Aspects of the present invention provide a gaming method, system and game controller for a game of skill. The on-chip key storage includes a dual-ported memory device which allows keys to be loaded into memory simultaneous with keys being read out of memory. When the key stream for changing the security association of the terminal device is received from the server, the terminal device updates stored key stream information after identifying at least one changed field in the key stream and performs a security policy with the server using the updated key stream information. The choice results in a reduced wobble beat.