Patent ID: 8165618

Claim:
A method for securing communications in a mobile network comprising: transmitting a first variant of a message of a first type on a first slow associated control channel (SACCH) before ciphering is started on the first SACCH; after ciphering is started on the first SACCH, transmitting a second variant of the message of the first type on the first SACCH; and subsequently transmitting the second variant of the message of the first type on the first SACCH, wherein the subsequently transmitted second variant of the message of the first type is the next transmitted message of the first type on the first SACCH; and after ciphering is started on a second SACCH, transmitting a third variant of the message of the first type on the second SACCH; and subsequently transmitting the third variant of the message of the first type on the second SACCH, wherein the subsequently transmitted third variant of the message of the first type is the next transmitted message of the first type on the second SACCH, wherein the first SACCH is a communication channel between the mobile network and a first mobile device and the second SACCH is a communication channel between the mobile network and a second mobile device.