An apparatus includes a key mixing circuit to generate N groups of decryption seeds, each generated based upon a predetermined key, a transmitter address, and a predetermined start value for a packet number. An input circuit receives N encrypted packets, each including the transmitter address and one of N values for the packet number. A decryption circuit decrypts each of the N encrypted packets using one of the N groups of decryption seeds that was generated based on the one of the N values in a respective one of the N encrypted packets. The key mixing circuit generates each of the N groups of decryption seeds before the input circuit receives the respective one of the N encrypted packets of the data. The predetermined start value is initialized when the apparatus is initialized and incremented when each of the N groups of decryption seeds is generated.