CiviSync CMS allows the administrators to manage the Site Key of CiviCRM and API Keys for the users from an easy to use interface within your Content Management System (CMS). CiviSync CMS is available for Drupal 6.
What is a Site Key?
You are required to pass authentication information at runtime to prevent any scripts in CiviCRM from being invoked by an unauthorized agent. CiviCRM uses a Site Key in addition to a valid username and password. The site key is a 16-32 bit alphanumeric/punctuation key value. Also, the site key should not contain any reserved or unsafe URL characters.
What is API Key?
In order to use the REST API a user is required to have an API Key stored in the database. This API Key is to be passed to civicrm with each transaction together with the username and password of the user.