEN, "%x-%I", timeStruct);
printf("\n");
printf("DATE & TIME\n");
printf("-> %s\n",buf);
printf("\n");
for(i=0;i<strlen(buf);i=i+3){
sum+=(int)buf[i]+(int)buf[i+1];}

FOR EG.

  DATE - 25/01/22
  TIME - 1800 hrs

sum value will be 402

     D    D  \ M    M  \ Y    Y
     2    5    0    1    2    2 
S1 = 50 + 53 + 48 + 49 + 50 + 50 = 300

TIME - 18:00 -> 06:00

             0    6
        S2 = 48 + 54 = 102

sum = S1 + S2 = 402

STEP 2 - CHOOSE

In this step u have to choose between 2 options

system("color 7C");
int num;
printf("CHOOSE AN OPTION \n");
printf("BY ENTERING A NUMBER\n");
printf("\n");
printf("[1] ENIGMA\n");
printf("[2] BOMBE\n");
printf("\n");
rintf("-> ");
scanf("%d",&num);

ENIGMA for ENCRYPTION
BOMBE for DECRYPTION

A - ENIGMA

STEP A.3 - INPUT

If u entered 1 you have selected encryption
So now u have input your data which has to be encrypted and the following code does that

// TAKING INPUT FROM USER---
gets(a);
for(i=0;i<100;i++){
ch1=getch();
if(ch1==13)
break;
a[i]=ch1;
printf("%c",ch1);}
a[i]='\0';

STEP A.4 - KEY

KEY is added
Making KEY is a 2 step process followed by output

1 LETTERS INTERCHANGE

First we need to determine the length of string is odd or even to determine the end point of loop

// STRING LENGTH EVEN OR ODD

if(strlen(a)%2==0){
b1=strlen(a);
} else{
b1=strlen(a)-1;
}

Here alternate elements of string are swapped

// LETTER INTERCHANGE


for(i=0;i<b1;i+=2){
   temp1=a[i];
   a[i]=a[i+1];
   a[i+1]=temp1;
}

FOR EG.

heya -> ehay

2 SETTING KEY

KEY is half of length of input subtracted by 1st digit of sum which is obtained in STEP 1.

int key;
key=strlen(a)/2-sum%10; 
      

OUTPUT

In output ASCII values of string a[] are added with key and key is incremented with every character in string

printf("\n\nENCODED MESSAGE IS : ");
for(i=0;i<strlen(a);i++){
   system("color A");
   key=key+1;
   printf("%c",a[i]+key); 
}
printf("\n\nENCRYPTION SUCESSFUL!\n\n");

FOR EG.

INPUT : AAAA
A's ASCII value = 65
So
65 65 65 65
Is converted into
66+KEY 67+KEY 68+key 69+key

this step was taken to remove possiblity of repeatation.

B - BOMBE

STEP B.3 - INPUT

If u have entered 2 you have selected decryption. Enter the Encrypted data using this code

char b[100];
scanf("%s",b);

STEP B.4 - KEY

KEY is subtracted
This is also a 2 step process followed by output

1 SETTING KEY

KEY is half of length of input subtracted by 1st digit of sum which is obtained in STEP 1.
After setting the KEY string b 's each character is decremented by it's ASCII value.
FOR EG.

INPUT : AAAA
A's ASCII value =65
So
65 65 65 65
is converted into
65-key 64-key 63-KEY 62-KEY

2 LETTERS INTERCHANGE

First we need to determine the length of string is odd or even to determine the end point of loop

// STRING LENGTH EVEN OR ODD

if(strlen(b)%2==0){
b1=strlen(b);
} else{
b1=strlen(b)-1;
}

Here alternate elements of string are swapped

// LETTER INTERCHANGE


for(i=0;i<b1;i+=2){
   temp2=b[i];
   b[i]=b[i+1];
   b[i+1]=temp2;
}

FOR EG.

heya -> ehay

OUTPUT

printf("  \nDECODED MESSAGE IS : ");
for(i=0;i<strlen(b);i++){
  system("color E");
  printf("%c",x2[i]);
}
printf("\n\nDECRYPTION SUCESSFUL!\n\n");

OTHER FEATURES

VOICE

we use espeak synthesizer for voice function here is a sample code

#include<stdio.h>
#include<windows.h>

int main() {
     system ("espeak -ven-us+f2 WE_CARE_FOR_YOUR_PRIVACY");
    return 0;
}

You select different voice from 5 male and 5 female voices by making changes in espeak -ven-us+f2
f for female and m for male
1-5 for different pitches

MESSAGE BOX

You simply put a a message box by referring this sample code

#include<stdio.h>
#include<windows.h>

int main() {
    
   MessageBox(0,"\n\n\nWE CARE FOR YOUR PRIVACY!\n\n","WELCOME",1);
      Beep(800,500);
      
    return 0;
}

Beep's frequency can be adjusted

OPENING WEBSITE

This code opens any website you want like google.com , whatsapp.com , etc...
so you can send encrypted messages from website you want !

#include<stdio.h>
#include<windows.h>
#include<conio.h>

int main() {
    
       // WEB PART------
    printf("\nDo you want to open any services? (yes/no)\n");
    printf("-> ");
    char ans[10]; int f;
    scanf("%s",ans);
    if (ans[0]=='y'&&ans[1]=='e'&&ans[2]=='s'){
        f=1;}
        else{
            f=0;
        }
        switch(f){
            case 1:
         printf("\n\nWHICH COMMUNICATION SERVICES DO YOU WANT TO OPEN?\n");
    
    char i11[100];
    scanf("%s",i11);

    
    char i12[100]="\"Start www.";
    strcat(i12,i11);
    strcat(i12,".com\"");
    system(i12);

while(!kbhit()){
        ;
    }

      break;

case 0:
        printf("\nOKAY\n");
        break;
}

    return 0;
}

LOGIN SYSTEM

we use login system by simple switch case method but , we also masked the password using the following code

void mask(char spassword[]){
char ch; int i;
for(i=0;i<50;i++){
ch=getch();
if(ch==13)
break;
spassword[i]=ch;
ch='*';
printf("%c",ch);
}
   spassword[i]='\0';
}

ANIMATION

Animation was created by hardcoding frames and running it in a finite while loop

SCOPE OF IMPROVEMENT

1. The program can be further improved by using complex algorithms, as well as complex key.
   System can be made to encrypt the data on the basis of Unicode values.
2. It also can be improved for encryption and decryption of images.
3. It can also be improved for encryption and decryption of files.
4. Key changing period can change as per convenience.

CREDITS

This project was done by
Prerna Sharma
Aditya Jambhale
Abuzer Ganjifrockwala
Ishan Bhat

REFERENCES

1. espeak
2. Beep
3. Colourful Text/Background
4. Time Function
5. Message Box