Example configuration:

{{{
Session::config(array('default' => array(
	'adapter' => 'Cookie',
	'strategies' => array('Hmac' => array('secret' => 'foobar'))
)));
}}}

This will configure the `HMAC` strategy to be used for all `Session` operations with the
`default` named configuration. A hash-based message authentication code (HMAC) will be
calculated for all data stored in your cookies, and will be compared to the signature
stored in your cookie data. If the two do not match, then your data has been tampered with
(or you have modified the data directly _without_ passing through the `Session` class, which
amounts to the same), then a catchable `RuntimeException` is thrown.

Please note that this strategy is very finnicky, and is so by design. If you attempt to access
or modify the stored data in any way other than through the `Session` class configured with the
`Hmac` strategy with the properly configured `secret`, then it will probably blow up.