Patent ID: 6496928
Filing Date: 2002-12-17
Classification: G06F,H04L,H04M,H04W

Abstract:
A method of controlling access to broadcast messages received by a plurality of mobile devices, comprising:providing selected mobile devices, of the plurality of mobile devices, with a broadcast encryption key (BEK)including a group code; encrypting the broadcast messages utilizing the BEK prior to broadcasting the broadcast messages such that the selected mobile devices having the BEK are configurable to decrypt the encrypted broadcast messages; wherein encrypting further comprises: obtaining a message specific broadcast key (MSBK) based on the BEK and message specific data, specific to the broadcast message; encrypting the broadcast message with the MSBK to obtain an encrypted broadcast message; adding the message specific data, in unencrypted form, to the encrypted broadcast message; adding a header to the encrypted broadcast message; and broadcasting the encrypted broadcast messages to the mobile device over an address and the group code associated with the BEK; providing the selected mobile devices with the group code;receiving the encrypted broadcast message on the selected mobile devices; and decrypting the encrypted broadcast messages on the selected mobile devices utilizing the BEK.