In a wireless communication system with an air interface comprised of a plurality of bursts, a communication device (102) receives a burst (200). The burst comprises payload (206, 208), a first indicator (202) and a second indicator (204). Upon receipt of the burst, the communication device determines a value of the first indicator to determine whether end-to-end encryption is applied to at least a portion of the payload, and determines a value of the second indicator to determine whether air interface encryption is applied to at least a portion of the payload.