C Programs|Examples of C program| C++ program on Encryption| Program of Encryption in C++ Linux OS| Dos OS

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C and C++ uses ^ for bit-level exclusive-OR. To encrypt a single character you can use char x=x^key; if you have a key of one byte. To encrypt a string of characters with a longer key, you can use something like to the following code in C++:

#include <iostream.h>
int main()
{
  char string[11]="A Program ";
  char key[11]="ABCDEFGHIJ";
  for(int x=0; x<10; x++)
  {
    string[x]=string[x]^key[x];
    cout<<string[x];
  }
  return 0;
}

The program encrypts each character in the string using the ^ bit operator to exclusive-OR the string value with the key value for each character.

Truth Table::

exclusive-OR,  will return true if one, and only one, of the two operators is true. The truth table is as follows:

A   B    A XOR B
T   T       F
T   F       T  
F   T       T 
F   F       F