A method and apparatus for secure communication in a digital two way radio
protocol is disclosed herein. The method includes the step of, at an
originating radio, generating at least one control value (505). The
method further includes the step of generating an encryption key based on
the at least one control value and a personal identification code at the
originating radio (510). The method further includes the steps of
encrypting data traffic with the encryption key to provide encrypted data
traffic at the originating radio (515), transmitting the at least one
control value to at least one target radio (525), and transmitting the
encrypted data traffic to the at least one target radio (530).