Patent ID: 9749854
Date: 2017-08-29
CPC Classifications: H04K,H04L,H04W

Claim:
1. A method for encrypting a broadcast message of a cellular base station, the method comprising: selecting, by a processor of the cellular base station, an encryption key for the broadcast message; transmitting, by the processor, an identifier of the encryption key via the cellular base station for reception by an endpoint device that stores the encryption key corresponding to the identifier; encrypting, by the processor, the broadcast message using the encryption key to create an encrypted broadcast message, wherein the encryption key comprises a spreading sequence, wherein the encrypting the broadcast message using the encryption key to create the encrypted broadcast message comprises spreading the broadcast message over a frequency band using the encryption key, wherein the frequency band includes central carrier frequencies; and transmitting, by the processor, the encrypted broadcast message over a broadcast channel via the cellular base station that is received by the endpoint device, wherein the endpoint device despreads and decrypts the encrypted broadcast message using the encryption key, wherein, when the encrypted broadcast message is despread, an amplitude of a jamming signal on the central carrier frequencies is reduced.