<?php defined('SYSPATH') or die('No direct script access.');

return array
(
  'database' => array(
    'group'     => 'default', // configuation group name
    'table'     => 'sessions', // session table name
    'gc'        => 500, // number of requests before gc is invoked
    'name'      => 'session',
    'encrypted' => TRUE, // need a key in config/encrypt.php
    'lifetime'  => DATE::HOUR, // 0 = expire when the browser close,
    'columns'   => array
    (
      'session_id'  => 'session_id', // session identifier
      'last_active' => 'last_active', // timestamp of the last activity
      'contents'    => 'contents' // serialized session data
    ),
  )
);

<?php defined('SYSPATH') or die('No direct script access.');

return array
(
  'default' => array
   (
    'key'     => 'zoMGXkU!0XmB!whYsDVSR', // secret passphrase
    'cipher'  => MCRYPT_RIJNDAEL_128, // encryption mode, one of MCRYPT_MODE_*
    'mode'    => MCRYPT_MODE_NOFB, // encryption cipher, one of the Mcrpyt cipher constants
  ),
);

<?php defined('SYSPATH') or die('No direct access allowed.');

return array
(
  'driver'       => 'orm',
  'hash_method'  => 'sha256',
  'hash_key'     => 'whYsDVSR~q0',
  'lifetime'     => Date::HOUR * 2,
  'session_type' => Session::$default,
  'session_key'  => 'auth_user',
);

Session::$default = 'database';

/**
 * Enable modules. Modules are referenced by a relative or absolute path.
 */
Kohana::modules(array(
  'database'        => MODPATH.'database',   // Database access
  'orm'             => MODPATH.'orm',        // Object Relationship Mapping
  ));