Abstract: An apparatus and method for authenticating digital data is described. The method comprises generating the digital data with a radio device that operates on a narrowband channel and associating metadata to the digital data, the metadata being unique to the digital data. Further, a predefined function is applied to both the digital data and the associated metadata to generate an authentication key, and the authentication key is transmitted for storage at a remote server via the narrowband channel. The digital data is then authenticated using the stored authentication key.

Abstract: An apparatus and method for authenticating digital data is described. The method comprises generating the digital data with a radio device that operates on a narrowband channel and associating metadata to the digital data, the metadata being unique to the digital data. Further, a predefined function is applied to both the digital data and the associated metadata to generate an authentication key, and the authentication key is transmitted for storage at a remote server via the narrowband channel. The digital data is then authenticated using the stored authentication key.

Abstract: A method for communicating end-to-end encrypted super group information is provided. Temporary address data, which identifies a temporary address on which the super group is to communicate, is transmitted from a gateway to a back-to-back communications device using a direct mode or data message. The back-to-back communications device retrieves an encryption key associated with the temporary address and uses the encryption key to decrypt super group information sent from a networked communications device on the temporary address. The back-to-back communications reverts back to its original encryption key when super group communications are terminated.