encrypt(암호화) 프로그래밍 c++

단순 문자열을 암호화 하기 :

// main.cpp

// encrypt

// Created by Gavin on 2013. 11. 29..

#include <iostream>

using std::cout;

using std::endl;

void encrypt(char[]);

void decrypt(char * ePtr);

int main(int argc, const char * argv[])

{

// create a string to encrypt

char string[ ] = "this is a secret!";

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;

}

//encrypt data

void encrypt (char e[] )

{

for( int i=0; e[i] != '\0'; ++i ) ++e[i];

} // encrypt

//decrypt data

void decrypt( char * ePtr ) {

for( ; * ePtr != '\0'; ++* ePtr ) --(* ePtr);

}

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