Patent ID: 8842829

Claim:
An encrypted access codeword transmission system for use with a barrier operator system, the transmission system comprising: a transmitter; and a processor connected with said transmitter to transmit a codeword, wherein said processor is operative to: (a) form a first seed from a function code and a synchronization counter, wherein the synchronization counter is greater in length than sixteen bits and the function code comprises button information associated with a barrier operator transmitter, (b) utilize the first seed and an encryption key as inputs to a code hopping encryption process to generate a first hopping code comprising a lower group of bits and an upper group of bits; (c) combine the lower group of bits and the upper group of bits of the first hopping code to generate a checksum; (d) form a second seed from at least a portion of the first hopping code and at least a portion of the checksum; (e) utilize the second seed and a decryption key as inputs to a code hopping decryption process to obtain a second hopping code; and (f) generate the codeword from a serial number of a component of the barrier operator system and the second hopping code.