Passing Secure variable through URL?

Google+

1. SettingUp your Keys
   Google+ $config['encryption_key'] = "YOUR KEY";
   
2. Initializing the Class
   $this->load->library('encrypt');
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To encode use below method

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$id = '123';
$encrypted_id = $this->encrypt->encode($id);
//$url = 'www.trythis.com/site?id=' . $encrypted_id;

And to decode

//$encrypted_id = $_GET['id'];
$decrypted_id = $this->encrypt->decode($encrypted_id);