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I need help.
How do you encrypt multiple lines of a text file?

/*********************
*Made by Jase Inc    *
*Made in 10/22/2008  *
*Boolean Cryptography*
*Using ^ operator    *
*********************/





#include <iostream>
#include <fstream>
#include <string>

using namespace std;

int main () {
    string line;


 ifstream myfile ("text.txt");


char key[65]="jaf#$%skl%#ajlf^%dlkfhasjlk@#dsgsfsfrtw";
//Key that is used during the process
 if (myfile.is_open())
  {
    while (! myfile.eof() )
    {
      getline (myfile,line);

      cout << line;





    }
    myfile.close();
 }  
 cout << endl;





ofstream m1 ("text.txt");

for (int x=0; x<27; x++)
  {
    line[x]=line[x]^key[x];

    cout << line[x];

    m1 << line [x];


    //Encrypts data and wrties to file  
}
cout << endl;



//m1 << "\nwhat is new?";
cout << endl;
m1.close();







  return 0;
} 

/*********************
*Made by Jase Inc    *
*Made in 10/22/2008  *
*Boolean Cryptography*
*Using ^ operator    *
*********************/

Edited by Nick Evan: Fixed formatting

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8 Years
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Last Post by dumparun
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Set n=0. Read your file per character xor it with your key(n). Increment n. If your key is k chars long(n=k) start again with n=0.

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There are a lot of ways you can do encryption, Just decide which way you want to proceed.. Which mode of operation you want to do. Which sequence you want to follow when you are XOR ing the data. Do you want to add any salt values to the key? Do you want to transform the key to something else? Do you want to follow any standard Algorithm?

Once you decide your strategy, just code that in C++. To start with, i will recommend you to read more on Ecnryption

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