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[CPP]/* This Program Will Encrypt Any Type Of Text Document */

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

int main()
{
char name[30],target[30],ch,mod; //Declare
Variables
int num[100],i,option;

cout<<"Enter Your Option ";
cout<<"
1. To Encrypt The File ";
cout<<"
2. To Decrypt The File ";
cout<<"
Option : ";
cin>>option;

if(option==1)
{

cout<<"Enter The Path Of A File Which Is To Be Encrypted : ";
gets(name);

ifstream fin(name,ios::binary); //Open The
Input File In A Binary Mode
if(!fin)
{ //Show
Error
Occur If File Does Not Exist
cout<<"
Error In Openinig Of A File : "; //Or Any
Error
Occurs
return 1;
}

cout<<"
Enter The New Encrypted File Name : ";
gets(target);

ofstream fout(target,ios::binary); //Open The
OutPut File In A Binary Mode
if(!fout)
{
cout<<"
Error In Opening Of Target File : "; //Show Error
If
Any Error Occrs In Opening Of A File
return 1;
}

for(i=0;i<9;i++)
{ //Multiple
For
Loops For Storing The Numbers
num[i]=i; //In An
Array
}

for(i=14;i<31;i++) //Loops Will
Store 100 Numbers
{
num[i-5]=i; //Which Will
Encrypt The Contents Of A File
}

for(i=33;i<=68;i++) //To Avoid
The
Error Ocuur Caused By The
{ //Enter Key
,
Tab Key & Space Key
num[i-7]=i; //These
Variations In Loops Is Made
}

for(i=97;i<=122;i++)
{
num[i-35]=i;
}

while(fin)
{ //Open The
Input
File
fin.get(ch);

if(ch==EOF)break; //Exit To Loop
When End Of File

if((ch>=97) && (ch<=122))
{ //Encrypt The
Small
Letters
i=97;
mod=num[ch-i];
fout<<mod;
}

if((ch>=65) && (ch<=90))
{
i=39; //Encrypt The
Capital Letters
mod=num[ch-i]; //And Store In
An
Output File
fout<<mod;
}

if((ch>=48) && (ch<=57))
{
i=4; //Encrypt The
Numbers
mod=num[ch+i];
fout<<mod;
}

if((ch==10)||(ch==13))
{
mod=ch; //For Enter Key
fout<<mod;
}

if(ch==32)
fout<<ch; //For Space Key

if(ch==9)
fout<<ch; //For Tab Key

if((ch>=33)&&(ch<=47))
{ //For Special
Symbols
mod=ch+64;
fout<<mod;
}

if((ch>=58)&&(ch<=64))
{ //For Special
Symbols
mod=ch+54;
fout<<mod;
}

if((ch>=91)&&(ch<=96))
{
mod=ch+28; //For Special
Symbols
fout<<mod;
}

if((ch>=123)&&(ch<=126))
{
mod=ch-40; //For Special
Symbols
fout<<mod;
}
}

fin.close(); //Close The Input
File
fout.close(); //Close The
Output
File

cout<<"
Your File Is Encrypted Now........... ";
getch();
return 0;
}




/*========================================================================
=======================================*/


/* This Program Will Decrypt The Document */


if(option==2)
{
char name[30],target[30],ch,mod; //Declare
Variables
int num[100],i,flag;

cout<<"Enter The Path Of A File Name Which Is To Be Decrypted : ";
gets(name);

ifstream fin(name,ios::binary);
if(!fin) //Open The
Encryped File In A Binary Mode
{
cout<<"Error In Opening Of A File : ";
return 1; //Show
Error
If File Does Not Exist
} //Or Any
Occurs In Opening Of A File

cout<<"
Enter The New Decrypted File Name : ";
gets(target);

ofstream fout;
fout.open(target,ios::binary); //Opens The
Output File In An Binary Mode
if(!fout)
{ //Show
Error
If Any Error Occurs In Opening Of A File
cout<<"Error In Opening Of A Target File : ";
return 1;
}

for(i=0;i<9;i++)
{ //Same
Multiple For Loops For Storing The Numbers
num[i]=i; //In An
Array
}

for(i=14;i<31;i++)
{
num[i-5]=i; //Loops
Will
Store 100 Numbers
}

for(i=33;i<=68;i++) //Which
Encrypts The Document Also Decrypt It
{
num[i-7]=i;
}

while(fin)
{ //Opens The
Encryped File
fin.get(ch);
flag=0; //Turn
Off
Flag
if(ch==EOF)break;

for(i=26;i<52;i++)
{
if(ch==num[i]) //Loop For
Match The Small Letters Letters
{
mod=i+39; //If Match
Then
Put Appropriate Letter
fout<<mod; //In A OutPut
File
flag=1; break ; //Turn On
Flag And Exit The Loop
}
}

if (flag==1) continue ; //If
Flag
Is On Then Continue Outer Loop

for(i=0;i<26;i++)
{ //Loop For
Match The Capital Letters
if(ch==num[i])
{ //If Match
Then
Put Appropriate Letter
mod=i+97; //In A OutPut
File
fout<<mod;
flag=1;break; //Turn On
Flag
And Exit From This Loop
}
}

if (flag==1) continue ; //If Flag
Is
On Then Continue Outer Loop

for(i=52;i<62;i++)
{ //Loop For
Numerical Numbers
if(ch==num[i])
{
mod=i-4;
fout<<mod;
flag=1; break ;
}
}

if (flag==1) continue ;

if((ch==10)||(ch==13))
{
mod=ch; //Condition For
Enter Key
fout<<mod;
}

if(ch==32)
fout<<ch; //Condition For
Space Key

if(ch==9)
fout<<ch; //Condition For
Tab
Key

if((ch>=97)&&(ch<=111))
{
mod=ch-64; //For Special
Symbols
fout<<mod;
}

if((ch>=112)&&(ch<=118))
{
mod=ch-54; //For Special
Symbols
fout<<mod;
}

if((ch>=119)&&(ch<=124))
{
mod=ch-28; //For Special
Symbols
fout<<mod;
}

if((ch>=83)&&(ch<=86))
{ //For Special
Symbols
mod=ch+40;
fout<<mod;
}

}

fin.close(); //Close The
Encrypted
File
fout.close(); //Close Your
Original
Decrypted File

cout<<"
The File Is Being Decrypted............ ";
getch();
return 0;
}
return 0;
}[/CPP]

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