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==mcrypt_encrypt.php==



   
  <!-- start source code -->
   
    <source lang="html4strict">
 
<?php
   $ivs = mcrypt_get_iv_size(MCRYPT_DES, MCRYPT_MODE_CBC);
   $iv = mcrypt_create_iv($ivs, MCRYPT_RAND);
   $key = "F925T";
   $message = "This is a test.";
   $enc = mcrypt_encrypt(MCRYPT_DES, $key, $message, MCRYPT_MODE_CBC, $iv);
   echo bin2hex($enc);
?>
  
  </source>
    
   


==Stronger Encryption Algorithms==



   
  <!-- start source code -->
   
    <source lang="html4strict">
 
<?php
$plaintext = "The test string";
$password = "enigma";
$iv_size = mcrypt_get_iv_size(MCRYPT_BLOWFISH, MCRYPT_MODE_ECB);
srand();
$iv = mcrypt_create_iv($iv_size, MCRYPT_RAND);
$ciphertext = mcrypt_encrypt(MCRYPT_BLOWFISH, $password, $plaintext,MCRYPT_MODE_ECB, $iv);
file_put_contents("secret_message.txt", $iv . $ciphertext);
$messagedata = file_get_contents("secret_message.txt");
$iv_size = mcrypt_get_iv_size(MCRYPT_BLOWFISH, MCRYPT_MODE_ECB);
$iv = substr($messagedata, 0, $iv_size);
$ciphertext = substr($messagedata, $iv_size);
$password = "enigma";
$plaintext = mcrypt_decrypt(MCRYPT_BLOWFISH, $password, $ciphertext,
                            MCRYPT_MODE_ECB, $iv);
?>
  
  </source>