* <p>Its security mechanisms may be used to examine the transport layer
* (e.g client certificates and HTTP basic auth passwords) or to check the
* payload of a request to ensure it meets certain criteria (e.g. valid
* digital signature, freshness, replay).
* <p>Its security mechanisms may be used to examine the transport layer
* (e.g client certificates and HTTP basic auth passwords) or to check the
* payload of a request to ensure it meets certain criteria (e.g. valid
* digital signature, freshness, replay).