encryption issues

<?php // RAY_encrypt_decrypt.php
error_reporting(E_ALL);

// MAN PAGE: http://us.php.net/manual/en/ref.mcrypt.php

class Encryption
{
    protected $key;
    protected $eot;
    protected $ivs;
    protected $iv;

    public function __construct()
    {
        // SET KEY, DELIMITER, INITIALIZATION VECTOR - MUST BE KNOWN TO BOTH PARTS OF THE ALGORITHM
        $this->key = 'quay';
        $this->eot = '___EOT';
        $this->ivs = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_ECB);
        $this->iv  = mcrypt_create_iv($this->ivs);
    }

    public function encrypt($text)
    {
        // APPEND END OF TEXT DELIMITER
        $text .= $this->eot;

        // ENCRYPT THE DATA
        $data = mcrypt_encrypt(MCRYPT_RIJNDAEL_128, $this->key, $text, MCRYPT_MODE_ECB, $this->iv);

        // MAKE IT base64() STRING SAFE FOR STORAGE AND TRANSMISSION
        return base64_encode($data);
    }

    public function decrypt($text)
    {
        // DECODE THE DATA INTO THE BINARY ENCRYPTED STRING
        $text = base64_decode($text);

        // DECRYPT THE STRING
        $data = mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $this->key, $text, MCRYPT_MODE_ECB, $this->iv);

        // REMOVE END OF TEXT DELIMITER
        $data = explode($this->eot, $data);
        return $data[0];
    }
}

// INSTANTIATE THE CLASS
$c = new Encryption();

// INITIALIZE VARS FOR LATER USE IN THE HTML FORM
$encoded = '';
$decoded = '';

// IF ANYTHING WAS POSTED
if (!empty($_POST["clearstring"]))
{
    $encoded = $c->encrypt($_POST["clearstring"]);
    echo "<br/>{$_POST["clearstring"]} YIELDS ";
    var_dump($encoded);
}

if (!empty($_POST["cryptstring"]))
{
    $decoded = $c->decrypt($_POST["cryptstring"]);
    echo "<br/>{$_POST["cryptstring"]} YIELDS ";
    var_dump($decoded);
}

// END OF PHP - PUT UP THE FORM
?>
<form method="post">
<input name="clearstring" value="<?php echo $decoded; ?>" />
<input type="submit" value="ENCRYPT" />
<br/>
<input name="cryptstring" value="<?php echo $encoded; ?>" />
<input type="submit" value="DECRYPT" />
</form>

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