BlackBerry Limited
Enhanced cell broadcast service via secure group broadcast

Abstract:

A secure cell broadcast method entails defining a group of mobile devices, reserving a channel for the group, associating cryptographic key material with the group, notifying the mobile devices of the channel for the group, securely providing the key material to the mobile devices of the group, and broadcasting on the channel a secure broadcast message that is encrypted such that the mobile devices of the group receiving on the channel can receive and decrypt the secure broadcast message using the key material.