E ncryption: Write a program in Python or C++ that has TWO functions: Function O

Question

Encryption:

Write a program in Python or C++ that has TWO functions:

Function One is called: _encrypt

Function Two is called: _decrypt

Function one takes plain text, and assesses the indexed value of each letter in the string. For example, a=1, b=2. It then adds three to the indexed value, and produces encrypted text, based off of the plain text.

Function two reverses this.

Here is sample output:

_encrypt('how do you do')

Unsecured: howdoyoudo

Secured: lsahscsyhs

_decrypt('lsahscsyhs')

Unsecured: lsahscsyhs

Secured: howdoyoudo

Explanation / Answer

#include <iostream >
using std :: cout;
using std :: endl;
void encrypt( char [ ] ); // prototypes of functions used in the code
void decrypt( char * ePtr );
int main( )
{
// create a string to encrypt
char string[ ] = "how do you do";
cout << "Original string is: " << string << endl;
encrypt( string );
// call to the function encrypt( )
cout << "Encrypted string is: " << string << endl;
decrypt( string );
// call to the function decrypt( )
cout << "Decrypted string is: " << string << endl;
return 0;
}// main

//encrypt data
void encrypt (char e[] )
{
for( int i=0; e[i] != ''; ++i ) ++e[i];
} // encrypt

//decrypt data
void decrypt( char * ePtr ) {
for( ; * ePtr != ''; ++* ePtr ) --(* ePtr);
}

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