Patent ID: 7464265

Claim:
In a computing environment with an access client and an access server being members of a network group, a method for the access client to communicate with the access server the method comprising: communicating with an authentication server via the access server to authenticate the access client to the authentication server and establish a master security key known to the access client and the authentication server; deriving, using at least one first function, a first transient session security key based on the master security key and first liveness information; communicating with the access server using the first transient session security key; after communicating with the access server using the first transient session security key, deriving, using at least one second function, a second transient session security key based on the first transient session security key and second liveness information, the second transient session security key being derived without re-authenticating the access client to the authentication server; and communicating with the access server using the second transient session security key.