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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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